TY - RPRT TI - 22kHz Ultrasonic Vocalizations and Body Freezing May Represent Two Systems of Fear in Rodent Fear Conditioning Paradigms AU - Zheng, B. AU - Bao, L. AU - Yu, D. AU - Yin, B. PY - 2023 DO - 10.1101/2023.06.02.543520 UR - https://www.biorxiv.org/content/10.1101/2023.06.02.543520v1 ID - 10.1101/2023.06.02.543520 ER -