32 Brain & Behavior IX Flashcards
1
Q
What is Callosal AGENESIS
A
BORN WITHOUT a corpus callosum
= “naturally” split-brained
2
Q
In corpus agenesis, what STRUCTURES can remain at the site of corpus callosum?
A
Probst’s bundles
= REMNANTS of corpus callosum that failed to cross midline
3
Q
Compare callosal agenesis SYMPTOMS with that of Split-Brain?
A
Callosal agenesis:
= LESS disconnection (Probst’s bundles remain?)
= EASILY NAME objects/words in EITHER visual field
= SLOW interhemispheric transmission time
4
Q
Compare the TRANSMISSION time of callosal agenesis with NORMAL people
A
Callosal agenesis = 20-30ms
Normal brains = 4-6ms
5
Q
Hypothesis for WHY people with callosal agenesis seem relatively NORMAL?
A
- COMPENSATION and neural PLASTICITY which develops EARLY, to compensate for lack of inter-hemispheric transmission
- Probst’s bundles?
