Post on 21-Dec-2015
lateralization of function
• function or behavior found in only one cerebral hemisphere
• why might there be lateralization?
• what are its advantages and disadvantages?
lateralized behaviors
• left hemisphere– analytical abilities– quantitative skills– language
• right hemisphere– music– spatial abilities– artistic abilities– emotions– facial recognition
Language
• most well studied lateralized behavior– 95% of right handed
have speech on left– 70% of left handed
have speech on left
aphasia – language deficit that cannot beattributed to motor, motivational, sensory or other explanations
Broca’s Aphasia
• characterized by broken halted speech,
absence of prosody
• comprehension – fairly good; ability to read – fairly good
Wernicke’s aphasia
• fluid aphasia, deficits appear to be in comprehension; words are nonsensical
• comprehension – poor
• reading ability - poor
Wada test
• injection of sodium amytal or sodium amobarbital – anesthetic
• used to determine hemisphere important for speech
Another way to study lateralized behaviors is via “split brain” patients
• split brain surgery
consequences of “split brain”
• initially – – “Breakdown of the Bicameral Mind”
• Julian Jaynes
– subsequently – only can really tell by experimental manipulations in the lab
Emotions
• emotional facial expressions– evolutionary explanation
Emotions
• emotional facial expressions– evolutionary explanation
• role of right hemisphere– recognition of emotion – display of emotions– chimera
• brain damaged humans
brain regions involved in emotion
• limbic system- – components of limbic system- includes
hypothalamus, hippocampus, amygdala, olfactory bulbs, septum
• sits within the temporal lobe– temporal lobe epilepsy
Kluver Bucy Syndrome
• Kluver Bucy syndrome– associated with temporal lobe damage
characteristics:
Kluver Bucy Syndrome
• Kluver Bucy syndrome– associated with temporal lobe damage
characteristics:
1. extraordinary tameness
Kluver Bucy Syndrome
• Kluver Bucy syndrome– associated with temporal lobe damage
characteristics:
1. extraordinary tameness
2. lack of fear
Kluver Bucy Syndrome
• Kluver Bucy syndrome– associated with temporal lobe damage
characteristics:
1. extraordinary tameness
2. lack of fear
3. put anything in the mouth
Kluver Bucy Syndrome
• Kluver Bucy syndrome– associated with temporal lobe damage
characteristics:
1. extraordinary tameness
2. lack of fear
3. put anything in the mouth
4. mount anything