Gries, Werner HugoUniversity of Pretoria. Dept. of Physics2016-11-212016-11-212016-112016-11Gries, WH 2016, 'How the Least Effort Principle governs human reasoning and behaviour', Essays on Cognitive Physical Science, Essay 4, pp. 1-28.http://hdl.handle.net/2263/58203This is Essay 4 of the Collection of 'Essays on Cognitive Physical Science' in the repository UPSpace of the University of Pretoria.Essay 4 is the first of a number of essays focussing on certain key aspects of the author's model of mind, first described in Essay 3 (hdl.handle.net/2236/50310) and again in updated - and currently only relevant - form in Essay 3.1 (hdl.handle.net/2236/58202). The Least Effort Principle is a key aspect of prime importance of the model of mind and is the main theme of Essay 4.enCopyright with the authorAuthoritiesBrain languageCollateral Learning PrincipleCollateral primingComplex dynamic systemConsciousnessCore hypothesisDirect-Access-Storage hypothesisEmergent propertyFabulatingGeniusGroupthinkHierarchic architecture of natureInformation moduleKahnemanKnowledge moduleKnowledge PrimingLawLeast Effort Principle (LEP)Least Mental Stress PrincipleModular Mental Structure ModelOpinion-beats-facts phenomenonPrimingPrivate paradigmQuantum consciousnessQuantum mindSelfSelf-righteousness of mindThought sharingThreshold Hypothesis of Consciousnessvon NeumannWigner postulateOther