Final Report Summary - CONTEXT (Assessing functional connectivity patterns within and among human visual cortical areas associated with contextual influences on visual perception)
Overview of results:
We live in a visually rich environment and this contextual richness influences visual perception. Therefore, to achieve a complete and ecologically valid picture of visual perception requires consideration of the environment in which the system performs. The objective of the project CONTEXT is to understand how the context affects visual perception, particularly perception of size, lightness and motion, and to unveil the underlying neuronal mechanisms. To achieve this goal series of behavioural (psychophysical) and functional magnetic resonance imaging (fMRI) studies are conducted. Another objective of the project concerns understanding the anomalies of the visual and other cognitive systems of patients with congenital neural disorders. Such studies have the potential to identify the genes responsible in accomplishing certain visual functions and essentially to open a new avenue of research in cognitive neuroscience. Another equally important objective of the project is ensuring the successful integration of the researcher and transferring knowledge to the host institute, country and the European Union (EU).
My studies revealed exciting results regarding the contextual influences on behavioural and cortical processing of visual stimuli. In one publication, my colleagues and I showed that the activity in primary visual cortex (V1) is correlated with perceptual grouping-dependent lightness. In another study, together with my students I have shown that perceived global form affects the localised motion signals in early visual areas, but this effect depends strongly on the area under investigation, and on attention. In another vision study, our results with my students have unveiled the neuronal underpinnings of surround suppression and summation in motion perception. In another study where my students and I investigate the neural correlates of colour perception, our preliminary results showed that we can decode the chromaticity of sinusoidal gratings that the observer saw based on the fMRI data from their occipital cortex by employing multi-voxel pattern analysis methods. In a study in collaboration with researchers from the Molecular Biology and Genetics Department and with scientists in the United States (US), we performed morphometric and functional studies of patients with malformations of occipital cortex, and another study on patients with quadrupedal locomotion.
I have presented these results in international and national conferences and in invited talks. So far during the two reporting period, I have co-authored 27 conference abstracts and I have given 21 invited talks and lectures. I have co-authored six peer-reviewed journal articles, and one book chapter. I have actively participated in dissemination activities held in my institute and elsewhere, both for scientific community and for the general public. Together with colleagues in US and in Turkey, I have organised a summer school in Brain Dynamics in 2012 and 2013. I have trained four postdoc fellows, six graduate students, one MR engineer, and more than 20 undergraduate students. In 2009, I was awarded the 'Young investigator award' by Turkish Academy of Science. In February 2013, I have been promoted to associate professor position.
Further, through license agreements with institute in US, I brought to my institute advanced magnetic resonance imaging software that substantially improve resolution and quality of images above the standard protocols. These programs are not only serving my research group, but also all researchers that use the MR facilities in my institute.
Conclusions:
I believe the project CONTEXT was a success both for its scientific objectives and for its goals to ensure re-integration of the researcher and transfer of knowledge to host institute. The scientific results have revealed previously unknown relations between perceived visual qualities such as motion, lightness and size and neuronal activity in early visual cortical areas. I have been promoted to associate professorship and obtained a stable position in my institute, which is a clear indication of the success of my integration. I have given numerous presentations both to scientific community and public in general, trained many young students and researchers. Moreover, my work attracted public attention and appeared on national media. I believe through these efforts I contributed to raising interest in brain research and neuroscience in my country.
Socio-economic impact of results:
Understanding the brain and mind is one of the final frontiers of science. Apart from its intellectual significance, a satisfactory understanding of how the brain works and gives rise to mind has the potential to directly improve people's lives. Firstly, it will improve the health of citizens:
1) scientists will be in a better position to identify the causes of neurological disorders and develop more effective diagnosis tools and treatments;
2) it will be possible to device improved brain-machine interfaces to help ease difficulties faced by patients or handicapped citizens.
Secondly the insights gained from brain research will aid in the development of intelligent autonomous devices that will be able to perform chores that are either difficult or undesirable or dangerous for humans. A better understanding of the human brain will also lead to better educational systems. These improvements will have a profound effect on people's lives, their well-being and wealth, the economy, and even global peace.
In the not so far future technological advances and our understanding of how the human brain works and gives rise to mind will likely to change the medical sciences fundamentally. Our and other researchers' findings about the surround suppression in motion perception are a simple example to this. While we have discovered the neural mechanism of this interesting phenomenon, some researchers found that the degree to which surround suppression is effective can be used as an indicative bio-marker for disorders like schizophrenia, major depression disorder, and it even correlates with IQ! This is a clear example of the short path from our laboratories to the mobile device in one's pocket as a diagnostic tool.
