PSYCO104 Lecture Notes - Lecture 18: Endorphins, Reuptake, Frontal Lobe

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October 31 2014
TL - 11
Biological Foundations of Behaviour.
Neurons.
An individual neuron is not that complicated. They recieve a signal,
and
then may re-transmit the signal. The structure of how the neurons are
wired is from which complex behaviour rises. Act somewhat like wires.
Resting Potential
At rest, when a neuron is not being stimulated, it holds a
'resting charge'.
-70 mV. It maintains this negative charge in several ways.
Equalibrium
forces, an even distribution of all its component pieces. The
ions
inside and outside of the neuron are trying to reach balance.
At rest potassium ions are free to travel in and out of the
neuron thrugh
protien gates on the neuron's cell membrane. Typically, this
results in
more sodium ions outside than inside. There are two gates, one
for sodium
and one for potassium.
In addition, there is also a sodium/potassium pump which activly
is
transporting ions. 3 sodium out, 2 potassium in. The net result
through
both active and passive modes is more sodium out, more potassium
in.
Exterior has positive charge, interior has negative charge.
Action Potential
When a neuron is stimulated, the ion pump shuts down, the
potassium gate
closes, and the sodium gate opens. Sodium ions flood in and the
neuron
gets a +40mV charge.
Refractory Period
After the neuron has been stimulated, it must go through a phase
where
the charges rebalance to the original -70mV
Firing rate
A neuron can fire as fast as 100-1000 cycles per second.
Depending on
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