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Terms in this set (13)
To show that the hemispheres of the brain have independent functions and memories
Aim of Sperry's study?
Type of experimental method used in Sperry's study?
Split brain or normal
IV of Sperry's study
The participant's performance in visual and tactile tasks
DV of Sperry's study
Because a small number of participants were studied in detail
Why is it considered a case study?
11 split brain patients who had undergone commisurotomies before the study
They all had epilepsy that could not be controlled by drugs
All were right handed
What is the sample for Sperry's study?
Participants were instructed not to speak aloud to prevent information from entering both hemispheres via the ears
Instructions given before the main procedure?
Participants had one eye covered
He gazed at a fixation cross
Visual stimuli was projected to the right or left if the screen very quickly (1/10 of a second or less)
Too fast for the participant to move his head to leak the image to the other visual field
Participants were asked to identify what they saw through speech, writing or drawing
What was the procedure for visual tests?
Participant put their hands through the gap below the screen (unable to see their hands)
Objects were presented to the right or left hands or both simultaneously
Participants were asked to identify what they were holding through speech, writing, drawing or from manual selection from various objects
What was the procedure for tactile tests?
What was the apparatus used?
- information shown to one side of the visual field was only recognised again when it is shown to the same visual field
- information presented to the RVF could be described in speech and writing (with the right hand). If the same information was presented to the LVF, the participant would say he saw nothing or that he saw a light. However, the P could still point to the object or find the objects from a pile of objects with his hand out of view
- if 2 symbols were presented to each visual field at the same time, the P would draw one presented to the LVF but say he saw the one presented to the RVF
Visual tests results
- Objects felt by one hand were only recognised if they were picked up by the same hand
- objects placed in the right hand could be described in speech and writing (with the right hand). If the same objects were presented to the left hand, the P would not know they were holding anything or guess what he was holding
- one object was placed in the right hand and the other in the left with the P's hands out of view. The objects were then hidden in a pile of objects. Each hand searched for its own object, ignoring the other hand's object
Tactile tests results
- People with split brains have two independent streams of consciousness.
- in right handed people, the left hemisphere is dominant because it controls language
Conclusions of Sperry's study
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OTHER SETS BY THIS CREATOR
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