Volume 6, Number 9, Article 11, Pages 982-995 doi:10.1167/6.9.11 http://journalofvision.org/6/9/11/ ISSN 1534-7362
Role of focal attention on latencies and trajectories of visually guided manual pointing
Joo-Hyun Song
Department of Psychology, Harvard University, Cambridge, MA, USA
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Ken Nakayama
Department of Psychology, Harvard University, Cambridge, MA, USA
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Abstract

Previous studies have shown that an odd-colored target among uniformly colored distractors can be rapidly detected and localized using broadly distributed attention over an entire display. In the current study, we show that such a broadly distributed attentional allocation is not sufficient for seemingly effortless goal-directed manual pointing. Latencies and movement durations of manual pointing in odd-colored search tasks become shorter and curved trajectories decreased as the number of distractors increase or target color repetitions increases. Because these manipulations have been shown to facilitate the deployment of narrowly focused attention to a target but not for distributed attention, this adds further support to the view that focal attention is necessary for goal-directed action. In addition, the presence of highly curved movement trajectories, directed first to a distractor then to the target reflects ongoing changes in focal attentional deployment and target selection.

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History
Received December 16, 2005; published August 30, 2006
Citation
Song, J.-H., & Nakayama, K. (2006). Role of focal attention on latencies and trajectories of visually guided manual pointing. Journal of Vision, 6(9):11, 982-995, http://journalofvision.org/6/9/11/, doi:10.1167/6.9.11.
Keywords
focal attention, distributed attention, perceptual grouping, perceptual priming, manual pointing
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