Ali Asadollahi - Visuo-Motor Laboratory, Rayan Center for Neuroscience and Behavior, Ferdowsi University of Mashhad, Mashhad, Iran.

Attention is cognitive process of selective concentrating on important aspect of information in expense of ignoring other. Deliberate focalization on goal-related sensory inputs is a fundamental component of selective attention that enhances sensory representation in the brain. I will specifically discuss two separate sets of experiments: 1) we electrically stimulated the barn owl forebrain gaze area while recording neural responses to visual stimuli in midbrain; 2) we optogenetically stimulated feedback projections from visual area V4 to V1 while recording V1 responses to visual stimuli. I will discuss our findings about the way that top-down signal modulates responses in the lower visual areas.

Circuit mechanisms, Selective attention, Visual representation