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Sperry - Evaluation - Coggle Diagram
Sperry - Evaluation
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Background
Tests show large number of behavioural effects correlate directly to loss of neocortical commissures
Previous research split brain on animals showed behavioural effects (Myers 1961); Sperry 1967a;1976b)
Method
Design: Quasi experiment. IV: having split-brain or not. DV: participants ability to perform visual/tactile tasks
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Procedures
Visual: Participants one eye covered, center gaze on point in centre of tachistoscope. Visual stimuli: on projector for 1/10 second. Tactile: below screen, gap so participant can put hand on object and not see. Objects placed in participants left/right hand or both
Results:
Visual: Information presented to right visual field described in speech and writing with right hand. Same information to left visual field, participant insists seeing nothing. Participant could point with left hand to matching picture. If $ to LVF and ? to RVF simultaneously, participant could draw $ with left hand but reported seeing ?
Tactile: Objects in right hand described in speech/writing. if same object in left hand, participant unaware. Objects felt by one hand only recognised by same hand
Conclusions
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Split brain have two independent streams of consciousness, each with own memories, perceptions and impulses, like two minds in one body
Reliability
The Sperry study isn't reliable as it would not be possible to replicate exactly. Within both the visual and tactile tasks, the visual stimuli and objects aren't specified. This means that, if the experiment were to be carried out again, the visual stimuli and objects given would not be the same
The Sperry study is high in external reliability as the experiment can be replicated. Within the tactile experiment, participants had objects placed in either their left or right hands or both behind a translucent screen and the participants had to process and identify the objects in their hands. This shows that the experiment could easily be replicated and repeated with the exact same procedure
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