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Lecture

PSYC 1010 Lecture Notes - Corpus Callosum, Action Potential, Autonomic Nervous System


Department
Psychology
Course Code
PSYC 1010
Professor
Rebecca Jubis

Page:
of 3
Biological Basis of Behaviour
Biological Approach
Argues that to understand behaviour, we must examine the brain and nervous system. An underlying
assumption is that for every thought or behaviour, there’s a corresponding physical event taking place in
the brain.
Penfield - “Brain Mapping” (m.n.)
Cortex
Region of the brain surrounding the , which is involved in complex thinking.
Corpus callosum
Tissue connecting the two hemispheres of the brain, allowing them to communicate.
Right hemisphere Creative behaviour
Left Hemisphere Cognitive abilities, speaking, writing, reading, calculating
Stan Coren
10 15% of population is left handed
By age of 21, one third have died
By age 50, decrease to 5% of population
More left handed people suffer from immune disease
Left handed people make up 45 to 55 of the lesbian/gay community
Higher rate of left handedness in twins
More left handed people become alcoholics
Ambidexterous: Ability to use both hands
Right Handed
Left Handed
Speech in left
92 %
69%
Speech in Right
7%
18%
Speech in Both
1%
13%
Neuron
Resting Potential (m.n)
Action Potential: When a resting neuron’s stimulated by another neuron, a surge of electrical energy
moves down the axon
How do messages travel across the synapse?
Neurotransmitters
Nervous System
Central
Nervous
System
Peripheral Nervous System
Somatic nervous
System (sensory and
motor nerves,
voluntary)
Autonomic Nervous System
(internal systems, involuntary)
Sympathetic
division ("trouble
shooter")
Parasympatheitc
division
("housekeeping")
Agonists: Drugs that mimic the effect a neurotransmitter
Antagonists: Drugs given to prevent a particular neurotransmitter from binding to the post synaptic
membrane
Whether or not the post synaptic membrane fires or not depends upon:
a) The total number of messages or impulses it receives
b) The type of message it receives
Excitatory or inhibitory neurons
Neurons add and subtract excitatory and inhibitory messages. The net total determines how the neuron
will respond