WHAT: Joint event by ASOM and the Department of Psychology at AUB
WHO: Bas Rokers, Department of Psychology, University of Wisconsin
WHEN: March 17, 2017, 15:30-17:00
WHERE: AUB, West Hall #310


Many individuals with normal visual acuity are unable to distinguish approaching from receding motion in part of their visual field, a deficit previously referred to as a stereomotion scotoma. While prevalent, affecting over 60% of individuals, the origin of this visual deficit has remained unclear. Identifying the cause of such a deficit is interesting for two reasons. First, it sheds light on the neural mechanisms underlying visual perception, and second it will help us potentially treat such deficits. This talk identifies the basis of the perceptual deficit, showing that the inability to distinguish motion direction is due to failed integration of visual signals between the two eyes. I will argue that the deficit should be considered a prevalent but previously unrecognized agnosia specific to the perception of visual motion. I will present recent neuroimaging (fMRI) data on the neural correlates of seen and unseen motion in depth. In sum, we leverage a surprising but prevalent visual deficit, and provide a model system to study and understand sensory integration and the basis of cortical blindness.

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