Suppression of mouse-killing was produced following pairings of mouse-presentations (CS) with 96 roentgens of ionizing radiation (US) at 0 (< 2 min.) and 30 min. US-CS interstimulus intervals. No suppression was found at CS-US intervals of 30 min., 1 hr., and 2 hr., or at US-CS intervals of 1 hr. and 2 hr.
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