Award:
The Turkish Academy of Sciences (TUBA) distinguished Young Scientist Award (2009)
Publications:
Book chapter:
Maloney, L. T., Gerhard, H. E., Boyaci, H., and Doerschner, K. (2010). Surface color perception and light field estimation in 3D scenes. In L. Harris and M. Jenkins (Eds.), Vision in 3D environments (pp. 65 - 88). Cambridge, United Kingdom (UK): Cambridge University Press.
Refereed journal papers:
1. Behroozi, M., Daliri, M. R., Boyaci, H. (2011). Statistical analysis methods for the fMRI data. Basic and Clinical Neuroscience, 2(4), 67-74, http://bcn.tums.ac.ir/browse.php?a(s’ouvre dans une nouvelle fenêtre) code=A-10-1-78&sid=1&slc lang=en
2. Gulsuner, S., Tekinay, A. B., Doerschner, K., Boyaci, H., Bilguvar, K., Unal, H., Ors, A., Onat, O. E., Atalar, E., Basak, A. N., Topaloglu, H., Kansu, T., Tan, M., Tan, U., Gunel, M., Ozcelik, T. (2011). Homozygosity mapping and targeted genomic sequencing reveal the gene responsible for cerebellar hypoplasia and quadrupedal locomotion in a consanguineous kindred. Genome Research, 21, pp. 1995 - 2003, http://genome.cshlp.org/content/21/12/1995.abstract(s’ouvre dans une nouvelle fenêtre) doi:10.1101/gr.126110.111
3. Barak, T., Kwan, K. Y., Louvi, A., Demirbilek, V., Saygi, S., Tuysuz, B., Choi, M., Boyaci, H., Doerschner, K., et al. (2011). Recessive LAMC3 mutations cause malformations of occipital cortical development. Nature Genetics, published online 15 May 2011, doi:10.1038/ng.836
4. Doerschner, K., Maloney, L. T., Boyaci, H. (2010). Perceived Glossiness in High Dynamic Range Scenes. Journal of Vision, 10(9):11, 1-11, http://www.journalofvision.org/content/10/9/11.full(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.9.11
5. Boyaci, H., Fang, F., Murray, S. O., Kersten, D. (2010). Perceptual grouping-dependent lightness processing in human early visual cortex. Journal of Vision, 10(9):4, 1-12, http://www.journalofvision.org/content/10/9/4.full(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.9.4
6. Doerschner, K., Boyaci, H., Maloney, L.T. (2010). Estimating the glossiness transfer function induced by illumination change and testing its transitivity. Journal of Vision, 10(4):8, 1 - 9, http://journalofvision.org/10/4/8/(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.4.8
Refereed conference abstracts:
1. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K., Dynamic topographic connectivity profile: Application to connectivity patterns in the human basal ganglia (Abstract), submitted to the annual meeting of the Society for Neuroscience, San Diego, US, November 2013
2. Boyaci, H., Akin, B., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. Perceived global motion-dependent activity in human early visual cortex under two attentional conditions (Abstract), Submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
3. Gülban, O. F., Isik, A. I., Boyaci, H. Classification of equiluminant color gratings in the human visual cortex with multi-voxel pattern analysis: A color space-free approach [Abstract]. Submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
4. Turkozer, H. B., Pamir, Z., Boyaci H., Cortical Correlates of Motion Surround Suppression in Area MT (Abstract), submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
5. Isik, A., Gülban, O. F., Boyaci, H. Insan Görsel Korteksinde Renk Kodlanmasinin Çoklu Voksel Örüntü Analizi ile Incelenmesi (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
6. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K. Yüksek Çozünürlüklü Bütün Beyin iMRG için 12 Kanalli Kafa Bobini Kullanarak 3T'de Çok Bantli, Çok Kesitli GE-EPI Optimizasyonu (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
7. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K. Çok Bantli, Çok Kesitli GE-EPI Sekansi Kullanilarak Elde Ediilen Bütün Beyin ve Bazal Ganglia Istirahat Hali Aglari (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
8. Boyaci, H., Akin, B., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. Insan erken görsel korteksinde algilanan global harekete dayali aktivite (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
9. Turkozer, H. B., Pamir, Z., Boyaci H. Hareket algisinda çevresel baskilamanin MT (orta temporal) bölgesindeki aktivite ile iliskisi (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
10. Shen, H., Mannion, D., Lee, S., Boyaci, H., Fang, F., Kersten, D. Effect of Smooth Shape on Lightness Processing in Human Visual Cortex (Abstract). The Annual Meeting of the Vision Science Society, Naples, Florida, May 2013
