title: Mechanisms of same/different abstract-concept learning by rhesus monkeys (Macaca mulatta).
abstract: Experiments with 9 rhesus monkeys (Macaca mulatta) showed, for the first time, that abstract-concept learning varied with the training stimulus set size. In a same/different task, monkeys required to touch a top picture before choosing a bottom picture (same) or white rectangle (different) learned rapidly. Monkeys not required to touch the top picture or presented with the top picture for a fixed time learned slowly or not at all. No abstract-concept learning occurred after 8-item training but progressively improved with larger set sizes and was complete following 128-item training. A control monkey with a constant 8-item set ruled out repeated training and testing. Contrary to the unique-species account, it is argued that different species have quantitative, not qualitative, differences in abstract-concept learning.
authors.affiliation: Department of Psychology, Auburn University, 226 Thach Hall, Auburn, Alabama 36849, USA. katzjef@auburn.edu
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Katz
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Wright
authors.forename: Jocelyne
authors.initials: J
authors.lastname: Bachevalier
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001288:Attention; D003210:Concept Formation; D004193:Discrimination Learning; D005260:Female; D008253:Macaca mulatta; D008297:Male; D011939:Mental Recall; D010775:Photic Stimulation; D011597:Psychomotor Performance; D012718:Set, Psychology; D013997:Time Factors; D014163:Transfer, Psychology; D014796:Visual Perception