title: Opportunity cost calculations only determine justified effort--or, what happened to the resource conservation principle?
abstract: We welcome the development of a new model on effort and performance and the critique on existing resource-based models. However, considering the vast evidence for the significant impact of experienced task demand on resource allocation, we conclude that Kurzban et al.'s opportunity cost model is only valid for one performance condition: if task demand is unknown or unspecified.
authors.affiliation: Geneva Motivation Lab, FPSE, Department of Psychology, University of Geneva, CH-1211 Geneva 4, Switzerland. guido.gendolla@unige.ch michael.richter@unige.ch http://www.unige.ch/fapse/motivation/
authors.forename: Guido H E
authors.initials: GH
authors.lastname: Gendolla
authors.forename: Michael
authors.initials: M
authors.lastname: Richter
mesh_terms: D006801:Humans; D005222:Mental Fatigue / Q000523:psychology*; D008960:Models, Psychological