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The recent Letter by Wissner-Gross and Freer [1] proposes a relationshipbetween intelligence and entropy maximization based on a causal generalizationof entropic forces over configuration space paths, which may beautifully inducesophisticated behaviors associated with competitive adaptation on time scalesfaster than natural evolution. These authors suggest a potentially generalthermodynamic model of adaptive behavior as a non-equilibrium process in opensystems. On the basis of the force-entropy correlations published by us adecade ago [2], we point out that their main relations have been previouslyreported within a simpler statistical thermodynamic model where non-interactingmoving 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

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