Passive avoidance tests.

A. Step-through passive avoidance test. The latency of the mice entering the dark compartment was recorded 24 hours after the training session. The latency of the Ca_v3.2 ^−/− mice (KO −/−) was significantly shorter than that of the WT and the Ca_v3.2 ^+/− (KO +/−) mice. Asterisk indicates p<0.01; numbers in parentheses indicate the number of animals used in this experiment. B. Step-down passive avoidance. The latency of the mice to step off the elevated platform onto the floor was recorded 24 hours after the training session. The latency of the Ca_v3.2 ^−/− (KO −/−) to step off the platform was significantly shorter than that of the WT and Ca_v3.2 ^+/− (KO +/−) mice. Asterisk indicates p<0.05; numbers in parentheses indicate the number of animals used in this experiment.