Unifying control over the body: consciousness and cross-cueing in split-brain patients

Volz, Lukas J.; Hillyard, Steven A.; Miller, Michael B.; Gazzaniga, Michael S.

doi:10.1093/brain/awx359

“…Moreover, functional systems that may be isolated within a hemisphere can have time during development to acquire subtle cues for communication and coordination that need not rely on neural connections between the hemispheres. Feedback of various sorts from facial muscles, eye movements, postural shifts, etc., can provide rather reliable information transfer between hemispheres [225]. These may account for the lack of a disconnection syndrome in children with early callosotomy.…”

Section: Interhemispheric Communication and Coordinationmentioning

confidence: 99%

Handedness Development: A Model for Investigating the Development of Hemispheric Specialization and Interhemispheric Coordination

Michel

¹

2021

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The author presents his perspective on the character of science, development, and handedness and relates these to his investigations of the early development of handedness. After presenting some ideas on what hemispheric specialization of function might mean for neural processing and how handedness should be assessed, the neuroscience of control of the arms/hands and interhemispheric communication and coordination are examined for how developmental processes can affect these mechanisms. The author’s work on the development of early handedness is reviewed and placed within a context of cascading events in which different forms of handedness emerge from earlier forms but not in a deterministic manner. This approach supports a continuous rather than categorical distribution of handedness and accounts for the predominance of right-handedness while maintaining a minority of left-handedness. Finally, the relation of the development of handedness to the development of several language and cognitive skills is examined.

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“…Feedback of various sorts from facial muscles, eye-movements, postural shifts, etc. can provide rather reliable information transfer between hemispheres (Volz, Hillyard, Miller, & Gazzaniga, 2018). These may account for the lack of a disconnection syndrome in children with early callosotomy.…”

Section: Inter-hemispheric Communication and Coordinationmentioning

confidence: 99%

Handedness Development: A Model for Investigating the Development of Hemispheric Specialization and Interhemispheric Coordination

Michel¹

2021

Preprint

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The author presents his perspective on the character of science, development, and handedness and relates these to his investigations of the early development of handedness. After presenting some ideas on what hemispheric specialization of function might mean for neural processing and how handedness should be assessed, the neuroscience of control of the arms/hands and interhemispheric communication and coordination are examined for how developmental processes can affect these mechanisms. The author’s work on the development of early handedness is reviewed and placed within a context of cascading events in which different forms of handedness emerge from earlier forms but not in a deterministic manner. This approach supports a continuous rather than categorical distribution of handedness and accounts for the predominance of right-handedness while maintaining a minority of left-handedness. Finally, the relation of the development of handedness to the development of several language and cognitive skills is examined.

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“…The third hypothesis argues that in addition to whatever direct neural communication may exist between the hemispheres, they may inform one another via strategic crosscueing processes (Volz & Gazzaniga, 2017;Volz et al, 2018). The split-brain patients underwent surgery many years prior to testing, and the separated perceptual systems have had ample time to learn how to compensate for the lack of commissural connections.…”

Section: Interpretationsmentioning

confidence: 99%

“…Since the earliest reports by van Wagenen and Herren (1940) and Akelaitis (1941Akelaitis ( , 1943 on the repercussions of a split-brain, two narratives have emerged. First and foremost is the functional description, pioneered by Gazzaniga, Sperry and colleagues (Gazzaniga, Bogen, & Sperry, 1963;Gazzaniga, Bogen, & Sperry, 1962;Sperry, 1968), in which the intricacies, the exceptions, the effects of different testing conditions, and the experimental confounds have been delineated by decades of extensive research with a relatively small group of patients (Berlucchi, Aglioti, Marzi, & Tassinari, 1995;Corballis, 1994;Corballis et al, 2010;Corballis, 2003;Luck, Hillyard, Mangun, & Gazzaniga, 1989;Pinto, Lamme, & de Haan, 2017b;Volz, Hillyard, Miller, & Gazzaniga, 2018). It is important to note that even in this small group there are differences.…”

Section: Introductionmentioning

confidence: 99%

Split-Brain: What We Know Now and Why This is Important for Understanding Consciousness

Haan

¹

,

Corballis

²

,

Hillyard

³

et al. 2020

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Unifying control over the body: consciousness and cross-cueing in split-brain patients

Cited by 12 publications

References 17 publications

Handedness Development: A Model for Investigating the Development of Hemispheric Specialization and Interhemispheric Coordination

Handedness Development: A Model for Investigating the Development of Hemispheric Specialization and Interhemispheric Coordination

Handedness Development: A Model for Investigating the Development of Hemispheric Specialization and Interhemispheric Coordination

Split-Brain: What We Know Now and Why This is Important for Understanding Consciousness

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