For video footage from past you can visit the individual event pages, or go to our YouTube Channel

To filter by event category, click on the event category link in the table below or use the menu on the right.

List of Past Events

Long-lasting sensitization to color based on attention

Chia-huei Tseng

Monday, November 29, 2004, 02:00pm - 03:00pm

RuCCS, Lab of Vision Research

Copy to My Calendar (iCal) Download as iCal file
 

 It is well known that attention enables us to selectively process useful visual information in both daily life activities and lab-designed behavior tasks. To cope the variable challenges, attention is known to be short-duration and quickly reversible. But we don�t know if attention also has long-duration properties � it was never reported before probably because of the lack of a good measurement of the lasting effect.  In this talk, I will first describe an ambiguous motion display as a novel measurement of attention. The display is an isoluminant grating composed of red and green stripes alternating with a texture grating. The perceived direction of this motion sequence depends both on the attended color and on the relative saturation/salience of the composing colors, red and green.  That is, attending to an unsaturated red stripe causes it to behave�in the motion sequence�like a more saturated red stripe.  The change in motion perception is a very sensitive assay of attention.  This enabled us to discover a long-lasting sensitization based on attention. When a subject is trained for a few days, for about an hour each day, to search for an object of a particular color, sensitivity to that color is altered for weeks, and in some cases, for months.  This prolonged alteration in sensitivity is surprising and unexpected, and poses a well-defined puzzle for perceptual and neural scientists.

Chia-huei Tseng