11. Boyaci, P., Gilani, I., Ors, A., Gülsüner, S., Uysal, H., Bilgen, R., Doerschner, K., Boyaci, H., Ozcelik, T. Dogumsal ayna hareketi bozuklugu (AHB) hastaliginda bazal ganglionlar arasinda fonksiyonel baglanti analizi (Abstract). 2. Nörometabolik dismorfoloji sempozyumu, Istanbul, Turkey, 8 - 9 March 2013
12. Boyaci, H., Subasi, E., Kobal, M. Effect of relative total area on perceived lightness [Abstract]. 35th European Conference on Visual Perception (ECVP), Alghero, Italy, 2-6 September 2012
13. Yurdakul, A., Guneyer, D., Kumral, D., Akin, B., Boyaci, H. Farkli uzamsal dikkat sartlarinin retinotopik eslesmeye etkisinin fMRI ile incelenmesi (Abstract). Türk Manyetik Rezonans Dernegi 17. Yillik Toplantisi, Ankara, Turkey, 24 - 26 May 2012
14. Boyaci, H., Ors, A., Boyaci, P., Ozcelik, T., Uysal H., Doerschner K. Structural and functional analysis of brains of patients with congenital Mirror Movement Disorder (Abstract). Submitted to 41st Annual Meeting of the Society for Neuroscience, Washington DC, 12 - 16 November 2011
15. Doerschner, K., Ozcelik, T., Gunel, M., Serap, S., Boyaci, H. Retinotopy and white matter integrity in a patient with occipital pachygyria (Abstract). Submitted to 41st Annual Meeting of the Society for Neuroscience, Washington DC, 12 - 16 November 2011
16. Yildirim, F. and Boyaci, H. Spatial pattern of activity in primary visual cortex can be modulated by distance perception based on binocular stereo cues (Abstract). Submitted to the European Conference of Visual Perception (ECVP), 28 August - 1 September 2011, Toulouse France
17. Erten, B., Mustafaoglu, N., Boyaci, H. and Doerschner, K. Visual perceptual asymmetries can be modified via visual field deprivation in adult humans (Abstract). Submitted to the European Conference of Visual Perception (ECVP), 28 August - 1 September 2011, Toulouse France
18. Ors, A., Abaci Turk, E., Urgen, B., Boyaci, H, and Doerschner, K., iMRG ile Duyu Korteksinin islevsel Haritalamasi (Functional mapping of somatosensory cortex using fMRI) (Abstract). Turk Manyetik Rezonans Dernegi 16. Yillik Toplantisi (Turkish Magnetic Resonance Society 16th annual meeting), ?Istanbul, 19-21 May 2011
19. Yilmaz, O., Gevrekci, M., Boyaci, H. and Doerschner, K., Difuzyon Tensor Goruntulemede Super cozunurluk (super-resolution in diffusion tensor imaging) (Abstract). Turk Manyetik Rezonans Dernegi 16. Yillik Toplantisi, Istanbul, 19-21 May 2011
20. Ors, A., Doerschner, K., Gulsuner, S., Uysal, H., Bilgen, R., Ozcelik, T., and Boyaci, H. (2011). Dogumsal Ayna Hareketi Bozuklugu (AHB) Hastaliginda Beynin Fonksiyonel ve Morfolojik Analizleri (Morphological and functional analysis of brains of congenital mirror movement disorder patients) (Abstract). 10. Ulusal Sinirbilimleri Kongresi (10th National Neuroscience Conference), Istanbul, Turkiye, 9-12 April 2011
21. Boyaci, H., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. (2010). Perception of global form modulates motion responses in human early visual cortex (Abstract). 40th Annual Meeting of the Society for Neuroscience, San Diego, California, 13-17 November 2010
22. Erten, B., Boyaci, H. (2010). Do Vernier acuity thresholds depend on perceived of actual retinal eccentricity? (Abstract). 33rd European Conference on Visual Perception, Lausanne, Switzerland, 22-26 August 2010
23. Doerschner, K., Boyaci, H., Olman, C. A. (2009). Functional properties of V1 neurons coding for luminance histogram skew. European Society for Magnetic Resonance in Medicine and Biology, 26th Annual Scientific Meeting, Antalya, Turkey, 1-3 October 2009
24. Boyaci, H., Fang, F., Murray, S. O., Kersten, D. (2009) Perceptual grouping and lightness [Abstract]. Journal of Vision 9 (14). Optical Society of America Fall Vision Meeting, Seattle, Washington, 24-27 September 2009, http://www.journalofvision.org/content/9/14/(s’ouvre dans une nouvelle fenêtre)
25. Boyaci, H., Doerschner, K., Murray, S. O. (2009). Shape-dependence of a size illusion explained by spatial mapping in V1 [Abstract]. Journal of Vision, 9(8):38, 38a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/38/(s’ouvre dans une nouvelle fenêtre)
26. Runeson, E., Boyaci, H., McLaughlin, J., Osterhout, L., Murray, S. (2009). Two representations of object size in early human visual cortex [Abstract]. Journal of Vision, 9(8):37, 37a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/37/(s’ouvre dans une nouvelle fenêtre)
