Landauer's Principle
Any logically irreversible manipulation of information, such as the erasure of a bit or the merging of two computation paths, must be accompanied by a corresponding entropy increase in non-information bearing degrees of freedom of the information processing apparatus or its environment.
Attempts to show that the arrow of computation - and by analogy, the human psychological arrow - generally appeal to the above principle formulated by Rolf Landauer in a 1961 paper (see citation). This is implicit in the case of Stephen Hawking and explicit in Schulman's paper, cited in the parent node.
However in the attached
OpposingArgument node, O.J.E. Maroney of the Perimeter Institute of Physics argues that the derivation of Landauer's Principle presumes an entropy increasing universe and that if a decreasing entropy universe is assumed, the principle reverses. Hence the attempt to bind the psychological and thermodynamic arrows using information theory fails.