Punishment- and relief-memories varied across inbred strains, but independently from each other. (a) Thirty-eight inbred strains differed from each other with respect to both punishment- and relief-memory scores. All strains had significant punishment-memory except RAL#375, which showed a tendency. As for relief-memory, the strains RAL#486, 705, 799, 208, 365, 712 had significant scores, while strains RAL#732, 357, 335, 852, 358, 786, 730, 362, 437 showed tendencies. Box plots show the median as the midline, 25 and 75% as the box boundaries and 10 and 90% as the whiskers. From left to right N = 8, 9, 9, 23, 7, 9, 20, 11, 8, 8, 8, 8, 9, 8, 9, 9, 8, 9, 10, 8, 8, 7, 8, 8, 8, 7, 17, 8, 11, 8, 8, 9, 7, 8, 9, 8, 9, 11 for punishment- and 24, 24, 24, 25, 24, 24, 24, 26, 24, 26, 24, 25, 24, 23, 24, 24, 24, 25, 25, 24, 24, 24, 24, 24, 24, 24, 24, 24, 23, 24, 24, 25, 24, 23, 25, 24, 25, 21 for relief-memory. (b) Median punishment- versus relief-memory scores did not significantly correlate; N = 38.