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(A) Vocalization intensity during the isolation test in 10-s intervals (mean ± s.e.m.). Asterisks represent significant difference between VPA and control groups. Hash mark denotes significant difference compared to the previous 10-s intervals in both experimental groups. (B) Frequency of distress calls (DCs) during the isolation test (mean ± s.e.m.). Asterisks represent significant difference between VPA and control groups.
