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. 2013 Oct 20;1(5):e00100. doi: 10.1002/phy2.100

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© 2013 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society

Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.

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Maternal separation-induced distress ultrasonic vocalizations were measured in wild-type and BRAT rats during the first 12 days of life. USVs were analyzed for (A) number of calls, (B) intercall interval, (C) call power, and (D) call duration. There was a trend toward a reduction in call frequency in BRAT rats on postnatal day 12. There was also a significant increase in intercall interval that was accompanied by a reduction in call power on postnatal days 9 and 12. No change was observed in call duration (^†P < 0.1, *P < 0.05, **P < 0.01).