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One Brain or Two?
Transcript of One Brain or Two?
9/27/12 Per. 6 One Brain or Two? Background of Brain Hemispheres Premise The Study Subjects can see and feel pictures and words with both sides of their brains, but they can only express this to others with their left side
Visual tasks involving spatial relationships (such as drawing 3D objects) were done better with the left hand Results Implications Applications Relation to Chapter Roger W. Sperry Researched whether or not the brain was split into separate hemispheres
Severed connection between two halves of cat's brain
Eyes were covered, couldn't transition between the two halves Road to Split-Brain
Research The two hemispheres of the brain communicate through the "corpus callosum"
There was an ethical issue with normal study, but one treatment for seizures was severing the corpus callosum
4 of the 10 operants participated in a study done by Sperry and Gazzaniga Physical Left Right (cc) image by anemoneprojectors on Flickr Sides of the Brain Mental Controls the right side of the body Controls the ability to use language Controls the left side of the body Affects abilities ability for artistic activities The pair wanted to see if the halves could function independently, and their abilities/lack thereof. Visual Abilities Tactile Abilities Auditory Abilities Pictures of objects or words were displayed to only one eye, affecting only one hemisphere
Another experiment used a row of horizontal lights, and tested which lights the patients could see with both sides of the brain An object or word could be felt, but not touched
A picture was projected on one side of the brain and the subject would have to feel for the object Hypothesis Each hemisphere of the brain is its own conscious system. Both the left and the right hemispheres may be simultaneously conscious in different ways during the same experience. Variables The independent variable is whether or not the individual uses their left brain or their right brain.
The dependent variables are their different reactions to the various tests. This includes whether or not they can see something, feel it, say it, or hear it. Since both sides of the brain register sounds, Gazzaniga had to create responses to input
He told subjects to place different hands in a bag and find different objects Left Brain:
Reading Right Brain:
Artistic activities Two brains are better than one
Improves treatment of strokes or head injuries
Each brain has mind of its own (aspirations and emotions) Both brains have separate functions, and working together creates the best results (like reading)
Communication between hemispheres is necessary to understand others' actions
Hemisphericity determines interests and professions
Multiple personality disorder may be affected by the right hemisphere The split-brain experiment directly expands on Section 10 of Chapter 2, how the two brain hemispheres work together, as well as their separate functions