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PSYB65-Lecture 1 Notes

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Ted Petit

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Lecture 1-PSYB65
x Nervous system (2 components)
o Peripheral nervous system
all other nerves
o Central nervous system
Spinal cord
x Gradual change from brain to spinal cord (no dividing line)
x Human brain identical to rats, cats, etc.
x 3 basic parts to a brain:
o Forebrain
Most anterior portion of the brain
Human brain is mostly forebrain by mass
Human evolution has favoured it
x Major relay centre (important in humans and higher
mammals because we have big cortex)
x we needed to have relay centre to convey info to
right place in neocortex
x Info from every sensory system in body stops in the
thalamus and is relayed to right place in neocortex
x /v]u]]Àv]uoUZouµ}v[}uµZ
relaying because cortex is small
Hypothalamus (not single structure, instead is a system)
x }v}oo]((µv]}vYl]o]À]XXZ]U
hunger, territoriality, sexual behaviour
x Makes you feel good (i.e. eating, drinking, sexual
activity, cocaine stimulates this part of the brain)
Limbic system (made up of a number of structures)
x Animals have different sizes of limbic system i.e.
snake vs. dog
x Deals with emotions and emotionality
x Amygoala
x Hippocampus
x Hypothalamus
Cerebral Cortex
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