Recall and recognition in list-discrimination tasks as a function of the number of alternatives.

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Abstract
IN 2-LIST DISCRIMINATION EXPERIMENTS, RETENTION OF 20-ITEM LISTS WAS TESTED AT 3 LEVELS OF ITEM-POPULATION SIZE (STIMULUS UNCERTAINTY), WITH 3 TEST PROCEDURES. GROUP 1 HAD FREE RECALL, GROUP 2 HAD FULL RECOGNITION (ALL ALTERNATIVES PRESENT), AND GROUP 3 HAD SHORT RECOGNITION (40 ALTERNATIVES PRESENT). ALSO, THE EFFECT OF SUCCESSIVE TESTS ON THE SAME MATERIAL WAS EXAMINED. RESULTS SHOWED NO DIFFERENCE BETWEEN RECALL AND FULL RECOGNITION PERFORMANCES. SHORT RECOGNITION HAD HIGHER SCORES AT HIGH UNCERTAINTY LEVELS. RETENTION WAS STRONGLY INFLUENCED BY STIMULUS UNCERTAINTY IN ALL CASES. RECALL WAS NOT FACILITATED FOLLOWING EITHER RECOGNITION PROCEDURE. ALTHOUGH RESULTS SUGGESTED AN EFFECT OF RESPONSE UNCERTAINTY, IT WAS CONCLUDED THAT IT MAY HAVE BEEN AN ARTIFACTUAL CONSEQUENCE OF DIFFERENTIAL CHANCE BENEFITS DUE TO PARTIAL LEARNING. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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