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

Gregory Appelbaum, L.; Clark, Kait; van den Berg, Berry; Mitroff, Stephen R.; Woldorff, Marty G.


L. Gregory Appelbaum

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Dr Kait Clark
Senior Lecturer in Psychology (Cognitive and Neuro)

Berry van den Berg

Stephen R. Mitroff

Marty G. Woldorff


© 2015 the authors. Practice can improve performance on visual search tasks; 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 sensory-evoked N1 component at 150 ms increased bilaterally, indicating enhanced visual sensory processing of the array. Second, the negative-polarity posterior–contralateral component (N2pc, 170–250 ms) was earlier and larger, demonstrating enhanced attentional orienting. Third, the amplitude of the sustained posterior contralateral negativity component (SPCN, 300–400 ms) decreased, indicating facilitated 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.


Gregory Appelbaum, L., Clark, K., van den Berg, B., Mitroff, S. R., & Woldorff, M. G. (2015). Improvement in visual search with practice: Mapping learning-related changes in neurocognitive stages of processing. Journal of Neuroscience, 35(13), 5351-5359.

Journal Article Type Article
Acceptance Date Jan 22, 2015
Publication Date Jan 1, 2015
Deposit Date Aug 2, 2017
Journal Journal of Neuroscience
Electronic ISSN 1529-2401
Publisher Society for Neuroscience
Peer Reviewed Peer Reviewed
Volume 35
Issue 13
Pages 5351-5359
Keywords attention, EEG, learning, LRP, N2pc, visual search
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