27. Olman, C., Boyaci, H., Schumacher, J., Fang, F., Doerschner, K. (2009). Receptive field properties of V1 neurons coding for luminance histogram skew [Abstract]. Journal of Vision, 9(8):774, 774a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/774/(s’ouvre dans une nouvelle fenêtre)
Invited talks and presentations:
1. Human Visual Perception in Complex Scenens and Related Cortical Activityö 27th European Federation of Psychology Students' Association Congress, Izmir, Turkey, 21-28 April 2013
2. Human Visual System, Middle East Technical University Computer Science Group Meeting, Ankara, Turkey, 29 March 2013
3. Insan Gorsel Korteksindeki Aktivitenin Islevsel Manyetik Rezonans Goruntuleme Teknigi ile Incelenmesi, 1. ODTU Sinirbilim Gunleri, Ankara, Turkey, 16-17 February 2013
4. Human Visual Perception and Related Cortical Activity, UNAM, Bilkent University, Ankara, 23 November 2012
5. Investigation of Neural Activity in Human Visual Cortex in Complex Scenes, Molecular Biology and Genetics Department, Bilkent University Ankara, Turkey, 26 September 2012
6. Investigation of Neural Activity in Human Visual Cortex, International Summer School And Workshop on Brain Dynamics, Marmaris, Turkey, 23-28 July 2012
7. Bilissel Süreçlerin Biyolojik Temellerinin fMR ile Görüntülenmesi. Türk Manyetik Rezonans Dernegi 17. Yillik Toplantisi, Ankara, 24-26 May 2012
8. Psikoloji ve Bilissel Bilimler: Bilissel Nörobilim. Bilkent University Cognitive Sciences Club, Ankara, 3 May 2012
9. Baglamin görsel algiya etkilerinin kortikal iliskisi, Hacettepe Üniversitesi Nörolojik Bilimler ve Psikiyatri Enstitüsü, Nörobilim Semineri, Ankara, 30 April 2012
10. Baglamda Görsel Algi ve Kortikal Islevler: Baglamin Hareket Algisina Etkileri, GEBIP 2011 Yili Degerlendirme Toplantisi, 9-11 September 2011, Izmir, Turkey
11. Neural correlates of lightness processing in early human visual cortex}, Perception of material properties workshop, Schloss Rauischholzhausen, Germany, 1 - 5 June 2011
12. Goruntuleme Genomigi (Imaging genomics), Ankara University Brain Research Center, Brain Awareness Week, 16 February 2011
13. Genomik Goruntuleme (Imaging Genomics), Gazi University Neuroscience Doctorate Program Seminar, 11 February 2011
14. Visual Perception in Context and Imaging Genomics, Koc University, PhD program seminar, 6 January 2011
15. Functional Magnetic Resonance Imaging Course in UMRAM, Bilkent University, Ankara, 17 - 19 September 2010
16. Baglamin gorsel algiya etkileri (effects of context on visual perception), Uludag University, Department of Psychology, 2009-2010 Fall Seminar Series, 8 January 2010
17. Lecture series: Functional MRI from the perspective of cognitive neuroscience, Bilkent University, Biomedical Engineering Group, 7 December 2009 - 13 January 2010, four lectures
18. Gorsel ogrenme ve hafiza (visual learning and memory), Gazi University Neurophilosophy Symposium, 11-12 December 2009, Ankara
19. Lightness and Color Perception in 3D Context, University of Washington, Department of Psychology, 23 September, 2009, Seattle, WA US
20. Prospects for Cognitive Neuroscience in Genetics, Mediterranean Medical Genetics Meeting, 28 June 2009, Ankara
21. Effects of global context on cortical processing of visual information, METU Psychology Department, 22 May 2009, Ankara
We live in a visually rich environment and this contextual richness influences visual perception. Therefore, to achieve a complete and ecologically valid picture of visual perception requires consideration of the environment in which the system performs. The objective of the project CONTEXT is to understand how the context affects visual perception, particularly perception of size, lightness and motion, and to unveil the underlying neuronal mechanisms. To achieve this goal series of behavioural (psychophysical) and functional magnetic resonance imaging (fMRI) studies are conducted. Another objective of the project concerns understanding the anomalies of the visual and other cognitive systems of patients with congenital neural disorders. Such studies have the potential to identify the genes responsible in accomplishing certain visual functions and essentially to open a new avenue of research in cognitive neuroscience. Another equally important objective of the project is ensuring the successful integration of the researcher and transferring knowledge to the host institute, country and the European Union (EU).
