| Abstract: | EACH OF 160 UNDERGRADUATES MADE 400 2-CHOICE PREDICTIONS WHICH CONSISTED OF A RANDOM SEQUENCE OF HIGH- AND LOW-RISK TRIALS. 8 GROUPS WERE FORMED BY VARYING EVENT FREQUENCIES UNDER BOTH RISK LEVELS. CHOICE PROPORTIONS REVEALED A STRONG OVERALL INCENTIVE EFFECT WITHIN-SS, WHEREAS BETWEEN-SS INCENTIVE STUDIES HAVE GENERALLY FAILED TO SHOW DIFFERENCES. CHOICE PROPORTIONS UNDER EACH INCENTIVE LEVEL WERE RELATED TO EVENT FREQUENCIES UNDER THE 2ND INCENTIVE LEVEL. SUBJECTIVE ESTIMATES OF EVENT PROPORTIONS ALSO SHOWED AN INCENTIVE EFFECT. OBSERVED CONDITIONAL STATISTICS WERE FOUND TO BE AT VARIANCE WITH BASIC REINFORCEMENT ASSUMPTIONS CONTAINED IN SEVERAL MATHEMATICAL MODELS OF CHOICE BEHAVIOR. (FRENCH SUMMARY) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
