Hidden and pre-conscious, the vestibular sense does not pertain to the five traditional Aristotelian senses. Yet, it impacts human development, perception, action, and cognition. The VESTISELF Project aims at advancing the rather recently initiated development of the interdisciplinary research field of cognitive vestibular neuroscience, by systematically linking basic human vestibular physiology to the cognitive psychology of the self. We will conduct the first recordings of human vestibular responses during natural whole-body rotations using implanted depth electrodes in epileptic patients. Second, we will test whether the sense of self-location, crucial for self-consciousness, involves the vestibular system. We will investigate this in epileptic patients and healthy volunteers during experimentally induced experiences of disembodied self-location. Third, we will evaluate the sense of self after peripheral and central vestibular dysfunctions. This project should contribute to the development of more comprehensive models of self-consciousness.