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Bioacoustics article in J Comp Psychol

Subject: Bioacoustics article in J Comp Psychol
From: a9403658 <>
Date: Fri, 07 Nov 2003 11:33:41 -0800
 Bloomfield, Laurie L., Christopher B. Sturdy, Leslie S. Phillmore, and 
 Ronald G. Weisman. 2003. Open-ended categorization of chick-a-
 dee calls by Black-Capped Chickadees (Poecile atricapilla). pp. 
 The authors trained black-capped chickadees (Poecile atricapilla) in 
 an operant discrimination with exemplars of black-capped and 
 Carolina chick-a-dee calls, with the goal of determining whether the 
 birds memorized the calls of conspecifics and heterospecifics or 
 classified the calls by species. Black-capped calls served as both 
 rewarded (S+) and unrewarded (S-) stimuli (the within-category 
 discrimination), whereas Carolina chick-a-dee calls served as S-s 
 (the between-category discrimination) in the black-capped chick-a-
 dee call S+ group. The Carolina call S+ group had Carolina calls as 
 S+s and S-s (within-category) and black-capped calls as S-s 
 (between-category). Both groups discriminated between call 
 categories faster than within a call category. In 2 subsequent 
 experiments, both S+ groups showed transfer to novel calls and 
 propagation back to between-category calls. The results favor the 
 hypothesis that the acoustically similar social calls of the 2 species 
 constitute separate open-ended categories. 
 Mag. Lidia Eva Wysocki
 Institute of Zoology, University of Vienna
 Althanstrasse 14
 A-1090 Vienna, Austria
 Phone: ++43-1-4277/54515
 Fax: ++43-1-4277-9544

>From  Wed, 12 Nov 2003 13:55:52 -0800
From: Jill Soha <>
Date: Wed, 12 Nov 2003 13:55:52 -0800
Subject: Bird song paper in Condor (Nov 2003)

Vol: 105, Issue: 4, November 1, 2003
 pp. 672-682
 Mann, Nigel I.; Marshall-Ball, Lorraine; Slater, Peter J. B.
 We studied the duet of the Caribbean-slope subspecies of the Plain
 Wren (Thryothorus modestus zeledoni ) in Costa Rica. It is one of the
 most complex duets to have been described. The duet proper consists of
 rapid, highly coordinated alternation of "A-phrases" from the female
 and "B-phrases" from the male. While the female initiates this section
 with her A-phrase, this cyclical part of the duet is almost invariably
 preceded by an introductory "I-phrase" from the male, so that it is
 the male that initiates the performance. Each male has a repertoire of
 I- and B-phrases, and each female has a repertoire of A-phrases. These
 are specifically associated with each other to form a repertoire of
 duet types. We hypothesize that the pattern of song organization in
 this species facilitates more coordinated and precise duetting. The
 presence of the three components means that a full duet requires the
 cooperation of both members of the pair, strongly suggesting that it
 represents a mutually beneficial signal.
 Dr. Jill Soha, Curator
 Borror Laboratory of Bioacoustics (<a  href=""; 
 The Ohio State University Museum of Biological Diversity
 1315 Kinnear Road, Columbus, OH  43212    (614) 292-2176

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