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Improvement in visual search with practice: mapping learning-related changes in neurocognitive stages of processing

Clark, Kait, Appelbaum, L. Gregory, van den Berg, Berry, Mitroff, Stephen R. and Woldorff, Marty G. 2015. Improvement in visual search with practice: mapping learning-related changes in neurocognitive stages of processing. Journal of Neuroscience 35 (13) , pp. 5351-5359. 10.1523/JNEUROSCI.1152-14.2015

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Practice can improve performance on visual searchtasks;the neural mechanisms underlying such improvements, however, are not clear. Response time typically shortens with practice, but which components of the stimulus–response processing chain facilitate this behavioral change? Improved search performance could result from enhancements in various cognitive processing stages, including (1) sensory processing, (2) attentional allocation, (3) target discrimination, (4) motor-response preparation, and/or (5) response execution. We measured event-related potentials (ERPs) as human participants completed a five-day visual-search protocol in which they reported the orientation of a color popout target within an array of ellipses. We assessed changes in behavioral performance and in ERP components associated with various stages of processing. After practice, response time decreased in all participants (while accuracy remained consistent), and electrophysiological measures revealed modulation of several ERP components. First, amplitudes of the early sensoryevoked N1 component at 150 ms increased bilaterally, indicating enhanced visual sensory processing of the array. Second, the negativepolarity posterior– contralateral component (N2pc, 170 –250 ms) was earlier and larger, demonstrating enhanced attentional orienting. Third,the amplitude ofthe sustained posterior contralateral negativity component (SPCN, 300 – 400 ms) decreased, indicatingfacilitated target discrimination. Finally, faster motor-response preparation and execution were observed after practice, as indicated by latency changes in both the stimulus-locked and response-locked lateralized readiness potentials (LRPs). These electrophysiological results delineate the functional plasticity in key mechanisms underlying visual search with high temporal resolution and illustrate how practice influences various cognitive and neural processing stages leading to enhanced behavioral performance.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Society for Neuroscience
ISSN: 0270-6474
Funders: ESRC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 23 January 2015
Last Modified: 28 Jun 2019 03:09

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