Although the right and left hemispheres are in many ways mirror images of each other, there are distinct areas dealing with speech production.(Left side)
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Theory
The primary motor cortex is situated in the frontal lobe and areas in the right hemisphere receive information from and are concerned with the activities of the left side of the body and vice versa.
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Theory
Sperry believes that studies involving split-brain patients reveal the ‘true’ nature of the two hemispheres because of the disconnection of the corpus callosum in the hemispheres which means they can only work independently.
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Background
Sperry and other scientists used animals with split brain before.
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Background
Other research by Sperry on both humans and monkeys who had undergone surgical section of the corpus callosum suggested the behavioural effects of this surgery may be less severe than other forms of cerebral surgery. eg frontal lobotomy
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Background
Sperry set out in this study, using split-brain patients, to show that each hemisphere:(i) Possesses an independent stream of conscious awareness. (ii) Has its own separate chain of memories that are inaccessible to the other.
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Research method
it's a quasi/natural experiment
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Research method
IV- If they had split brain or not. (However out of his control)
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Research method
DV-the participant’s ability to perform a variety of visual and tactile tests.
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Sample
11-that is split brain. A man-5.5 years ago.A women in her 30's-4 years ago. the rest recently had the op.
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Procedure
One eye covered they will see a word or a pic for 1/10 of a second. The infomation went from the left eye to right hemisphere and vice versa.
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Procedure
Participants could reach objects but not see their hands. Objects were then placed in either the participant’s right / left hand or both hands. Information about objects placed in the left hand is processed by the right hemisphere and vice versa.
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Procedure
Participants undertook a variety of both visual and tactile tests. This apparatus is called a tachistoscope.
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Procedure
Sperry also conducted a variety of other tests which highlighted the lateralisation of brain function.
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Findings
Information presented to the RVF could be described in speech and writing . If the same information is presented to the LVF , the participant insisted he either did not see anything or that there was only a flash of light on the left side.
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Findings
However the participant could point with his left hand to a matching picture / object presented among a collection of pictures / objects.
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Findings
Objects placed in the right hand could be described in speech or writing. If the same objects were placed in the left hand participants could only make wild guesses and often seemed unaware they were holding anything.
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Findings
Objects felt by one hand were only recognized again by the same hand.When two objects were placed simultaneously in each hand and then hidden in a pile of objects, both hands selected their own object and ignored the other hand’s object.
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Conclusions
People with split brains have two separate visual inner worlds, each with its own train of visual images.
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Conclusions
Split-brain patients have a lack of cross-integration where the second hemisphere does not know what the first hemisphere has been doing.
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Conclusions
Split-brain patients seem to have two independent streams of consciousness, each with its own memories, perceptions and impulses ie two minds in one body.
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Sampling
Opportunity Sampling
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Other cards in this set
Card 2
Front
The primary motor cortex is situated in the frontal lobe and areas in the right hemisphere receive information from and are concerned with the activities of the left side of the body and vice versa.
Back
Theory
Card 3
Front
Sperry believes that studies involving split-brain patients reveal the ‘true’ nature of the two hemispheres because of the disconnection of the corpus callosum in the hemispheres which means they can only work independently.
Back
Card 4
Front
Sperry and other scientists used animals with split brain before.
Back
Card 5
Front
Other research by Sperry on both humans and monkeys who had undergone surgical section of the corpus callosum suggested the behavioural effects of this surgery may be less severe than other forms of cerebral surgery. eg frontal lobotomy
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