Pseudoneglect: evidence for both perceptual and attentional factors

Brain and Cognition
Clare PoracKatina Karagiannakis

Abstract

When neurologically normal individuals bisect a horizontal line as accurately as possible, they reliably show a slight leftward error. This leftward inaccuracy is called pseudoneglect because errors made by neurologically normal individuals are directionally opposite to those made by persons with visuospatial neglect (Jewell & McCourt, 2000). In the current study, normal right-handed observers bisected horizontal lines that were altered to bias line length judgments either toward the right or the left side of the line. Non-target dots were placed on or near the line stimuli using principles derived from a theory of visual illusions of length called centroid extraction (Morgan, Hole, & Glennerster, 1990). This theory argues that the position of a visual target is calculated as the mean position of all stimuli in close proximity to the target stimulus. We predicted that perceptual alterations that shifted the direction of centroid extraction would also shift the direction of line bisection errors. Our findings confirmed this prediction and support the idea that both perceptual and attentional factors contribute to the pseudoneglect effect.

References

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Citations

Apr 21, 2007·Psychological Science·R S W MastersR C Jackson
Jan 15, 2014·Neuropsychology Review·Joanna L BrooksStephen Darling
Feb 16, 2011·Journal of the International Neuropsychological Society : JINS·Peii ChenAnna M Barrett
Dec 2, 2014·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Nicole A ThomasMichael E R Nicholls
Apr 15, 2015·Vision Research·Francesca C FortenbaughLynn C Robertson
Oct 15, 2010·Perception·Natale StucchiLisa Scocchia
Nov 30, 2018·Attention, Perception & Psychophysics·Francesca C FortenbaughMichael Esterman

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