Article

Electrophysiological Correlates of the Focusing of Attention within Complex Visual Scenes: N2pc and Related ERP Components

Steven J. Luck

in The Oxford Handbook of Event-Related Potential Components

Published in print December 2011 | ISBN: 9780195374148
Published online September 2012 | | DOI: http://dx.doi.org/10.1093/oxfordhb/9780195374148.013.0161

Series: Oxford Library of Psychology

 Electrophysiological Correlates of the Focusing of Attention within Complex Visual Scenes: N2pc and Related ERP Components

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As discussed in Chapter 11 of this volume, attention plays a role in the perception of simple stimuli, serving as a gain control that enhances the speed or accuracy of feedforward visual processing. However, additional attentional mechanisms are needed to support the iterative, reentrant processes and perception-action loops that are involved in the perception of complex, multiple-element stimulus arrays, and the event-related potential (ERP) correlates of these additional attentional mechanisms will be the focus of the present chapter. The first half of the chapter begins by discussing the computational problems that must be solved by these mechanisms and the sequence of steps involved in processing complex stimulus arrays, which include storing a target template in working memory, detecting relevant features, focusing attention on a peripheral location, shifting overt attention to the attended location, and then expanding or contracting attention around the object at this location. The ERP components corresponding to each of these steps are then described. The second half of the chapter provides a closer look at N2pc and related contralateral components that reflect the focusing of attention onto a peripheral location.

Keywords: event-related potential components; visual attention; P1; N1; N2pc; distractor positivity (PD); sustained posterior contralateral negativity (SPCN)

Article.  21905 words. 

Subjects: Psychology ; Cognitive Psychology ; Cognitive Neuroscience

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