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This Week in The Journal

amplitude of frequency modulation was greater in pup than in adult calls and that auditory cortical neurons of mice with maternal ex-perience preferred calls with greater frequency modulation than neurons of inexperienced mice. These results suggest that neurons in primary and secondary auditory cortex of mice are responsive to the frequency trajectory of calls and that maternal experi-ence increases the responsiveness of neurons to pup calls. Future work should determine how responsiveness to frequency trajectory is produced and how it is altered by maternal experience.