Decay

Definition and stakes

Th. Ribot The Psychology of the Emotions (1897)

The law of decay, in psychology, consists in a continuous retrogression, descending from the higher to the lower, from the complex to the simple, from the unstable to the stable, from the most to the least organised; in other words, those manifestations which are the latest in date of evolution are the first to disappear; while those which were the first to appear are the last to vanish. Evolution and decay follow opposite courses.
Source: Gutenberg

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