How is self-motion encoded in the human brain
The principal visual cue to self-motion (egomotion) is optic flow. In macaques, extracting optic flow from the image in order to perceive egomotion is attributed often to cortical area MSTd and sometimes to VIP. In humans, we have argued that hMST is involved but that VIP, CSv and V6 all show greater specificity than hMST for egomotion signals (Wall et al Curr Biol 2008; Cardin & Smith Cereb Cortex 2010). I shall provide a review of this work and then describe recent fMRI experiments addressing two questions relating to these various brain regions: (i) Does the vestibular system interact with flow signals in these regions? (ii) Are stereoscopic depth cues integrated with flow signals in these regions?