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One Brain or Two?

One Brain or Two?. Background. Exploring: extent that the two halves of the brain function independently By: Surgically severing the corpus callosum. Roger W. Sperry. Michael Gazzaniga. Experiment. Testing patient’s mental (cognitive) abilities in each hemisphere. Visual Abilities

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One Brain or Two?

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  1. One Brain or Two?

  2. Background Exploring: • extent that the two halves of the brain function independently By: • Surgically severing the corpus callosum Roger W. Sperry Michael Gazzaniga

  3. Experiment Testing patient’s mental (cognitive) abilities in each hemisphere Visual Abilities -board w/ lights Tactile (touch) Stimulations -recognition of familiar objects behind back Auditory Abilities -identification of objects in a bag when verbally commanded

  4. Patient Results Said they only saw lights on right side, but when asked to point at flashing light they pointed to all. Recognized & named only the objects placed in right hand, but matched object in left hand when presented. Could identify certain specific objects in a bag with right hand when verbally commanded, but when left hand was used they were unable to identify. 1) 2) 3)

  5. Historical Significance • 2 hemispheres have specialized skills & functions

  6. Ethical Questions/Criticisms? • Not too critical • Integration of both halves vs. two separate minds • Jarre Levy • One stronger than other?

  7. Recent Applications • Allows more effective treatment of victims of a stroke or head injury • More exploration on the two separate hemispheres • Children born without corpus callosum • Comparing people with left dominant and right dominant hand • Multiple Personality Disorder

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