PSYC 111 Lecture Notes - Lecture 6: Corpus Callosum, Auditory Cortex, Visual Cortex

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Cerebral cortex
o Outer layer of the cerebrum
Glial cells
Support and nourish and protect the nerve cells
o Highest level of the brain's development
o Responsible for most complex functions
o Two hemispheres
Contra-lateral
Each hemisphere has four lobes
Frontal
Just behind the forehead
Involved in
Speaking
Muscle movements
Planning and making judgments
Motor cortex
Controls voluntary muscle movements on the opposite side of the
body
Sensory cortex
Helps register and process body's skin sensitive
Parietal
Occipital
Visual cortex
sight
Temporal
Auditory cortex
Sound
Brain Plasticity
o Brain damage effects
If one hemisphere is damaged early in life, other will assume many functions by
reorganizing or building new pathways
Plasticity diminishes later in life
Brain sometimes mends itself by forming new neurons through neurogenesis
o Constraint-induced therapy
Aims to rewire brains and improve dexterity of brain-damaged people
Neurogenesis
o Split brain
Corpus callosum severed
Consciousness
Studying consciousness is difficult
Dual processing
o Cognitive neuroscientists studying brain activity underlying consciousness have discovered a
"two-track human mind"
A conscious, deliberate "high road"
Deliberately thinking about what you are going to do next or how you are
feeling, etc.
An unconscious, automatic "low road"
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