lateralization of function

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lateralization of function

• function or behavior found in only one cerebral
  hemisphere
• why might there be lateralization?
• what are its advantages and disadvantages?

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lateralized behaviors

• left hemisphere
• analytical abilities
• quantitative skills
• language

• right hemisphere
• music
• spatial abilities
• artistic abilities
• emotions
• facial recognition

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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
be attributed to motor, motivational, sensory or
other explanations
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Brocas Aphasia

• characterized by broken halted speech,
• absence of prosody
• comprehension fairly good ability to read
  fairly good

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Wernickes aphasia

• fluid aphasia, deficits appear to be in
  comprehension words are nonsensical
• comprehension poor
• reading ability - poor

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Wada test

• injection of sodium amytal or sodium amobarbital
  anesthetic
• used to determine hemisphere important for speech

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Another way to study lateralized behaviors is via
split brain patients

• split brain surgery

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consequences of split brain

• initially
• Breakdown of the Bicameral Mind
• Julian Jaynes
• subsequently only can really tell by
  experimental manipulations in the lab

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Emotions

• emotional facial expressions
• evolutionary explanation

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Emotions

• emotional facial expressions
• evolutionary explanation
• role of right hemisphere
• recognition of emotion
• display of emotions
• chimera
• brain damaged humans

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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

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Kluver Bucy Syndrome

• Kluver Bucy syndrome
• associated with temporal lobe damage
• characteristics

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Kluver Bucy Syndrome

• Kluver Bucy syndrome
• associated with temporal lobe damage
• characteristics1. extraordinary tameness

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Kluver Bucy Syndrome

• Kluver Bucy syndrome
• associated with temporal lobe damage
• characteristics1. extraordinary tameness
• 2. lack of fear

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Kluver Bucy Syndrome

• Kluver Bucy syndrome
• associated with temporal lobe damage
• characteristics1. extraordinary tameness
• 2. lack of fear
• 3. put anything in the mouth

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Kluver Bucy Syndrome

• Kluver Bucy syndrome
• associated with temporal lobe damage
• characteristics1. extraordinary tameness
• 2. lack of fear
• 3. put anything in the mouth
• 4. mount anything