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Event-related potential evidence for a dual-locus model of global/local processing
Authors:Kirsten A. Dalrymple  Alan Kingstone  Todd C. Handy
Affiliation:1. University of British Columbia , Vancouver, BC, Canada kdalrymple@psych.ubc.ca;3. University of British Columbia , Vancouver, BC, Canada
Abstract:We investigated the perceptual time course of global/local processing using event-related potentials (ERPs). Participants discriminated the global or local level of hierarchical letters of different sizes and densities. Participants were faster to discriminate the local level of large/sparse letters and the global level of small/dense letters. This was mirrored in early ERP components: The N1/N2 had smaller peak amplitudes when participants made discriminations at the level that took precedence. Only global discriminations for large/sparse letters led to amplitude enhancement of the later P3 component, suggesting that additional attention-demanding processes are involved in discriminating the global level of these stimuli. Our findings suggest a dual-locus time course for global/local processing: (a) Level precedence occurs early in visual processing; (b) extra processing is required at a later stage, but only for global discriminations of large, sparse, stimuli, which may require additional attentional resources for active grouping.
Keywords:Global/local processing  Event-related potentials  Hierarchical stimuli  Attention
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