“…This memory-retrieval interpretation of the Kamin effect appears capable of explaining those cases in which more active responding is seen at intermediate intervals (Bintz, 1970;Bintz, Braud, & Brown, 1970;Klein & Spear, 1970a, 1970bPinel & Cooper, 1966;Ross, 1975 ;Singh, Sakellaris, & Brush, 1971) as well as the more typical finding of less active responding. Such an interpretation has been suggested in various forms by several authors (Bintz et al, 1970;Brush, 1971;Klein, 1972;Spear, 1971Spear, , 1973. However, the failure to find a Kamin effect when retention of discrimination learning was measured in terms of choices, in spite of the simultaneous occurrence of the effect in terms of response latencies (Barrett et al, 1971b;Steranka & Barrett, 1973), would suggest a performance rather than a memorial interpretation of the phenomenon.…”