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Average 50 kHz ultrasonic vocalizations observed per trial in the two groups of animals (shifted versus unshifted) during the uncued runway task. The days represented are the final preshift day as well as six postshift test days (Mann-Whitney U test for between group analysis; *= p<0.05; **= p<0.01 and *** = p<0.001; bars denote standard error of the mean).
