(Lesson 9 2013) split brain studies
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  • 1. Nothing  on  your  left!  Damage  to  the  right!  
  • 2. From  last  lesson….  Question  1  Charlotte  is  diagnosed  with  Broca’s  aphasia.    a.  Where  is  Broca’s  area  located?  (1  mark)    b.  Describe  two  ways  in  which  her  speech  could  be   impaired.  (2  marks)  
  • 3.  Charlotte  is  diagnosed  with  Broca’s  aphasia.    a.  Where  is  Broca’s  area  located?  (1  mark)    Frontal  lobe  in  the  left  hemisphere.    Both  pieces  of  information  were  required.  Students  did  not  need  to  state  that  this  is  so  more  than  95  per  cent  of  the  time.  b.  Describe  two  ways  in  which  her  speech  could  be  impaired.  (2  marks)    Any  two  of:    •  produces  very  little  speech    •  speech  requires  much  concentration  and  effort    •  difficulty  articulating  speech  (pronouncing  words)    •  speech  tends  to  be  slow  and  drawn  out    •  short  words  –  prepositions/conjunctions  tend  to  be  omitted    •  sentences  tend  to  be  very  short  (up  to  four  words)    •  sentences  tend  to  be  made  up  of  verbs  and  nouns  only    •  words  lack  grammatical  endings  (for  example,  –ing).    A  common  error  was  to  list  two  descriptors  of  the  same  difficulty;  for  example,  speech  is  slurred  and  poorly  articulated;  or  words  are  shortened  and  words  lack  grammatical  endings.  Such  responses  received  only  one  mark.  
  • 4. This  lesson…..    Describe  split-­‐brain  studies  including  the  work  of  Roger   Sperry  and  Michael  Gazzaniga    Describe  spatial  neglect  caused  by  stroke  or  brain   injury    Explain  the  contribution  of  split-­‐brain  studies  to  our   understanding  cognitive  processes    
  • 5. Neglect  syndrome    Damage  to  the  right  parietal  lobe    Results  in  the  patient  completely  ignoring  the  left  side   of  their  world,  even  the  left  side  of  their  body.    Patients  eat  only  the  food  on  the  right  side  of  their   plate,  shave  the  right  side  of  their  face,  wash  the  right   side  of  their  body  etc.    A  problem  of  attention,  not  blindness!  
  • 6. What  do  you  mean  there’s  something  wrong  with  my   face?  
  • 7. Sounds  cool  until  your  brain  is  cut  in  half  
  • 8. Corpus  Callosum  The  corpus  callosum  forms  a  bridge  that  connects  the  left  and  right  hemispheres.    The  corpus  callosum  enables  communication  between  the  two  hemisperes  
  • 9. Split  Brain  Surgery     Severing  the  Corpus   Callosum     Used  to  treat  severe  epilepsy     Disables  communication   between  the  left  and  right   hemispheres  
  • 10.   Information  from  left  visual  field  is   processed  in  the  right  hemisphere    Information  from  the  right  visual   field  is  processed  in  the  left   hemisphere  
  • 11. Split  Brain  Test     Object  presented  to  left   visual  field  (processed  in   right  hemisphere)     Cannot  name  object       Can  pick  correct  object  up     Object  presented  to  right   visual  field  (processed  in  left   hemisphere)     Can  name  object     Conclusion  –  language   processing  occurs  on  LEFT