The influence of contextual stimuli on line-bisection performance was investigated. Subjects were required to bisect lines flanked at one end by one pair of solid black rectangles. Bisection was performed along three orthogonal axes (horizontal, radial, vertical). The results showed the presence of a bisection bias in the direction opposite to the location of flanking rectangles. This finding suggests that the presence of rectangles beside one end of a line interfered with representation of the line as a whole and induced the subjects to neglect the flanked part of the line.
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References
1.
BaldwinJ. M. (1895) The effect of size-contrast upon judgements of position in the retinal fluid. Psychological Review, 2, 214–259.
2.
BisiachH.VallarG. (1988) Hemineglect in humans. In BoilerP.GrafmanJ. (Eds.), Handbook of neuropsychology. Vol. 1. Amsterdam: Elsevier Pp. 195–222.
3.
BradshawJ. L.NathanG.NettletonN. C.WilsonL.PiersonJ. (1987) Why is there a left side underestimation in rod bisection?Neuropsychologia, 25, 735–738.
4.
BradshawJ. L.NettletonN. C.NathanG.WilsonL. (1985) Bisecting rods and lines: effects of horizontal and vertical posture on left-side underestimation by normal subjects. Neuropsychologia, 23, 421–425.
5.
ChieffiS. (1996) Effects of stimulus asymmetry on line bisection. Neurology, 47, 1004–1008.
6.
ChieffiS. (1999) Influence of perceptual factors on line bisection. Cortex, 35, 523–536.
7.
CorenS.GirgusJ. S. (1978) Visual illusion. In HeldR.LeibowitzH. W.TeuberH-L. (Eds.), Handbook of sensory physiology. Berlin: Springer-Verlag. Chap. 8. Pp. 549–568.
8.
FischerM. H. (1994) Less attention and more perception in cued line bisection. Brain and Cognition, 25, 24–33.
9.
GreeneE.NelsonB. (1997) Evaluating Müller-Lyer effects using single fin-set configurations. Perception & Psychophysics, 59, 293–312.
10.
HalliganR. W.ManningL.MarshallJ. C. (1990) Individual variation in line bisection: a study of four patients with right hemispheric damage and normal controls. Neuropsychologia, 28, 1043–1051.
11.
JewellG.McCourtM. E. (2000) Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks. Neuropsychologia, 38, 91–110.
12.
ManningL.HalliganP. W.MarshallJ. C. (1990) Individual variation in line bisection: a study of normal subjects with application to the interpretation of visual neglect. Neuropsychologia, 28, 647–655.
13.
ScarisbrickD. I.TweedyJ. R. T.KuslanskyG. (1987) Hand preference and performance effects on line bisection. Neuropsychologia, 25, 695–699.
14.
SheltonP. A.BowersD.HeilmanK. M. (1990) Personal and vertical neglect. Brain, 113, 191–205.
15.
ShurenJ. E.JacobsD. H.HeilmanK. M. (1997) The influence of mass effect on the distribution of spatial attention in vertical and horizontal dimensions. Brain and Cognition, 34, 293–300.
