The  Weizmann  Institute  of  Science
Faculty of Mathematics and Computer Science

Vision and Robotics Seminar

Dov Sagi
Department of Neurobiology, Brain Research

will speak on

Networks of human vision:
connectivity and plasticity

Practicing some visual tasks lead to a significant improvement in performance, a process termed ``perceptual learning".  Learning was shown to be specific for basic simple stimulus features such as local orientation, retinal location and eye of presentation.  The experimental results demonstrate that perceptual learning improves basic processes within the adult visual system that are involved in image segmentation. These processing stages are considered as a network of excitatory and inhibitory nodes with experience dependent lateral connections. Psychophysical results provide constraints on network architecture, stability and autonomy. Extensive training, targeted at this low level network, of subjects with visual deficiencies that are thought to be the result of abnormal development of the primary visual cortex (Amblyopia) was shown to yield significant perceptual benefits (e.g. visual acuity), pointing to a strong link between cortical development and perceptual learning.

The lecture will take place in the
Lecture Hall, Room 1, Ziskind Building
on Thursday, April 18, 2002
at noon