Comment on Phys. Rev. Lett. 110, 168702 (2013): Causal Entropic Forces

The recent Letter by Wissner-Gross and Freer [1] proposes a relationship between intelligence and entropy maximization based on a causal generalization of entropic forces over configuration space paths, which may beautifully induce sophisticated behaviors associated with competitive adaptation on time scales faster than natural evolution. These authors suggest a potentially general thermodynamic model of adaptive behavior as a non-equilibrium process in open systems. On the basis of the force-entropy correlations published by us a decade ago [2], we point out that their main relations have been previously reported within a simpler statistical thermodynamic model where non-interacting moving particles are assumed to form an elastic body. [1] A.D. Wissner-Gross and C.E. Free, Phys. Rev. Lett. 110 (2013) 168702 [2] E. Canessa, Physica A 341 (2004) 165 -also at arXiv:cond-mat/0403724