Central Perceptual Load Does Not Reduce Ipsilesional Flanker Interference in Parietal Extinction

Snow, Jacqueline C. and Mattingley, Jason B. (2008) Central Perceptual Load Does Not Reduce Ipsilesional Flanker Interference in Parietal Extinction. Neuropsychology, 22 3: 371-382. doi:10.1037/0894-4105.22.3.371

Author Snow, Jacqueline C.
Mattingley, Jason B.
Title Central Perceptual Load Does Not Reduce Ipsilesional Flanker Interference in Parietal Extinction
Journal name Neuropsychology   Check publisher's open access policy
ISSN 0894-4105
Publication date 2008-05-01
Year available 2008
Sub-type Article (original research)
DOI 10.1037/0894-4105.22.3.371
Open Access Status
Volume 22
Issue 3
Start page 371
End page 382
Total pages 12
Editor Rao, Stephen M.
Harris Susan J.A.
Place of publication United States
Publisher American Psychological Association
Language eng
Subject C1
170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
970117 Expanding Knowledge in Psychology and Cognitive Sciences
Abstract In healthy individuals, filtering of distractors improves when the perceptual difficulty, or load, of a central task increases. Following an earlier study by Lavie and Robertson (2001), this study examined whether increasing the perceptual load of a visual discrimination task attenuates the influence of ipsilesional and contralesional distractors in patients with spatial extinction. The authors used a flanker task in which participants identified a central target letter flanked by congruent, incongruent, or neutral distractors in the left and right hemifields. Perceptual load was manipulated by positioning the central target letter above or below a hash mark (#) in the low-load condition, or a letter ("R") in the high-load condition. Target identification was significantly more difficult under high load than low load. Despite this difference in task difficulty, the interference from incongruent flankers was equivalent across the two load conditions, for both contralesional and ipsilesional flankers. Our results suggest that perceptual load does not attenuate the distracting influence of ipsilesional stimuli. Rather, selectivity is strongly influenced by the strength of representations in brain areas that code salience across the visual field.
Keyword Psychology, Clinical
Neurosciences & Neurology
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Queensland Brain Institute Publications
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Tue, 10 Mar 2009, 01:05:17 EST by Debra McMurtrie on behalf of Queensland Brain Institute