Related Experiment Video
Updated: Aug 23, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
Pop-out from abrupt visual onsets
1Centre for Cognitive and Computational Neuroscience, Department of Psychology, University of Stirling, Stirling FK9 4LA, UK. pjbhl@stir.ac.uk
Abstract:
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.
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