Can commissurotomized subjects compare digits between the visual fields?
Abstract
Sergent (Brain 113, 537-568, 1990) flashed pairs of digits to the opposite visual fields of three commissurotomized subjects (L.B., N.G. and A.A.), and found that they were highly accurate in deciding which digit was the larger, but at little or no better than chance in deciding whether the digits were the same or different. Experiment 1 confirmed that these subjects were better at relative than at same-different judgements. However their performance on relative judgements was considerably lower than in Sergent's study and could be explained largely in terms of the subjects' use of information available to a single hemisphere. A fourth subject, D.K., with section of the posterior corpus callosum only, had little difficulty with either task despite previous evidence of visual disconnection, and appeared able to transfer the information verbally. In Experiment 2, L.B. was better able to make both relative and same-different judgements when the digits were presented within either the left or right visual fields than when they were presented in opposite fields. These results suggest little, if any, interhemispheric transfer of either shape or numerical information following complete forebrain commissurotomy.
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Although it has been proposed that callosotomy patients have the ability to transfer abstract information sub-cortically, there is substantial data to the contrary.
“Although it has been proposed that callosotomy patients have the ability to transfer abstract information sub-cortically (Cronin-Golomb, 1986;Sergent, 1990), there is substantial data to the contrary (Corballis, 1994;Seymour et al., 1994;Kingstone and Gazzaniga, 1995).”
From Collaboration between the hemispheres of a callosotomy patient: Emerging right hemisphere speech and the left hemisphere interpreter (1996) · cites this paper as Corballis, 1994
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- Authors
- Corballis, M. C.
- Affiliations
- University of Auckland (NZ)
- Corresponding author
- Corballis, Michael C.
- Venue
- Neuropsychologia
- Publisher
- Elsevier BV
- Published
- 1994-12
- Volume
- 32
- Issue
- 12
- Pages
- 1475-1486
- ISSN
- 0028-3932 (ISSN-L)
- OpenAlex
- W2073786488
- Cited by
- 37
- References
- 13
- Citations by year
- 2024: 2 · 2023: 2 · 2021: 1 · 2020: 2 · 2019: 1 · 2017: 1
- FWCI
- 1.91
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neuropsychologia (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Hemispheric Asymmetry in Neuroscience
- Life Sciences › Neuroscience › Cognitive Neuroscience › Spatial Neglect and Hemispheric Dysfunction
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Keywords
- corpus callosotomy, interhemispheric transfer, numerical information, visual field, hemispheric lateralization
- MeSH terms
- Adult, Attention, Corpus Callosum, Discrimination Learning, Dominance, Cerebral, Female, Follow-Up Studies, Humans, Functional Laterality, Male, Middle Aged, Neuropsychological Tests, Orientation, Pattern Recognition, Visual, Postoperative Complications, Mental Recall, Visual Fields
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