PLASTICITY IN SPEECH ORGANIZATION FOLLOWING COMMISSUROTOMY
Abstract
For three-and-a-half years we have been studying the cognitive and conscious mechanisms in a remarkable 18-year-old man: Case P.S. This unique individual had his corpus callosum divided in order to control intractable epilepsy. Although for some time after the operation he appeared like other split-brain patients, unable to describe verbally stimuli directed to his mute right hemisphere, he behaved as if he was capable of comprehending a wide range of language-related stimuli directed to that hemisphere. Spelling by choosing the appropriate letters with his left hand, he could process nouns, verbs, rhymes, antonyms, and superordinate concepts. When asked about tachistoscopic presentations delivered to his left visual field, he either said he had seen nothing, or only a flash of light. He was also unable to identify verbally tactile 'sterognostic' inputs to his left hand. In the last year P.S. has begun to speak about stimuli directed to his right hemisphere. This series of experiments suggests that this speech is not interhemispheric transfer within the visual modality. Further, plotting the relative increased proficiency of verbal description of inputs directed to the right hemisphere, this speech system seems to be in a process of continuing development.
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Some callosotomy patients have shown ability to produce speech from their previously silent right hemispheres 26-36 months postoperatively.
“For example, some callosotomy patients have shown evidence of an ability to produce speech out of their previously silent right hemispheres 26-36 months © Oxford University Press 1996 postoperatively (Gazzaniga et ai, 1979)”
From Collaboration between the hemispheres of a callosotomy patient: Emerging right hemisphere speech and the left hemisphere interpreter (1996) · cites this paper as Gazzaniga et al., 1979
J.W.'s present capacity to name left field stimuli is comparable with the naming capacities of certain other patients who have undergone callosal section.
“Overall, J.W.'s present capacity to name left field stimuli is comparable with the naming capacities of certain other patients who have undergone callosal section (Gazzaniga et al., 1979(Gazzaniga et al., , 1984)).”
From Collaboration between the hemispheres of a callosotomy patient: Emerging right hemisphere speech and the left hemisphere interpreter (1996) · cites this paper as Gazzaniga et al., 1979
In previous cases, the development of right hemisphere speech capability occurred much earlier in the postoperative course.
“In previous cases, however, the development of right hemisphere speech capability occurred much earlier in the postoperative course.”
From Collaboration between the hemispheres of a callosotomy patient: Emerging right hemisphere speech and the left hemisphere interpreter (1996) · cites this paper as Gazzaniga et al., 1979
Subcortical transfer of cognitive information sufficient for stimulus identification must be excluded.
“Specifically we must exclude the following possibilities: (i) improper lateralization of the stimulus material and (ii) subcortical transfer of cognitive information sufficient for stimulus identification (Gazzaniga et al., 1979;Zaidel, 1990).”
From Collaboration between the hemispheres of a callosotomy patient: Emerging right hemisphere speech and the left hemisphere interpreter (1996) · cites this paper as Gazzaniga et al., 1979
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Gazzaniga, M. S. (2000) · Brain · doi:10.1093/brain/123.7.1293 · Cited by 1,414 · see citing works
Self-citationPrinciples of human brain organization derived from split-brain studies
Gazzaniga, M. S. (1995) · Neuron · doi:10.1016/0896-6273(95)90280-5 · Cited by 287 · see citing works
Self-citationSplit-brain: what we know now and why this is important for understanding consciousness
de Haan, E. H. F., Corballis, P. M., Hillyard, S. A., Marzi, C. A., Seth, A., Lamme, V. A. F., Volz, L., Fabri, M., Schechter, E., Bayne, T., et al. (2020) · Neuropsychology Review · doi:10.1007/s11065-020-09439-3 · Cited by 86 · see citing works
Interaction in isolation: 50 years of insights from split-brain research
Volz, L. J., & Gazzaniga, M. S. (2017) · Brain · doi:10.1093/brain/awx139 · Cited by 86 · see citing works
Self-citationProfiles of right hemisphere language and speech following brain bisection
Gazzaniga, M. S., Smylie, C. S., Baynes, K., Hirst, W., & McCleary, C. (1984) · Brain and Language · doi:10.1016/0093-934x(84)90090-7 · Cited by 82 · see citing works
Self-citationGazzaniga, M. S., Eliassen, J. C., Nisenson, L., Wessinger, C. M., Fendrich, R., & Baynes, K. (1996) · Brain · doi:10.1093/brain/119.4.1255 · Cited by 47 · see citing works
Self-citation
- Authors
- GAZZANIGA, M. S., VOLPE, B. T., SMYLIE, C. S., WILSON, D. H., & LE DOUX, J. E.
- Affiliations
- Cornell University (US)
- Venue
- Brain
- Publisher
- Oxford University Press (OUP)
- Published
- 1979
- Volume
- 102
- Issue
- 4
- Pages
- 805-815
- ISSN
- 0006-8950 (ISSN-L)
- 1460-2156
- OpenAlex
- W2118902074
- Cited by
- 99
- References
- 0
- Citations by year
- 2025: 1 · 2023: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 2 · 2012: 1
- FWCI
- 6.64
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Brain (publishedVersion)
- PubMed (publishedVersion)
- HighWire Press Open Archive (submittedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Hemispheric Asymmetry in Neuroscience
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
- Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
- Keywords
- corpus callosotomy, split-brain, hemispheric lateralization, speech organization, interhemispheric transfer, language comprehension, drug-resistant epilepsy, corpus callosum
- MeSH terms
- Cerebral Cortex, Child, Corpus Callosum, Discrimination Learning, Dominance, Cerebral, Epilepsies, Partial, Humans, Male, Motor Skills, Neural Pathways, Pattern Recognition, Visual, Speech
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