The vertical–horizontal illusion in hemi-spatial neglect

The vertical–horizontal illusion is a robust phenomenon of length mis-estimation between two orthogonal lines. This illusion involves an anisotropy component that makes the vertical line appear longer than the horizontal one and a bisection component that makes the bisected line shorter than the bis...

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Bibliographic Details
Published in:Neuropsychologia 2010-09, Vol.48 (11), p.3245-3251
Main Authors: de Montalembert, M., Mamassian, P.
Format: Article
Language:English
Subjects:
Adult and adolescent clinical studies
Aged
Anisotropy
Biological and medical sciences
Bisection
Cognitive science
Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes
Female
Functional Laterality - physiology
Hemi-neglect
Humans
Male
Medical sciences
Middle Aged
Nervous system (semeiology, syndromes)
Neurology
Neuropsychological Tests
Neuroscience
Optical Illusions - physiology
Organic mental disorders. Neuropsychology
Perceptual Disorders - psychology
Photic Stimulation
Psychology
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Stroke - complications
Stroke - psychology
Vertical–horizontal illusion
Visual Perception - physiology
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Summary:The vertical–horizontal illusion is a robust phenomenon of length mis-estimation between two orthogonal lines. This illusion involves an anisotropy component that makes the vertical line appear longer than the horizontal one and a bisection component that makes the bisected line shorter than the bisecting one. Six patients presenting a moderate left hemi-neglect (N-patients) were compared to four right brain damaged patients without neglect (RH-patients) and with control participants in the perception of various spatial configurations of the vertical–horizontal illusion. Relative to controls, we found that both components of the illusion increased in patients: the anisotropy component rose from 5 to 11% and 10% (for N- and RH-patients, respectively) and the bisection component from 17 to 22% and 20% (for N- and RH-patients, respectively). In addition, we found that an horizontal-‘T’ figure oriented to the left produced much less bias than the same figure oriented to the right. These results are discussed in light of explanations based on attentional disengagement from an image junction and strength of the representation of objects extending over the neglected side.
ISSN:0028-3932
1873-3514
DOI:10.1016/j.neuropsychologia.2010.07.002