Electrophysiological markers of visual dimension changes and response changes
Tollner, T. and Gramann, K. and Muller, Hermann J. and Kiss, Monika and Eimer, Martin (2008) Electrophysiological markers of visual dimension changes and response changes. Journal of Experimental Psychology: Human Perception and Performance 34 (3), pp. 531-542. ISSN 0096-1523.
In cross-dimensional visual search tasks, target discrimination is faster when the previous trial contained a target defined in the same visual dimension as the current trial. The dimension-weighting account (DWA; A. Found & H. J. Müller, 1996) explains this intertrial facilitation by assuming that visual dimensions are weighted at an early perceptual stage of processing. Recently, this view has been challenged by models claiming that intertrial facilitation effects are generated at later stages that follow attentional target selection (K. Mortier, J. Theeuwes, & P. A. Starreveld, 2005). To determine whether intertrial facilitation is generated at a perceptual stage, at the response selection stage, or both, the authors focused on specific event-related brain potential components (directly linkable to perceptual and response-related processing) during a compound search task. Visual dimension repetitions were mirrored by shorter latencies and enhanced amplitudes of the N2-posterior- contralateral, suggesting a facilitated allocation of attentional resources to the target. Response repetitions and changes systematically modulated the lateralized readiness potential amplitude, suggesting a benefit from residual activations of the previous trial biasing the correct response. Overall, the present findings strengthen the DWA by indicating a perceptual origin of dimension change costs in visual search.
|Keyword(s) / Subject(s):||attention, dimension weighting account, N2pc, lateralized readiness potential|
|School:||Birkbeck Schools and Departments > School of Science > Psychological Sciences|
|Date Deposited:||20 Dec 2010 10:22|
|Last Modified:||11 Oct 2016 12:00|
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