My studies revealed exciting results regarding the contextual influences on behavioural and cortical processing of visual stimuli. In one publication, my colleagues and I showed that the activity in primary visual cortex (V1) is correlated with perceptual grouping-dependent lightness. In another study, together with my students I have shown that perceived global form affects the localised motion signals in early visual areas, but this effect depends strongly on the area under investigation, and on attention. In another vision study, our results with my students have unveiled the neuronal underpinnings of surround suppression and summation in motion perception. In another study where my students and I investigate the neural correlates of colour perception, our preliminary results showed that we can decode the chromaticity of sinusoidal gratings that the observer saw based on the fMRI data from their occipital cortex by employing multi-voxel pattern analysis methods. In a study in collaboration with researchers from the Molecular Biology and Genetics Department and with scientists in the United States (US), we performed morphometric and functional studies of patients with malformations of occipital cortex, and another study on patients with quadrupedal locomotion.
I have presented these results in international and national conferences and in invited talks. So far during the two reporting period, I have co-authored 27 conference abstracts and I have given 21 invited talks and lectures. I have co-authored six peer-reviewed journal articles, and one book chapter. I have actively participated in dissemination activities held in my institute and elsewhere, both for scientific community and for the general public. Together with colleagues in US and in Turkey, I have organised a summer school in Brain Dynamics in 2012 and 2013. I have trained four postdoc fellows, six graduate students, one MR engineer, and more than 20 undergraduate students. In 2009, I was awarded the 'Young investigator award' by Turkish Academy of Science. In February 2013, I have been promoted to associate professor position.
Further, through license agreements with institute in US, I brought to my institute advanced magnetic resonance imaging software that substantially improve resolution and quality of images above the standard protocols. These programs are not only serving my research group, but also all researchers that use the MR facilities in my institute.
Conclusions:
I believe the project CONTEXT was a success both for its scientific objectives and for its goals to ensure re-integration of the researcher and transfer of knowledge to host institute. The scientific results have revealed previously unknown relations between perceived visual qualities such as motion, lightness and size and neuronal activity in early visual cortical areas. I have been promoted to associate professorship and obtained a stable position in my institute, which is a clear indication of the success of my integration. I have given numerous presentations both to scientific community and public in general, trained many young students and researchers. Moreover, my work attracted public attention and appeared on national media. I believe through these efforts I contributed to raising interest in brain research and neuroscience in my country.
Socio-economic impact of results:
Understanding the brain and mind is one of the final frontiers of science. Apart from its intellectual significance, a satisfactory understanding of how the brain works and gives rise to mind has the potential to directly improve people's lives. Firstly, it will improve the health of citizens:
1) scientists will be in a better position to identify the causes of neurological disorders and develop more effective diagnosis tools and treatments;
2) it will be possible to device improved brain-machine interfaces to help ease difficulties faced by patients or handicapped citizens.
Secondly the insights gained from brain research will aid in the development of intelligent autonomous devices that will be able to perform chores that are either difficult or undesirable or dangerous for humans. A better understanding of the human brain will also lead to better educational systems. These improvements will have a profound effect on people's lives, their well-being and wealth, the economy, and even global peace.
In the not so far future technological advances and our understanding of how the human brain works and gives rise to mind will likely to change the medical sciences fundamentally. Our and other researchers' findings about the surround suppression in motion perception are a simple example to this. While we have discovered the neural mechanism of this interesting phenomenon, some researchers found that the degree to which surround suppression is effective can be used as an indicative bio-marker for disorders like schizophrenia, major depression disorder, and it even correlates with IQ! This is a clear example of the short path from our laboratories to the mobile device in one's pocket as a diagnostic tool.
Award:
The Turkish Academy of Sciences (TUBA) distinguished Young Scientist Award (2009)
Publications:
Book chapter:
Maloney, L. T., Gerhard, H. E., Boyaci, H., and Doerschner, K. (2010). Surface color perception and light field estimation in 3D scenes. In L. Harris and M. Jenkins (Eds.), Vision in 3D environments (pp. 65 - 88). Cambridge, United Kingdom (UK): Cambridge University Press.
