Lec 3 Hemispheric Specialization Flashcards
What is the Wada Test?
Injection of amobarbital into the left common carotid artery to put ipsilateral hemisphere into brief sleep then test on language and memory tasks
What does homotopic mean?
Signal sent from one hemisphere to the same area in the other hemisphere
What does heterotopic mean?
Signal sent from one hemisphere to a different area in the other hemisphere
What does ipsilateral mean?
Signal sent from one hemisphere to a different area in the same hemisphere as well as the other hemisphere
What is the effect right hemisphere lesions have on facial expression?
Can spontaneously smile but can only consciously smile right side (only LH can voluntary facial expression)
What is the effect that damage to the midbrain has on facial expression (like Parkinson’s)?
Cannot smile spontaneously but can smile when asked to (consciously)
What evidence supports the idea that the left hemisphere is the interpreter?
Recognition test –> falsely recognised related pictures as part of the original story
What evidence supports the idea that the right hemisphere is the interpreter?
Recognition test –> can recognise new images and related images that are not part of original story
Splitbrain: When visual stimulus is presented to LVF, how does particpant respond?
Goes to right hemisphere. Cannot name the object (language), can draw it (object recognition)
What is Akinetopsia?
Lesion in CNS. Fail to percieve motion smoothly
What is Blindsight?
Damage to the primary visual cortex. Remaining visual abilities within a field defect in the absence of awareness
What is the difference between memory loss and visual agnosia?
Visual agnosia: loss of object recognition (can recognise with other senses) Memory loss: Can not remember, even with other senses
What is apperceptive agnosia?
Can not recognise objects from an unusual viewpoint
What is integrative agnosia?
Can reproduce drawings of objects however, as a whole rather than the separate parts. Failure to link parts into recognisable wholes.
What is associative agnosia?
Can recognise objects, but not what they are used for
