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Behavioral/Systems/Cognitive Vestibular Signals in Macaque Extrastriate Visual Cortex Are
 

Summary: Behavioral/Systems/Cognitive
Vestibular Signals in Macaque Extrastriate Visual Cortex Are
Functionally Appropriate for Heading Perception
Sheng Liu and Dora E. Angelaki
Department of Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
Visual and vestibular signals converge onto the dorsal medial superior temporal area (MSTd) of the macaque extrastriate visual cortex,
which is thought to be involved in multisensory heading perception for spatial navigation. Peripheral otolith information, however, is
ambiguous and cannot distinguish linear accelerations experienced during self-motion from those resulting from changes in spatial
orientation relative to gravity. Here we show that, unlike peripheral vestibular sensors but similar to lobules 9 and 10 of the cerebellar
vermis(nodulusanduvula),MSTdneuronsrespondselectivelytoheadingandnottochangesinorientationrelativetogravity.Insupport
ofaroleinheadingperception,MSTdvestibularresponsesarealsodominatedbyvelocity-liketemporaldynamics,whichmightoptimize
sensory integration with visual motion information. Unlike the cerebellar vermis, however, MSTd neurons also carry a spatial
orientation-independent rotation signal from the semicircular canals, which could be useful in compensating for the effects of head
rotation on the processing of optic flow. These findings show that vestibular signals in MSTd are appropriately processed to support a
functional role in multisensory heading perception.
Introduction
How we orient and move in the world is encoded by sensory
information from the visual and vestibular systems. The dorsal
medial superior temporal area (MSTd) of extrastriate visual cor-
tex is important for the processing of optic flow, i.e., the retinal

  

Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis

 

Collections: Biology and Medicine