R Sperry

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  • Created by: jessie
  • Created on: 28-02-14 20:25
what is the name of this study?
hemisphere disconnection and unity in consciousness
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what is the aim of the experiment?
to investigate the effects of hemisphere disconnection and to show that each hemisphere has different functions
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what is the IV of the experiment?
whether a person had hemisphere disconnection or not
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what was the DV of the experiment?
the participants performance on the tasks
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what research method was used?
quasi experimental method/ clinical case studies/ case study method
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what was the sample of the experiment?
11 ' split brain' patients who were compared to ' normal ' patients
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what did sperry do?
used a number of ingenious tasks in order to investigate lateralisation of brain function
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how were the tasks carried out?
in controlled conditions, using specialised equipment, and were highly standardised
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what did the tasks involve?
setting tasks separately to the two hemispheres
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what was one of the tasks used to do?
send information to just one hemisphere involved asking participants to respond to visual information
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what did it involve?
blindfolding one of the participants eyes and then asking them to fixate with the eye on a point in the middle of a screen
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what would the researchers then do?
project a stimulus on either the left or right hand side of the fixation point for less than 1/10 of a second
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what will happen as language is being processed in the left hemisphere?
the split brain patients should not be able to name the stimulus
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what was another of the tasks of the experiment?
asking patients to respond to tacticle information
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What did this involve?
presenting a stimulus to one hand of a split brain patient so the participant could not see the stimulus and then asking the participant to name it
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what should the participant not be able to do?
name the stimulus if it is in their left hand
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what were some of the results of the experiment?
When participants were presented with an image in one half of their visual field and then presented with the same image in the other half they responded as if they had never seen the image before
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what happened when the image presented was shown in the original visual field
then the participants would be able to recognise the image as the one they had seen before.
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what were they not able to do?
give a description of an image that was presented to the left hand side of the visual field
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what happened?
the image was either not noticed or just appeared as a flash
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what was another finding of the experiment?
objects put in the participants hand for identification by touch could be described or named in speech or writing if they were in the right hand but if in the left then not the case
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Through the case studies what did Sperry find?
that the hemisphere disconnection did not appear to affect the patients intelligence or personality
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what effects did the operation have on the patients?
they had short term memory deficits, limited concentration spans and orientation problems
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what did Sperry argue that his studies did?
give considerable support for his arguments of lateralisation of function
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what did he go on to argue?
that each hemisphere has it owns perceptions and memories and experiences
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what is a strength of Sperry's procedure?
able to combine qualitative and quantitative approaches, validity
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what were the weaknesses of his procedure?
loses reliability, sample, ecological validity - not representative of real life
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what does Sperry argue his studies do?
demonstrates that there is a lateralisation of function
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what conclusions were made from Sperry's experiment?
the left hemisphere ( in right handed people) is specialised for speech, writing and language, can communicate the visual experiences of the right visual field and the experiences of the right half of the body
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what other conclusions were made?
when the brain is disconnected we see two separate selves, each with its own memory and will
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Card 2

Front

what is the aim of the experiment?

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to investigate the effects of hemisphere disconnection and to show that each hemisphere has different functions

Card 3

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what is the IV of the experiment?

Back

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Card 4

Front

what was the DV of the experiment?

Back

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Card 5

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what research method was used?

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