In psychological thermodynamics, psychological entropy, a synonym or variant of psychic entropy, is an extrapolation of entropy in the context of psychology or of the mechanical equivalence of heat effects connected to mental activity and its related movement transformations involved during human-human interactions. [1]

The term was used, in a sense of allegory, in the 1921 socio-political novel We by Russian engineer Yevgeny Zamyatin. [2]

References
1. Thims, Libb. (2007). Human Chemistry (Volume Two), (term: psychological entropy, pg. 665) (preview), (Google books). Morrisville, NC: LuLu.
2. Zamyatin, Yevgeny. (1921). We (contents, pgs. v-ix; introduction, pg. xi-xxviii; Record 38: Both Women ● Entropy and Energy ● Opaque Part of the Body, pgs. 154-162; term: psychological entropy, pg. 169). Penguin.

Further reading
● Tyson, Lois. (1994). Psychological Politics of the American Dream (term: psychological entropy, pg. 104). Ohio State University Press.
● Nicoll, Maurice. (1996). Psychological Commentaries on the Teaching of Gurdjieff and Ouspensky (term: psychological entropy, pg. 667). Weiser.
● Iguchi, Nobuhiro and Nishihara, Tadashi. (1996). “Analysis of Environmental Morphologies Using Psychological Entropy.” Department of Mechanical Engineering.
● Sexton, Timothy. (2008). “The Concept of Psychological Entropy”, Associated Content News, Sept. 02.