"Pseudoextinction": Asymmetries in Simultaneous Attentional Selection.
We report robust visual-field asymmetries associated with selecting simultaneous targets. One letter embedded in a rapid serial visual presentation (RSVP) of letters was encircled by a white ring, cueing it as the target to report. In some conditions, 2 RSVP streams were presented concurrently, and...
| Published in: | Journal of Experimental Psychology. Human Perception & Performance Vol. 41; no. 2; pp. 364 - 385 |
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| Main Authors: | , |
| Format: | Article |
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American Psychological Association
Apr2015
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=101858189&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 101858189 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 00961523 EPH jtl: Journal of Experimental Psychology. Human Perception & Performance issn: 00961523 maglogo: N pubinfo: dt: Apr2015 vid: 41 iid: 2 pid: 34 pub: American Psychological Association artinfo: ui: 101858189 10.1037/a0038734 ppf: 364 ppct: 21 formats: tig: atl: "Pseudoextinction": Asymmetries in Simultaneous Attentional Selection. aug: au: Goodbourn, Patrick T. Holcombe, Alex O. affil: University of Sydney su: Distraction Visual fields Visual extinction (Neurology) Visual perception Brain function localization sug: subj: Distraction Visual fields Visual extinction (Neurology) Visual perception Brain function localization keyword: cerebral hemispheres divided attention pseudoneglect rapid serial visual presentation visual extinction cerebral hemispheres divided attention pseudoneglect rapid serial visual presentation visual extinction ab: We report robust visual-field asymmetries associated with selecting simultaneous targets. One letter embedded in a rapid serial visual presentation (RSVP) of letters was encircled by a white ring, cueing it as the target to report. In some conditions, 2 RSVP streams were presented concurrently, and targets appeared simultaneously in both. When only 1 stream was cued, performance was similar regardless of whether it was in the left or right visual field. Cueing 2 streams barely affected performance in the left stream, but performance in the right stream suffered markedly. We term this phenomenon pseudoextinction, by analogy to pseudoneglect whereby observers bisect lines to the left of center. Such attentional asymmetries are often believed to originate from a processing imbalance between the 2 cerebral hemispheres. But pseudoextinction also occurred with vertically arrayed streams, with higher efficacy in the superior than in the inferior stream. Mixture modeling of errors indicated that pseudoextinction did not affect the temporal precision or latency of selection episodes; rather, only the efficacy of selection suffered. These findings lead us to suggest that pseudoextinction arises because perceptual traces are activated simultaneously in a visual buffer, but must be tokenized serially. Observers succeed in selecting simultaneous targets because trace activation occurs in parallel. However, observers often fail to report both targets because tokenization proceeds serially: While 1 target is being tokenized, the other's trace may decay below the activation level necessary for tokenization. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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