SELF-UNITY has made substantial progress toward clarifying the cognitive processes and brain mechanisms that mediate the sense of a unitary single bodily self. In work package (WP) 1, we have developed illusion paradigms to investigate the coherent perception of an entire body as one’s own (full-body ownership) and how this experience relates to the ownership of individual body parts (body-part ownership). Our studies thus far have found that although the senses of ownership of body parts and the full body are correlated and follow similar rules, full-body ownership is more than the sum of ownership of body parts and reflects a global bodily percept. We are currently further investigating the neural mechanisms that support this unitary whole-body perceptual experience. In WP2 and WP3, we conduct behavioral and neuroimaging studies to investigate how the vestibular sense (the sense of balance) and interoception (the body’s inner sensations) contribute to the perceived coherence of the bodily self. In WP2, we have developed a novel full-body illusion paradigm, which shows that a sense of full-body ownership can be triggered solely by congruent visual and vestibular stimulation through electrical stimulation of the vestibular nerve. In ongoing studies, we are investigating how tactile and vestibular signals work together to promote a unitary bodily experience and pinpoint the active brain regions involved in this process. In WP3, we have developed several novel illusion paradigms to trigger a body ownership illusion by stimulating various interoceptive submodalities, which suggests that the input from c-fibers reaching the insular cortex plays a critical role in the bodily self-unity and bodily illusions. Finally, in WP4, a major achievement is a new “dual-body illusion,” wherein people experience two separate bodies as their own at the same time. This illusion shows that healthy people may experience ownership of two district bodies under certain conditions of multisensory perceptual ambiguity. This finding is important because it suggests that the unitary sense of a single bodily self located at a single place results from an active and dynamic multisensory integration process. We have also conducted a study in which we generalize the principles of the dual-body illusion to the case of a single body part and describe conclusive empirical evidence for the existence of a supernumerary limb illusion where people experience having two right hands, which provides further support for the general assumptions and hypothesis in this WP. In addition, we conducted several technical studies in which we improved our methods used to register changes in body ownership illusions under well-controlled conditions. Moreover, we are currently continuing to investigate the brain mechanisms of self-unity using neuroimaging techniques and the illusion paradigms described above. Collectively, the results from SELF-UNITY advance our understanding of the multisensory processes and cortical mechanisms that support the unity of bodily self and open up new horizons for empirical research into one of the most fundamental questions in cognitive and brain sciences today, that is, how we come to have a unitary experience of a single self.