Refereed journal papers:
1. Behroozi, M., Daliri, M. R., Boyaci, H. (2011). Statistical analysis methods for the fMRI data. Basic and Clinical Neuroscience, 2(4), 67-74, http://bcn.tums.ac.ir/browse.php?a(s’ouvre dans une nouvelle fenêtre) code=A-10-1-78&sid=1&slc lang=en
2. Gulsuner, S., Tekinay, A. B., Doerschner, K., Boyaci, H., Bilguvar, K., Unal, H., Ors, A., Onat, O. E., Atalar, E., Basak, A. N., Topaloglu, H., Kansu, T., Tan, M., Tan, U., Gunel, M., Ozcelik, T. (2011). Homozygosity mapping and targeted genomic sequencing reveal the gene responsible for cerebellar hypoplasia and quadrupedal locomotion in a consanguineous kindred. Genome Research, 21, pp. 1995 - 2003, http://genome.cshlp.org/content/21/12/1995.abstract(s’ouvre dans une nouvelle fenêtre) doi:10.1101/gr.126110.111
3. Barak, T., Kwan, K. Y., Louvi, A., Demirbilek, V., Saygi, S., Tuysuz, B., Choi, M., Boyaci, H., Doerschner, K., et al. (2011). Recessive LAMC3 mutations cause malformations of occipital cortical development. Nature Genetics, published online 15 May 2011, doi:10.1038/ng.836
4. Doerschner, K., Maloney, L. T., Boyaci, H. (2010). Perceived Glossiness in High Dynamic Range Scenes. Journal of Vision, 10(9):11, 1-11, http://www.journalofvision.org/content/10/9/11.full(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.9.11
5. Boyaci, H., Fang, F., Murray, S. O., Kersten, D. (2010). Perceptual grouping-dependent lightness processing in human early visual cortex. Journal of Vision, 10(9):4, 1-12, http://www.journalofvision.org/content/10/9/4.full(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.9.4
6. Doerschner, K., Boyaci, H., Maloney, L.T. (2010). Estimating the glossiness transfer function induced by illumination change and testing its transitivity. Journal of Vision, 10(4):8, 1 - 9, http://journalofvision.org/10/4/8/(s’ouvre dans une nouvelle fenêtre) doi:10.1167/10.4.8
Refereed conference abstracts:
1. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K., Dynamic topographic connectivity profile: Application to connectivity patterns in the human basal ganglia (Abstract), submitted to the annual meeting of the Society for Neuroscience, San Diego, US, November 2013
2. Boyaci, H., Akin, B., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. Perceived global motion-dependent activity in human early visual cortex under two attentional conditions (Abstract), Submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
3. Gülban, O. F., Isik, A. I., Boyaci, H. Classification of equiluminant color gratings in the human visual cortex with multi-voxel pattern analysis: A color space-free approach [Abstract]. Submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
4. Turkozer, H. B., Pamir, Z., Boyaci H., Cortical Correlates of Motion Surround Suppression in Area MT (Abstract), submitted to 36th European Conference on Visual Perception (ECVP), Bremen, Germany, 25 - 29 August 2013
5. Isik, A., Gülban, O. F., Boyaci, H. Insan Görsel Korteksinde Renk Kodlanmasinin Çoklu Voksel Örüntü Analizi ile Incelenmesi (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
6. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K. Yüksek Çozünürlüklü Bütün Beyin iMRG için 12 Kanalli Kafa Bobini Kullanarak 3T'de Çok Bantli, Çok Kesitli GE-EPI Optimizasyonu (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
7. Gilani, I., Boyaci, P., Boyaci, H., Doerschner, K. Çok Bantli, Çok Kesitli GE-EPI Sekansi Kullanilarak Elde Ediilen Bütün Beyin ve Bazal Ganglia Istirahat Hali Aglari (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
8. Boyaci, H., Akin, B., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. Insan erken görsel korteksinde algilanan global harekete dayali aktivite (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
9. Turkozer, H. B., Pamir, Z., Boyaci H. Hareket algisinda çevresel baskilamanin MT (orta temporal) bölgesindeki aktivite ile iliskisi (Abstract). Türk Manyetik Rezonans Dernegi 18. Yillik Toplantisi, Ankara, Turkey, 23 - 25 May 2013
