Abstract
Complete section of the corpus callosum and anterior commissure, at a single operation, produces a set of specific and enduring behavioural symptoms that may be directly correlated with loss of the forebrain commissures (Sperry 1974). By contrast, congenital absence of the corpus callosum is notable for the lack of ‘disconnection syndromes’ (Ettiinger et al.,1972, 1974; Jeeves, 1965; Jeeves and Rajalakshmi, 1964; Saul and Sperry, 1968 see also chapter 36 herein). This striking contrast has been variously explained; Sperry (1968) and Gazzaniga (1970) hypothesised the development of language and speech mechanisms in both hemispheres; Jeeves (1965, 1969), impressed by the reduced efficiency evident on some cross-integration tasks in acallosals, suggested the use of alternative mid-brain pathways and emphasised the potentially high capacity of the human brain to use small, intact remnants of the commissures to compensate for and conceal disconnection deficits; Gazzaniga (1970) stressed the possibility of increased usage of ipsilateral projections. Such explanations, in terms of neural and/or behavioural compensations, raise more general issues concerning neural plasticity and recovery of function in the central nervous system (Stein et al., 1974).
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© 1979 I. Steele Russell, M. W. van Hof and G. Berlucchi
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Jeeves, M.A. (1979). Some Limits to Interhemispheric Integration in Cases of Callosal Agenesis and Partial Commissurotomy. In: Russell, I.S., van Hof, M.W., Berlucchi, G. (eds) Structure and Function of Cerebral Commissures. Palgrave, London. https://doi.org/10.1007/978-1-349-03645-5_37
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DOI: https://doi.org/10.1007/978-1-349-03645-5_37
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