Periodic Reporting for period 2 - HOWPER (An open or closed process: Determining the global scheme of perception)
Reporting period: 2019-12-01 to 2021-05-31
2. Analyzing the peripheral coding scheme of human vision. Using eye tracking, near-threshold vision and simulations of retinal dynamics we have found that the while visual perception cannot be explained based on the image details or eye movements alone, it can be explained by the simulated retinal activation that is generated by the convolution of both. Part of WP2.
3. Examining the efficiency and strategies of use of an active-sensing based sensory substitution device (ASenSub). We have found that blind and blindfolded sighted participants learn and perceive through ASenSub significantly faster than previously reported with passive-sensing based devices. Their strategies resembled natural tactile and visual strategies, respectively. Part of WP5.
4. Analyzing perceptual behavior of freely moving rodents. We have found that perceptual behavior is sensitive to the available degrees of freedom in moving the sensory organs. Thus, constraining head motion results in redirecting attention from explorative to defensive mode, and compensating with larger whisker movements. Part of WP4.
5. Studying sensory processing in a rat-machine hybrid. We have found that sophisticated sensory processing, including complex interactions between whisker motion and touch, occurs already at the brainstem. Part of WP4.
6. Mimicking a fast reflex loop in a rat-machine hybrid. We have found that a closed-loop touch reflex, termed touch-induced pumping (TIP), can be generated by a simple brainstem feedback loop and the mechano-elastic properties of the sensory organ. Part of WP4.
7. Analyzing strategies of human touch. We have found that human individuals employ stereotypical tactile scanning strategies with idiosyncratic characteristics that are matched with their sensory thresholds (spatial resolution and temporal adaptation). Part of WP2.