Attentional selection and identification of visual objects are reflected by distinct electrophysiological responses |
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Authors: | Veronica Mazza Massimo Turatto Carlo Umiltà Martin Eimer |
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Institution: | (1) Department of Cognitive Sciences and Education, University of Trento, Trento, Italy;(2) Center for Mind/Brain Sciences, University of Trento, Trento, Italy;(3) Department of General Psychology, University of Padova, Padova, Italy;(4) School of Psychology, Birkbeck College, University of London, London, England;(5) Corso Bettini 31, 38068 Rovereto, Italy |
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Abstract: | Lateralised ERP responses were measured over posterior visual brain regions in response to visual search arrays that contained
one colour singleton. In the localisation task, responses were determined by the visual hemifield where this singleton was
presented. In the discrimination task, they were determined by the singletons’ shape. While an N2pc component was elicited
in an identical fashion in both tasks, a subsequent sustained contralateral negativity was consistently present at posterior
sites in the discrimination task only. This dissociation demonstrates that these two activations reflect distinct visual processing
stages. We suggest that while the N2pc reflects the ability of the visual system both to identify and localise a relevant
stimulus in the scene, the late sustained activity reflects the subsequent in-depth analysis and identification of these stimuli. |
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Keywords: | Visual– spatial attention Visual cognition Visual working memory Attentional control Event-related brain potentials |
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