PSYB65-Lecture 1 Notes

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Lecture 1-PSYB65
x Nervous system (2 components)
o Peripheral nervous system
๎‚ƒ all other nerves
o Central nervous system
๎‚ƒ Brain
๎‚ƒ 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
๎‚ƒ Most anterior portion of the brain
๎‚ƒ Human brain is mostly forebrain by mass
๎‚ƒ Human evolution has favoured it
๎‚ƒ ๎€’๎€žv๎‚š๎‚Œ๎€‚o๎€ƒ๎‚‰}๎‚Œ๎‚š]}vW๎€ƒ๎‚šZ๎€‚o๎€‚uยต๎‚Y~๎€๎€žv๎€ž๎€‚๎‚šZ๎€ƒ]๎‚š๎€ƒ]๎‚๎€ƒ๎‚šZ๎€ž๎€ƒ
hypothalamus)
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
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relaying because cortex is small
๎‚ƒ Hypothalamus (not single structure, instead is a system)
x ๎€’}v๎‚š๎‚Œ}o๎‚๎€ƒo](๎€ž๎€ƒ(ยตv๎€๎‚š]}v๎‚Yl๎€ž๎€ž๎‚‰๎‚๎€ƒ๎‚๎‚‰๎€ž๎€]๎€ž๎‚๎€ƒ๎€‚o]ร€๎€ž๎€ƒ]X๎€žX๎€ƒ๎‚šZ]๎‚Œ๎‚๎‚šU๎€ƒ
hunger, territoriality, sexual behaviour
x Makes you feel good (i.e. eating, drinking, sexual
activity, cocaine stimulates this part of the brain)
๎‚ƒ 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
๎‚ƒ Cerebral Cortex
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