Pop-out from abrupt visual onsets

We report a novel psychophysical paradigm that distinguishes the information present in abrupt stimulus onset from that in the following display. The task is to pick the one odd item from a set added to a pre-existing background of similar items. When all new items are added simultaneously, observer...

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Bibliographic Details
Published in:Vision research (Oxford) 2004-01, Vol.44 (19), p.2285-2299
Main Authors: Hancock, P.J.B, Phillips, W.A
Format: Article
Language:English
Subjects:
Abrupt visual onsets
Biological and medical sciences
Color Perception - physiology
Contrast Sensitivity - physiology
Dynamic grouping
Fundamental and applied biological sciences. Psychology
Humans
Neuropsychological Tests
Perception
Perceptual Masking
Photic Stimulation
Pop-out
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychophysics
Synchronization
Transient signals
Vision
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Description
Summary:We report a novel psychophysical paradigm that distinguishes the information present in abrupt stimulus onset from that in the following display. The task is to pick the one odd item from a set added to a pre-existing background of similar items. When all new items are added simultaneously, observers are impaired even at distinguishing one red item amongst several green ones. An asynchrony of about 40 ms between target and distracter items restores performance, with evidence that it is cortical, rather than stimulus timing difference that is significant. The results are consistent with a role for neural synchrony in dynamic grouping.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2004.04.016