Visual line bisection in sinistrals and dextrals as a function of hemispace, hand, and scan direction

被引:35
作者
Brodie, EE [1 ]
Dunn, EM [1 ]
机构
[1] Glasgow Caledonian Univ, Dept Psychol, Glasgow G4 0BA, Lanark, Scotland
关键词
pseudoneglect; hand preference; visual line bisection; spatial attention;
D O I
10.1016/j.bandc.2004.09.019
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Visual line bisection was investigated in 26 sinistral and 24 dextral subjects as a function of hemispace, hand and scan direction. An ANOVA revealed significant main effects for hand preference, due to the mean bisection errors of dextral subjects being significantly leftward of those of sinistral subjects; for hand, due to the bisection errors of the left hand being significantly to the left of the right hand: and for scan, due to the bisection errors following a left scan being significantly to the left of a right scan. One significant interaction was found, that between hand and direction of scan, due to a significant difference between left and right hands following a scan from the left but not following a scan from the right. For dextral subjects the leftward bisection errors of the left and right hands following a scan from the left, but not for a scan from the right, differed significantly from the midpoint. For sinistral subjects the leftward bisection errors following a scan from the left and rightward bisection errors following a scan from the right differed significantly from the midpoint for the left hand but not for the right hand. No significant main effect or interactions for hemispace were found. This confirms that both sinistral and dextral subjects display pseudoneglect when using their preferred hand and scanning from the left. However, sinistrals, but not dextrals, will display reversed pseudoneglect when using their preferred hand and adopting a scan direction from the right. These results are discussed in terms of the interaction between three factors, whose influence can jointly and severally produce misbisections, hemispheric specialisation for visuospatial function, hemispheric activation for a manual response, and the allocation of visual attention. (c) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:149 / 156
页数:8
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