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all-or-none phenomenon

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all-or-none phenomenon
All-or-nothing principle, all-or-none response Cardiac physiology The property of cardiac muscle in which stimulation from a single myocyte travels to the atrium and ventricle before contracting, resulting in a coherent and coordinated pump activity. See Action potential Physiology A rule applied to the activation of individual muscle or nerve cells, where the response to stimuli–depolarization only occurs above a certain threshold, usually –55 mV, after which a complete action potential occurs which is maximum in intensity, ie the strength of the nerve impulse is not dependent on or a function of the strength of the stimulus Psychology A 'soft' rule in behavioral studies, which refers to the observation that a behavioral stimulus will produce either a complete response or none at all.


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Susan Greenfield has explained that one should not think of consciousness as an all-or-none phenomenon but rather that it may come on like a dimmer switch.
 
 
 
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