Sperry

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The division of tasks between the hemispheres is called lateralisation of functions. Outline how the functions are lateralized.
Left hemisphere = Right visual field, language, right hand, right ear, left nostril. Right hemisphere = Left visual field, creativity, left hand, left ear, right nostril.
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What part of the brain is severed in the treatment of epilepsy?
Corpus callosum
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What year was this study conducted?
1968
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Aim?
To investigate the effects of hemisphere deconnection and to show that each hemisphere has different functions.
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IV & DV?
IV=Hemisphere deconnection surgery DV=what they could identify with each hemisphere
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Design, method, data?
Quasi experiment, case-study, quantitative and qualitative
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Sample?
11 'split-brain' patients; all had undergone disconnection of hemispheres because of their history of advanced epilepsy which could not be controlled by medication. 2 had the treatment some time before the experiment, 9 recent. opportunity sample.
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Outline the visual task
Blindfolded one of their eyes. Asked them to fixate with seeing eye on point in middle of screen. Projected image onto either the right/left visual field for less than 1/10 of a second (so participant cannot move eye). LVF -should not be able to name
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Outline the tactile task
Participant could not see their hands. A stimulus was presented to one of their hands, and asked them to name it. If in LH participant should not be able to name it as language is in left hemisphere.
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Outline the findings of the visual task (1)
To hemisphere's work completely independently - if RVF shown image then LVF shown same image, would not recognise. If same visual field shown image twice would recognise. P's could not give description of image if shown to LVF but could point it out.
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Outline the findings of the visual task (2)
If 2 symbols presented, one on either side of the visual field (e.g. $ on left and ? on right). P required to draw with left hand what they saw, could not see hand, would draw symbol on left ($). Asked to say what they drew, would say right symbol, ?
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Outline the findings of the tactile task
If object placed in right hand participants able to identify object, yet if placed in left hand they seemed virtually unaware anything was there. If given lots of objects they could then pick the correct one they had been holding with left hand.
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Strengths of the study
high levels of control as carried out in lab, both data types (qual:speech, quant:performance), case study allowed in-depth data.
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Weaknesses of the study
Low EV-not used to images flashing in front of them,visiting lab... Sample=small so not generalizable (unavoidable)-may represent target pop, not natural pop. Control was p's with no hemisphere deconnection,more valid=epileptic with no disconnection.
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Ethics?
May cause psychological harm - struggling to answer, realise they are different, feel bad about themselves.
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Card 2

Front

What part of the brain is severed in the treatment of epilepsy?

Back

Corpus callosum

Card 3

Front

What year was this study conducted?

Back

Preview of the front of card 3

Card 4

Front

Aim?

Back

Preview of the front of card 4

Card 5

Front

IV & DV?

Back

Preview of the front of card 5
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