(from the chapter) Describes interhemispheric disconnection syndromes. The concept of disconnection symptoms presupposea that neural functions are localized and that neural connections are specific. However, typical brain lesions interrupt connections between multiple functional substrates, bringing about constellations of symptoms which constitute disconnection syndromes. The authors describe the historical evolution of the concept of the interhemispheric disconnection syndrome, the symptomatology of interhemispheric disconnection (including visual and auditory symptom, motor control, and memory). Temporary unrelated symptoms, such as diagnostic dispraxia and alien hand phenomenon, are also described. The authors also discuss mind and consciousness in the split brain. In conclusion, the authors argue that the overall unitarity and consistency of the behavior of commissurotomized patients is a fact, whereas inferenced that conceived the split brain as a 2-channel processor, or the organ of a double consciousness are not supported by sufficiently convincing evidence. Possible factors that can maintain unitarity in the control of the behavior of commissurotomy patients are described. ((c) 1999 APA/PsycINFO, all rights reserved)
Interhemispheric disconnection syndromes
BERLUCCHI, Giovanni;
1999-01-01
Abstract
(from the chapter) Describes interhemispheric disconnection syndromes. The concept of disconnection symptoms presupposea that neural functions are localized and that neural connections are specific. However, typical brain lesions interrupt connections between multiple functional substrates, bringing about constellations of symptoms which constitute disconnection syndromes. The authors describe the historical evolution of the concept of the interhemispheric disconnection syndrome, the symptomatology of interhemispheric disconnection (including visual and auditory symptom, motor control, and memory). Temporary unrelated symptoms, such as diagnostic dispraxia and alien hand phenomenon, are also described. The authors also discuss mind and consciousness in the split brain. In conclusion, the authors argue that the overall unitarity and consistency of the behavior of commissurotomized patients is a fact, whereas inferenced that conceived the split brain as a 2-channel processor, or the organ of a double consciousness are not supported by sufficiently convincing evidence. Possible factors that can maintain unitarity in the control of the behavior of commissurotomy patients are described. ((c) 1999 APA/PsycINFO, all rights reserved)
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