Topic: The representation of hue and orientation in areas V2 and V4 of macaquemonkey visual cortex

Speaker:
        Daniel Felleman, Ph.D.
　　    Associate Professor
　　    The University of Texas Medical School
　　    U.S.A.    

Time: 2012.9.26 (Wednesday) 15:00 p.m
Place: Second floor meeting room,building 7,The Affilated Hospital of Hanzhong Normal University.

Introduction:
In this talk, I will present our current research projects that utilize optical recording of intrinsic cortical signals, microelectrode array recordings of single unit and local field potentials, and neuroanatomical pathway tracing techniques to study the processing of orientation and hue in areas V2 and V4 of macaque monkey visual cortex. Our previous work focused on the representation of hue and luminance change in V2 thin stripes. Our recent work has focused on the representation of orientation in area V2 with the resultant discovery that V2 consists of four functional compartments; thick stripes, thin stripes and two types of interstripes (type-I and type-II). Our recent work in area V4 has focused on the representation of hue and color using intrinsic cortical signals. These studies have revealed that V4 consists of partially segregated hue-preferring and orientation-preferring domains as well as domains with conjoint selectivity for both hue and orientation. Finally, our recent studies using microelectrode array recording have focused on determining how information about hue and orientation are distributed across V2 with the goal of linking neuronal signal and noise correlations to the patterns of intrinsic cortical circuits that link neurons both within and between V2 stripes.