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I have now to consider how far the all-or-none principle applies to the process of suppression which forms so important an element in the reaction to danger by means of immobility and in that of manipulative activity.
The idea that the all-or-none principle holds good of instinct, at any rate in its more primitive and cruder forms, was supported by the nature of primitive sensibility as revealed by the experiments of Head.
I hope to show later that the all-or-none principle tends to reappear in disease, when the process of regression reduces mental activity to a state comparable with that which it possessed at an early stage of its development.