Document Detail

Sonographic structure of isolation-induced ultrasonic calls of rat pups.
MedLine Citation:
PMID:  10204095     Owner:  NLM     Status:  MEDLINE    
Sonographic analysis of isolation-induced calls of 10- to 17-day-old Sprague-Dawley rat pups showed that average acoustic parameters of calls changed with pups' age. Average call duration increased with age from 80 ms to over 140 ms in 15-day-old pups. The peak frequency increased from approximately 50 kHz to an average of 64 kHz in 17-day-old pups, and the average bandwidth increased from 34 to 45 kHz in 17-day-old pups. Analysis of the sonographic structure of pup calls additionally revealed a tendency to produce two or more alternating sweeps of sound frequency in each call. Development of sweeps is the most typical feature of pup calls with a dominant call type resembling "U" or inverted "U" shape in the sonogram. Number of "U" or inverted "U" call types significantly increased with pups' age. It is concluded that pups developed and strengthened those acoustic features of distress calls which play a role in intraspecific communication and maximize pup survival.
S M Brudzynski; P Kehoe; M Callahan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Developmental psychobiology     Volume:  34     ISSN:  0012-1630     ISO Abbreviation:  Dev Psychobiol     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-06-02     Completed Date:  1999-06-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  195-204     Citation Subset:  IM    
Department of Psychology, Brock University, St. Catharines, Ontario, Canada.
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MeSH Terms
Adaptation, Psychological / physiology*
Age Factors
Analysis of Variance
Animals, Newborn
Arousal / physiology
Behavior, Animal / physiology*
Chi-Square Distribution
Maternal Deprivation*
Rats, Sprague-Dawley
Sound Spectrography*
Stress, Psychological / psychology*
Vocalization, Animal*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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