Temporal Binding and Segmentation in Visual Search: A Computational Neuroscience Analysis

Mavritsaki, Eirini and Humphreys, Glyn (2016) Temporal Binding and Segmentation in Visual Search: A Computational Neuroscience Analysis. Journal of Cognitive Neuroscience, 28 (10). pp. 1553-1567. ISSN 0898-929X

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Abstract

Human visual search operates not only over space but also
over time, as old items remain in the visual field and new items appear. Preview search (where one set of distractors appears before the onset of a second set) has been used as a paradigm to study search over time and space [Watson, D. G., & Humphreys, G. W. Visual marking: Prioritizing selection for new objects by top–down attentional inhibition of old objects. Psychological Review, 104, 90–122, 1997], with participants showing efficient search when old distractors can be ignored and new targets prioritized. The benefits of preview search are lost, however, if a temporal gap is introduced between a first presentation of the old items and the re-presentation of
all the items in the search display [Kunar, M. A., Humphreys, G. W., & Smith, K. J. History matters: The preview benefit in search is not onset capture. Psychological Science, 14, 181–185, 2003a], consistent with the old items being bound by temporal onset to the new stimuli. This effect of temporal binding can be eliminated if the old items reappear briefly before the
new items, indicating also a role for the memory of the old
items. Here we simulate these effects of temporal coding in
search using the spiking search over time and space model
[Mavritsaki, E., Heinke, D., Allen, H., Deco, G., & Humphreys, G. W. Bridging the gap between physiology and behavior: Evidence from the sSoTS model of human visual attention. Psychological Review, 118, 3–41, 2011]. We show that a form of temporal binding by new onsets has to be introduced to the model to simulate the effects of a temporal gap, but that effects of the memory of the old item can stem from continued neural suppression across a temporal gap. We also show that the model can capture the effects of brain lesion on preview search under the different temporal conditions. The study provides a
proof-of-principle analysis that neural suppression and temporal binding can be sufficient to account for human search over time and space.

Item Type: Article
Subjects: C800 Psychology
Divisions: Faculty of Business, Law and Social Sciences > School of Social Sciences > Dept. Psychology
UoA Collections > REF2021 UoA 04: Psychology, Psychiatry and Neuroscience
Depositing User: Eirini Mavritsaki
Date Deposited: 18 Jun 2018 08:43
Last Modified: 18 Jun 2018 08:43
URI: http://www.open-access.bcu.ac.uk/id/eprint/3395

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