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Sperry - Split brains - Coggle Diagram
Sperry - Split brains
Procedure
Sperry conducted many different experimenters, including descrtbe what you see tasks, tactile tests and drawing tasks
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Visual stimuli are projected onto the back go the screen, either on the right or left hand side at a high speed (one picture every 0.1 seconds)
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They completed 5 tests: 2x verbal, 1x recognition, 1x tactile and 1x dual-processing task
The tests
Verbal task 1
Composite word shown on the screen (e.g. keycaps), so that 'key' is in LVF and 'case' is in RVF, patient is asked to report the word seen
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Dual-processing task
2 objects are placed simultaneously, one in each hand, and then hidden in a pile of objects, each hand is required to recognise the objects
Method
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When info is presented to one hemisphere in a split-brain patient, the info is not transferred to the other hemisphere
Design
Controlled observation
Of split brain patients to investigate behavioural symptoms that were a result of hemisphere deconnection
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Quasi experiment
IV (split brain or not) is already there, not manipulated by researchers. DV - performance on visual and tactile tests
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Sample
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Opportunity sample
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One patient was female, 30s, mother + housewife, SB 4 years prior
One patient was male, SB 5.5 Yeats prior
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Materials and apparatus
Tachistoscope
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Projected images onto a screen (either right or left side of the screen and so were seen by the LVF and RVF)
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Results
Baseline results
If a projected picture is show and response to in one visual field, it is only recognised again if it appears in that visual field
If visual material appears in the RVF (processed by LH), the ppt would describe it in speech and in writing with right hand
If the same visual material is projected to the LVF (processed by RH) then the ppt says he did not see anything or says there was just a flash on his left side (language centres are in the LH)
If you then ask the same ppt to use his left hand (RH control) to point to a matching picture or object in a collection of pictures/objects, he points to the item he just insisted he couldn't see
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Aim
To investigate the psychological effects of hemispheric reconnect in split-brain patients with severe epilepsy, and to use the results to understand how the RH (right hemisphere) and LH (left hemisphere) work in 'normal' individuals