Effects of set-size and selective spatial attention on motion processing

Vision Research
Karen R Dobkins, Rain G Bosworth

Abstract

In order to investigate the effects of divided attention and selective spatial attention on motion processing, we obtained direction-of-motion thresholds using a stochastic motion display under various attentional manipulations and stimulus durations (100-600 ms). To investigate divided attention, we compared motion thresholds obtained when a single motion stimulus was presented in the visual field (set-size=1) to those obtained when the motion stimulus was presented amongst three confusable noise distractors (set-size=4). The magnitude of the observed detriment in performance with an increase in set-size from 1 to 4 could be accounted for by a simple decision model based on signal detection theory, which assumes that attentional resources are not limited in capacity. To investigate selective attention, we compared motion thresholds obtained when a valid pre-cue alerted the subject to the location of the to-be-presented motion stimulus to those obtained when no pre-cue was provided. As expected, the effect of pre-cueing was large when the visual field contained noise distractors, an effect we attribute to "noise reduction" (i.e. the pre-cue allows subjects to exclude irrelevant distractors that would otherwise impair performanc...Continue Reading

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Citations

Oct 9, 2002·Progress in Neuro-psychopharmacology & Biological Psychiatry·Chiang-Shan Ray Li
Jan 29, 2003·Learning & Memory·Virve VuontelaEeva T Aronen
May 9, 2007·Psychonomic Bulletin & Review·Taosheng LiuMarisa Carrasco
Mar 5, 2013·Brain and Cognition·Rain G BosworthKaren R Dobkins
Jul 19, 2005·Vision Research·Fatima M Felisberti, Johannes M Zanker
Oct 12, 2004·Vision Research·Amy RezecKaren R Dobkins
Dec 3, 2011·Perception·Yaffa Yeshurun, Elisabeth Hein
Jul 17, 2020·Perception·Yousef M ShahinDeborah Giaschi

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