10. Shen, H., Mannion, D., Lee, S., Boyaci, H., Fang, F., Kersten, D. Effect of Smooth Shape on Lightness Processing in Human Visual Cortex (Abstract). The Annual Meeting of the Vision Science Society, Naples, Florida, May 2013
11. Boyaci, P., Gilani, I., Ors, A., Gülsüner, S., Uysal, H., Bilgen, R., Doerschner, K., Boyaci, H., Ozcelik, T. Dogumsal ayna hareketi bozuklugu (AHB) hastaliginda bazal ganglionlar arasinda fonksiyonel baglanti analizi (Abstract). 2. Nörometabolik dismorfoloji sempozyumu, Istanbul, Turkey, 8 - 9 March 2013
12. Boyaci, H., Subasi, E., Kobal, M. Effect of relative total area on perceived lightness [Abstract]. 35th European Conference on Visual Perception (ECVP), Alghero, Italy, 2-6 September 2012
13. Yurdakul, A., Guneyer, D., Kumral, D., Akin, B., Boyaci, H. Farkli uzamsal dikkat sartlarinin retinotopik eslesmeye etkisinin fMRI ile incelenmesi (Abstract). Türk Manyetik Rezonans Dernegi 17. Yillik Toplantisi, Ankara, Turkey, 24 - 26 May 2012
14. Boyaci, H., Ors, A., Boyaci, P., Ozcelik, T., Uysal H., Doerschner K. Structural and functional analysis of brains of patients with congenital Mirror Movement Disorder (Abstract). Submitted to 41st Annual Meeting of the Society for Neuroscience, Washington DC, 12 - 16 November 2011
15. Doerschner, K., Ozcelik, T., Gunel, M., Serap, S., Boyaci, H. Retinotopy and white matter integrity in a patient with occipital pachygyria (Abstract). Submitted to 41st Annual Meeting of the Society for Neuroscience, Washington DC, 12 - 16 November 2011
16. Yildirim, F. and Boyaci, H. Spatial pattern of activity in primary visual cortex can be modulated by distance perception based on binocular stereo cues (Abstract). Submitted to the European Conference of Visual Perception (ECVP), 28 August - 1 September 2011, Toulouse France
17. Erten, B., Mustafaoglu, N., Boyaci, H. and Doerschner, K. Visual perceptual asymmetries can be modified via visual field deprivation in adult humans (Abstract). Submitted to the European Conference of Visual Perception (ECVP), 28 August - 1 September 2011, Toulouse France
18. Ors, A., Abaci Turk, E., Urgen, B., Boyaci, H, and Doerschner, K., iMRG ile Duyu Korteksinin islevsel Haritalamasi (Functional mapping of somatosensory cortex using fMRI) (Abstract). Turk Manyetik Rezonans Dernegi 16. Yillik Toplantisi (Turkish Magnetic Resonance Society 16th annual meeting), ?Istanbul, 19-21 May 2011
19. Yilmaz, O., Gevrekci, M., Boyaci, H. and Doerschner, K., Difuzyon Tensor Goruntulemede Super cozunurluk (super-resolution in diffusion tensor imaging) (Abstract). Turk Manyetik Rezonans Dernegi 16. Yillik Toplantisi, Istanbul, 19-21 May 2011
20. Ors, A., Doerschner, K., Gulsuner, S., Uysal, H., Bilgen, R., Ozcelik, T., and Boyaci, H. (2011). Dogumsal Ayna Hareketi Bozuklugu (AHB) Hastaliginda Beynin Fonksiyonel ve Morfolojik Analizleri (Morphological and functional analysis of brains of congenital mirror movement disorder patients) (Abstract). 10. Ulusal Sinirbilimleri Kongresi (10th National Neuroscience Conference), Istanbul, Turkiye, 9-12 April 2011
21. Boyaci, H., Doerschner, K., Eroglu, S., Fang, F., Kersten, D., Ozdem, C., Taslak, D. (2010). Perception of global form modulates motion responses in human early visual cortex (Abstract). 40th Annual Meeting of the Society for Neuroscience, San Diego, California, 13-17 November 2010
22. Erten, B., Boyaci, H. (2010). Do Vernier acuity thresholds depend on perceived of actual retinal eccentricity? (Abstract). 33rd European Conference on Visual Perception, Lausanne, Switzerland, 22-26 August 2010
23. Doerschner, K., Boyaci, H., Olman, C. A. (2009). Functional properties of V1 neurons coding for luminance histogram skew. European Society for Magnetic Resonance in Medicine and Biology, 26th Annual Scientific Meeting, Antalya, Turkey, 1-3 October 2009
24. Boyaci, H., Fang, F., Murray, S. O., Kersten, D. (2009) Perceptual grouping and lightness [Abstract]. Journal of Vision 9 (14). Optical Society of America Fall Vision Meeting, Seattle, Washington, 24-27 September 2009, http://www.journalofvision.org/content/9/14/(s’ouvre dans une nouvelle fenêtre)
