Sperry 1968

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  • Sperry 1968
    • Aims
      • Investigate disconnection of the corpus callosum
      • show each hemisphere has own functions.
    • Method
      • Laboratory tests.
      • Quasi Experiment comparing split brain patients with 'normal' people
    • Participants
      • 11 Split Brain patients
        • Already undergone surgery to split their brains due to epilepsy
    • Procedure
      • 12 tests were carried out
        • Recognition of visual stimuli presented to hemispheres separately
          • Pics of the objects were only recognised if they were re-flashed into the same VF
        • Tactual recognition
          • P can retrieve the objects, but the right hand can only recognise what it held and left hand can only recognise what it held
        • Crossed topognosis test and cross integration test
          • Ps couldn’t identify they place in the cross-integration test.
        • Tests of right hemisphere function
          • For last test, P couldn’t not state they had seen anything other than shapes.
        • Recognition of visual stimuli presented to left and right hemisphere simultaneously
          • The P would draw what they had seen with their LVF and say that they had drawn what they had seen through their RVF.
        • Recognition of pairs of related words presented visually and simultaneously to left and right hemispheres
          • Example of KEYCASE: KEY=LVF CASE=RVF, Key could be selected by the left hand and CASE would be written by the right hand.
    • Conclusions
      • Brain consists of two separate hemispheres.
      • The corpus callosum transfers infro between hemispheres
      • The left hemisphere is dominant as it contains the speech centres
      • Seperate consciousness could be possible as when thr RH saw a naked lady they giggled but they couldnt say why.


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