right brain/left brain
Function of the corpus
• Seizure – period of
excessive neural activity in brain or
• Epilepsy - Recurring seizures; about 1-2 in 100
people has epilepsy; ccurs in many
• May be inherited or or may
follow some injury to the brain
• In the latter case, seizures
usually begin at the injured spot (the “focus”) and it is called “focal or partial seizure”. Because the brain is so conductive, partial
seizures may spread
• Each half of your brain sees
the opposite half of your visual world
• Similarly, each half of the
brain senses and moves the opposite half of the body.
Roger Sperry –
Split Brain Patients
Left Brain Sees a Ball
• “I see a baseball”
Right Brain Sees a
left hand can select the hammer, indicating hammer was perceived but couldn’t
be verbally identified by right hemisphere.
• This is evidence for “lateralization
of function” – that is, one side of the brain having different
functions/abilities than the other side.
Left: Language, mathematics, analytical/detail
Right: Visual/spatial processing, interpreting nonverbal
sounds, voice intonation, music, recognizing and expressing emotion.
• Gazzaniga proposes the LH
provides our inner voice narrative interpretation as we try to make sense of
the world, the verbal reconstruction of our memories.
problems due to brain damage
• The greater the damage in
the vicinity of Broca’s area, the greater the difficulty producing speech:
– Both spoken & signed;
affects writing & gesturing too
– Affects the use &
understanding of grammatical words, endings, & meaning conveyed by word
– Results in “telegraphic
speech” (nouns & verbs)
• Damage to Wernicke’s area
disrupts memory of words & speech comprehension/comprehensibility:
“Wernicke’s aphasia” Can talk but not make sense.