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Brevity is not always a virtue in primate communication
Bruna M Bezerra1, Antonio S Souto, Andrew N Radford
1School of Biological Sciences, University of Bristol, , Woodland Road, Bristol BS8 1UG, UK.
Biology Letters
|June 25, 2010
Summary
The law of brevity, suggesting shorter animal vocalizations are more frequent, was not supported in marmosets or uakaris. Signal duration
Area of Science:
- * Primate communication
- * Bioacoustics
- * Animal behavior
Background:
- * The 'law of brevity' posits an inverse relationship between signal length and usage frequency, proposed to apply to both human language and non-human primate vocalizations due to coding efficiency.
- * This law suggests that shorter signals are used more often because they are more efficient.
Purpose of the Study:
- * To test the 'law of brevity' in the vocal communication of two Neotropical primate species: the common marmoset (Callithrix jacchus) and the golden-backed uakari (Cacajao melanocephalus).
- * To investigate the relationship between signal duration and frequency of use in primate vocal repertoires.
Main Methods:
- * Field studies were conducted on wild populations of common marmosets and golden-backed uakaris.
- * Vocal repertoires of both species were analyzed to record and quantify the frequency of use of signals with varying durations.
Main Results:
- * The 'law of brevity' prediction was not supported in either the common marmoset or the golden-backed uakari.
- * While the most frequent calls were relatively brief, they were not the shortest signals within the species' repertoires.
- * Signal frequency was not solely determined by duration; other factors influence usage.
Conclusions:
- * The 'law of brevity' does not universally apply to primate vocal communication.
- * The frequency of signal use is influenced by a balance of costs and benefits, including signal ambiguity, information content, and detectability, which vary by species.
- * Direct analogies between human language efficiency and animal communication frequency can be misleading.
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