Psychophysical Studies of Visual Cortical Function
Final technical rept. 1 Sep 88-31 Dec 90,
SMITH-KETTLEWELL EYE RESEARCH INST SAN FRANCISCO CA
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Our work explored a variety of research areas, all directed towards obtaining an understanding of visual cortical function using psychophysical techniques. In particular, we examined visual search, visual attention, the encoding of occluding surfaces, and color filling-in. With respect to visual search, we found a new unexpected relation between distractor number and reaction time, showing that for particular tasks, performance improved when distractor number increased. With respect to visual attention we obtained new information to support the specific hypothesis which proposed that express saccades were due to a rapid disengagement of attention from the fixation. With respect to occluded surfaces, we provided a new theoretical framework to understand the large number of new results collected, suggesting the generic view principle. Finally, with respect to color filling-in, we found evidence that such a hypothetical process can be interrupted after the presentation of a stimulus and we evaluated its spatio-temporal time course.
- Medicine and Medical Research