Lecture 13: Review

Question 1

What happens if you lesion the left inferior frontal gyrus?

Answer 1

• Disconnection from the right motor region
  
  • right hemiplegia
  • Broca’s aphasia
  • can’t carry out verbal commands with the intact left hand
  • sympathetic dyspraxia
    
    • no comprehension deficits

Question 2

What happens if you lesion the left arcuate faciculus?

Answer 2

• Failure to carry out correct motor commands with either left or right limbs
  
  • Section of the language “audio-motor” pathway
  • Connects Audio to motor areas
• Also affect visual cortex so imitation would be affected

Question 3

What happens if you lesion the anterior CC?

Answer 3

• Disconnection of premotor regions
  
  • can carry verbal commands with right hand but not with left
    
    • write right but not left
      
      • Left:
        
        • aphasic writing
  • Can imitate perfectly

Question 4

What happens if you lesion the temporo-parieto-occipital junction?

Answer 4

• Extensive lesions
• Semantic information
  
  • ideational apraxia

Question 5

What is apperceptive agnosia?

Answer 5

• Problem with perception encoding
• Similar to blind
• Can’t
  
  • integrate parts of an image into a whole
  • copy images
• Can
  
  • Appropriately reach or grab objects
• Lesions:
  
  • bilateral infero-occipto-temporal lesion

Question 6

What is the difference between constructive apraxia and apperceptive agnosia?

Answer 6

• Constructional apraxia
  
  • Spatial relationship between objects in time (parietal)
• Apperceptive agnosia
  
  • Integration of the parts of an object into a whole (visual path)