Visual Perception of Features and Objects
Annual rept. 15 Sep 1990-14 Sep 1991
CALIFORNIA UNIV BERKELEY DEPT OF PSYCHOLOGY
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The research can be divided into work on 1 preattentive visual processing, and 2 work on visual memory and priming for previously perceived objects. Some of the main findings were as follows 1 We showed that parallel, preattentive processing of motion and orientation depends on the elements sharing the same direction of contrast. However, some cues to occlusion appears also to be available preattentively, since they can control the correspondence matching in apparent motion. Preattentive grouping can guide attention in patients with neglect even though the elements are not consciously available. 2 Token representations of two novel objects can apparently be formed in a single trial. Attention then selects one of the two for response and inhibits the other. Its memory trace may nevertheless remain available to prime or interfere with subsequent perception of the same object. Similar priming and interference effects in visual search suggest that practice and automation may also depend on specific memory traces for each display, and that these are affected by the type of perceptual processing required by the search task.