Hwang model

Reaction coordinate (negative free energy change)
Reaction coordinate showing two possible directions of spontaneous reactions; the region in red depicting an exergonic reaction, quantified by a negative change (ΔG < 0) in the value of the Gibbs free energy of the reaction of products on going to reactants. [1]
In human chemistry, Hwang model or "Hwang free energy principle" states that []

In 2001, David Hwang, in his article "The Thermodynamics of Love", stated, in the context of a typical mate selection human combination reaction, such as in the process of two people falling in love or the process of a full human reproduction reaction, that: [1]

“If the male-female reaction has a negative free energy, then it is expected that the system will spend most of its time together as a strong couple.”

The principle is an extension of spontaneity criterion applied to human chemical reactions, in short. [2]

1. Thims, Libb. (2007). Human Chemistry (Volume One) (Hwang free energy principle, pg. 117; graph, pg. 113). Morrisville, NC: LuLu.
2. Hwang, David. (2001). "The Thermodynamics of Love" (PDF), Journal of Hybrid Vigor, Issue 1, Emory University.

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