A variety of stimulus factors have recently been shown to influence the performance of normal subjects on line bisection tasks (i.e., pseudoneglect), independent of motoric factors such as scanning or hand use [McCourt and Jewell (1999) Neuropsychologia 35, 843-55]. An experiment is described which further examined the modulating influence of line geometry in determining the magnitude of pseudoneglect. Subjects bisected horizontally oriented trapezoidal lines presented in central vision whose narrow end pointed either left or right. A highly significant influence of line geometry was found which modulated a tonic leftward error (i.e., pseudoneglect). The results are interpreted in the context of a 'center-of-mass' effect [Shuren, Jacobs and Heilman (1997) Brain and Cognition, 34, 293-300]. Further studies designed to tease apart the potentially independent effects of perceptual and attentional asymmetry on bisection performance are suggested. Copyright (C) 2000 Elsevier Science Ltd.
ASJC Scopus subject areas
- Experimental and Cognitive Psychology
- Cognitive Neuroscience
- Behavioral Neuroscience