Psychology – Gleitman
This entire sequence of
electrical evets is called the action potential.
The all-or-none law:
One point must be stressed. Size of the reaction is unaffected by the intensity of the stimulus, once the stimulus is a t threshold level or above. Increasing the
stimulus value above this level will not increase the intensity of the action potential or affect its speed of conduction to other points in the fiber. This phenomenon
is sometimes referred to as the allornone-law of neuron stimulation. The all-or-none law clearly implies that the stimulus does not provide the energy for the
nervous impulse. It serves as a trigger and no more. Given that the trigger is pulled hard enough , pulling yet harder has no effec. Like a gun, a neuron either fires
or does not fire. it knows no in-between.
The number of neurons stimulated: in many cases what happens is that more intense stimulus excites a greater number of neurons. This is precisely what we
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