ERP Indices of Attentional Disengagement and Filtering Following Reflexive Attentional Capture Public Deposited

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Last Modified
  • March 22, 2019
Creator
  • Ford, Cassie
    • Affiliation: College of Arts and Sciences, Department of Psychology and Neuroscience
Abstract
  • The goal of this study was dissociate the mechanism of target selection when distractor suppression is required from spatial disengagement and reorienting. Specifically, we aimed to elicit and compare online event-related potential (ERP) indices of these attention mechanisms, the N2pc, IIN and P4pc. Combining the classic spatial cuing paradigm with a modified visual search design allowed the comparison of these components when attention was either reflexively oriented to the location of an upcoming target, or was reflexively captured to the opposite visual field, requiring disengagement and reorienting to the target. Reaction times and early sensory processing ERP components indicated that attention was reflexively captured by the cue, extending established reflexive attention effects from simple cuing paradigms to visual search. The ERP results suggest that the N2pc reliably indexes the direction of spatial attention, but is not an appropriate marker of the shifting of spatial attention. Significant IIN and P4pc components were found only for conditions requiring disengagement, suggesting that both may reflect the disengagement and reorienting of attention, indexing these mechanisms better than the N2pc.
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  • In Copyright
Advisor
  • Hopfinger, Joseph
Degree
  • Master of Arts
Graduation year
  • 2013
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