A comparison of S+ and S2212 depression effects in differential conditioning

摘要: A.total of 240 albino rats, across two experiments, receIved reward magnitude (differential or n~md.iff~re~tial) training in a nonchoice brightness dlscnmInatlOn apparatus. Results indicated significant S+ and S- depression effects showed that variability (among Ss) performance to was greater than for the differentially rewarded Ss. Transformed ?pe~ds, taking into account discrepant variances, mdlcated comparable effects. The results were discussed terms current models differential conditioning. In finding rats receiving is depressed small (S-) stimulus relative condition receives both discriminanda well documented has received considerable theoretical attention (cf. Black, 1968; McHose, 1970). similar observation large (S+) stirn ul us. speeds being those group "S+" "S-," only recently primary 1970: Perkins, There are several possibilities this earlier neglect. First, early investigators. perhaps influenced by perception literature. interested symmetrical contrast effects, elated speeds; thus, equal may have been viewed as failure demonstrate Dunham, 1968). graphical differences these yet another factor responsible emphasis on depression, based mean speed differences. much smaller comparison (Gavelek & MacKinnon. 1967: Matsumoto, 1969). Also, initial investigation