25. Boyaci, H., Doerschner, K., Murray, S. O. (2009). Shape-dependence of a size illusion explained by spatial mapping in V1 [Abstract]. Journal of Vision, 9(8):38, 38a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/38/(s’ouvre dans une nouvelle fenêtre)
26. Runeson, E., Boyaci, H., McLaughlin, J., Osterhout, L., Murray, S. (2009). Two representations of object size in early human visual cortex [Abstract]. Journal of Vision, 9(8):37, 37a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/37/(s’ouvre dans une nouvelle fenêtre)
27. Olman, C., Boyaci, H., Schumacher, J., Fang, F., Doerschner, K. (2009). Receptive field properties of V1 neurons coding for luminance histogram skew [Abstract]. Journal of Vision, 9(8):774, 774a. The Annual Meeting of the Vision Science Society, Naples, Florida, May 2009, http://journalofvision.org/9/8/774/(s’ouvre dans une nouvelle fenêtre)
Invited talks and presentations:
1. Human Visual Perception in Complex Scenens and Related Cortical Activityö 27th European Federation of Psychology Students' Association Congress, Izmir, Turkey, 21-28 April 2013
2. Human Visual System, Middle East Technical University Computer Science Group Meeting, Ankara, Turkey, 29 March 2013
3. Insan Gorsel Korteksindeki Aktivitenin Islevsel Manyetik Rezonans Goruntuleme Teknigi ile Incelenmesi, 1. ODTU Sinirbilim Gunleri, Ankara, Turkey, 16-17 February 2013
4. Human Visual Perception and Related Cortical Activity, UNAM, Bilkent University, Ankara, 23 November 2012
5. Investigation of Neural Activity in Human Visual Cortex in Complex Scenes, Molecular Biology and Genetics Department, Bilkent University Ankara, Turkey, 26 September 2012
6. Investigation of Neural Activity in Human Visual Cortex, International Summer School And Workshop on Brain Dynamics, Marmaris, Turkey, 23-28 July 2012
7. Bilissel Süreçlerin Biyolojik Temellerinin fMR ile Görüntülenmesi. Türk Manyetik Rezonans Dernegi 17. Yillik Toplantisi, Ankara, 24-26 May 2012
8. Psikoloji ve Bilissel Bilimler: Bilissel Nörobilim. Bilkent University Cognitive Sciences Club, Ankara, 3 May 2012
9. Baglamin görsel algiya etkilerinin kortikal iliskisi, Hacettepe Üniversitesi Nörolojik Bilimler ve Psikiyatri Enstitüsü, Nörobilim Semineri, Ankara, 30 April 2012
10. Baglamda Görsel Algi ve Kortikal Islevler: Baglamin Hareket Algisina Etkileri, GEBIP 2011 Yili Degerlendirme Toplantisi, 9-11 September 2011, Izmir, Turkey
11. Neural correlates of lightness processing in early human visual cortex}, Perception of material properties workshop, Schloss Rauischholzhausen, Germany, 1 - 5 June 2011
12. Goruntuleme Genomigi (Imaging genomics), Ankara University Brain Research Center, Brain Awareness Week, 16 February 2011
13. Genomik Goruntuleme (Imaging Genomics), Gazi University Neuroscience Doctorate Program Seminar, 11 February 2011
14. Visual Perception in Context and Imaging Genomics, Koc University, PhD program seminar, 6 January 2011
15. Functional Magnetic Resonance Imaging Course in UMRAM, Bilkent University, Ankara, 17 - 19 September 2010
16. Baglamin gorsel algiya etkileri (effects of context on visual perception), Uludag University, Department of Psychology, 2009-2010 Fall Seminar Series, 8 January 2010
17. Lecture series: Functional MRI from the perspective of cognitive neuroscience, Bilkent University, Biomedical Engineering Group, 7 December 2009 - 13 January 2010, four lectures
18. Gorsel ogrenme ve hafiza (visual learning and memory), Gazi University Neurophilosophy Symposium, 11-12 December 2009, Ankara
19. Lightness and Color Perception in 3D Context, University of Washington, Department of Psychology, 23 September, 2009, Seattle, WA US
20. Prospects for Cognitive Neuroscience in Genetics, Mediterranean Medical Genetics Meeting, 28 June 2009, Ankara
21. Effects of global context on cortical processing of visual information, METU Psychology Department, 22 May 2009, Ankara