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Ultrasounds produced by rats accompany decreases in intraspecific fighting
Author(s) -
Lore Richard,
Flannelly Kevin,
Farina Phillip
Publication year - 1976
Publication title -
aggressive behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.223
H-Index - 92
eISSN - 1098-2337
pISSN - 0096-140X
DOI - 10.1002/1098-2337(1976)2:3<175::aid-ab2480020302>3.0.co;2-7
Subject(s) - aggression , intraspecific competition , body weight , psychology , agonistic behaviour , cage , audiology , zoology , developmental psychology , medicine , biology , endocrinology , engineering , structural engineering
Male intruder rats were placed individually into the cage of an established resident on 2 occasions separated by a 7–8 day interval. Residents readily attacked intruders and both animals lost weight during the first encounter. In contrast, no serious fighting occurred on the second encounter, and both intruders and residents maintained their body weight during the 24‐hr test. Observation of the intruder's behavior during the first 30 min of each encounter indicated that defensive‐submissive postures represent a response to an attack that only temporarily inhibits aggression whereas the emission of 22 kHz calls by the intruder is associated with a relatively permanent decrease in the resident animal's aggressive response.