Laboratoire Psychologie de la Perception Institut Neurosciences Cognition Université Paris Descartes Centre National de Recherche Scientifique
Home
Research
vision Vision
action Action
speech Speech
avoc AVoC
support support staff
People
Former Staff
Teaching
Publications
Ethics
Events
Practical

Calendar
Opportunities
Internships
Contracts
Platforms
Links

Baby Lab

Intranet
The equivalence of target and nontarget processing in visual search

Compared the performances of a total of 32 Ss on a forced-choice visual search task and an item recognition task. Results do not support U. Neisser's hypothesis of a preattentive stage that processes targets and nontargets differentially. In the forced-choice condition, Ss indicated which of 2 items in a visual display was a target; in item recognition, Ss determined whether or not the single item in the visual display was a target. The size of the memorized set of possible targets was varied from 1-6 items for both tasks. Latencies increased linearly with memory set size in both conditions; the slopes for forced choice and item recognition were 41.8 and 27.0 msec/item, respectively. The ratio of 1.38 between the 2 slopes was well fit by S. Sternberg's item recognition model, which predicts a ratio of 1.50. Results support the hypothesis that the identification or "standing out" of targets, as compared to "blurred" nontargets, in visual search occurs after both the encoding and memory search processes have terminated. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



PDF Link