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Lecture

Neuropsychology This is the lecture outline, as provided by Dr. Ennis, with my own annotations.


Department
Psychology
Course Code
PSYCH101
Professor
Richard Ennis

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1NEUROPSYCHOLOGY
Lecture Outline
THE NEURON
We need an effective interpretation of the external world
We also need ways to interact with the world
We need to be able to interpret what is happening and react
The environment reacting with the person is an afferent process (sensation)
How we interact with the environment is an efferent process (behaviour)
The neuron more or less mediates both of these processes
Neurons are involved in the processing of information
Three Parts: Soma, Dendrites, Axon
Soma – cell body (or head of the neuron)
oContains nucleus
Dendrites extend from soma
Axons - long tail extending from the soma
oCovered with myelin sheath, separated by Nodes of Ranvier
Three Kinds: Sensory, Motor, Interneurons
All function within the central nervous system
Information comes in through the dendrites, through the soma and down the
axons
Sensory: from sensory organs to brain (eventually)
Motor neurons: allow us to perform (react) on our world
Interneurons: mostly in the brain
oDo the processing of information
Direction From
(dendrite)
To
(axon) Quantity
Sensory Neurons Afferent Sensory
Organs CNS 2 - 3 million
Motor
Neurons Efferent CNS Muscles and
Glands 2 - 3 million
Interneurons Neuron Neuron 10 - 100
billion
NEURONAL CONDUCTION
Luigi Galvani (1737 – 1798)
Discovered the galvanizing process
Studied electricity
Conducted first experiment to demonstrate brain cells communicate electrically
Dead frog legs stimulated with electricity caused muscles to contract
A suggestion was made that neurons may communicate chemically (because of
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