Asymmetries in attention as revealed by fixations and saccades

Thomas, Nicole A., Loetscher, Tobias, and Nicholls, Michael E.R. (2014) Asymmetries in attention as revealed by fixations and saccades. Experimental Brain Research, 232 (10). pp. 3253-3267.

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Neurologically normal individuals devote more attention to the left side; an asymmetry known as pseudoneglect, which reflects right hemisphere involvement in visuospatial attention. The role of eye movements in attentional asymmetries has received little consideration, particularly in terms of the greyscales task. Stimulus length, elevation, and presentation duration were manipulated, while monitoring eye movements during the greyscales task. Region of interest analyses compared time spent examining each quadrant of the stimulus. Further, saccades were examined in conjunction with fixations to gain an understanding of overall eye movement patterns. Scatterplots combining x-and y-coordinates illustrate mean eye position. Results demonstrated a comparison strategy was used, where the dark portions of each rectangle were fixated. Mean eye position was within the lower left quadrant. The left visual field was inspected most for the baseline condition. Interestingly, the lower visual field was examined most when duration, length, or elevation was manipulated. Eye movement patterns provide a possible explanation for why correlations are y not observed between visuospatial tasks. Different strategies, based on specific-task demands, are likely to be used, which in turn, engage separate aspects of visuospatial attention.

Item ID: 52455
Item Type: Article (Research - C1)
ISSN: 1432-1106
Keywords: eye tracking; greyscales task, laterality; visual field differences; pseudoneglect; mean eye position
Funders: Natural Sciences and Engineering Research Council of Canada (NSERC)
Projects and Grants: NSERC potdoctoral research fellowship
Date Deposited: 18 Jul 2018 04:31
FoR Codes: 17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology) @ 50%
17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170112 Sensory Processes, Perception and Performance @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970117 Expanding Knowledge in Psychology and Cognitive Sciences @ 100%
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