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FWD: recent publication

Subject: FWD: recent publication
From: Dave Mellinger <>
Date: Mon, 20 Oct 2003 14:01:43 -0700
 Branstetter, B. K., Mevissen, S, J., Herman, L, M., Pack, A. A.,
 Roberts, S. P. (2003).  Horizontal angular discrimination by an
 echolocating bottlenose dolphin (Tursiops truncatus).  
 Bioacoustics 14, 15-34. 
 A bottlenose dolphin was tested on its ability to echoically
 discriminate horizontal angular differences between two arrays of
 vertically oriented air-filled, PVC rods.   The blindfolded dolphin was
 required to station in a submerged, vertically oriented hoop, 2 radial
 meters from the stimuli, and indicate whether an array with four rods
 (S+) was to the left or the right of an array with two rods (S-) by
 pressing a corresponding paddle.  The angular separation between the
 rods within each array (qw) was maintained at 2 degrees but the angular
 separation between the two arrays (qb) was varied to produce angular
 differences (Dq= qb-qw) ranging from 0.25 degrees to 4 degrees.  A
 modified  method of constant stimuli was used to test for angular
 discrimination ability, and yielded a psychometric function having a 75%
 correct threshold of 1.6 degrees.  This threshold fell between the
 passive listening minimum audible angle thresholds of 0.9 degrees for
 click signals and 2.1 degrees for a pure tone signal (Renaud & Popper
 1975).  Analysis of  response times, number of clicks and inter-click
 intervals failed to detect any significant adaptive behavior occurring
 as the task became more difficult.  These results help to define angular
 resolution capabilities of dolphin sonar that may play an important role
 in representing spatial information in the dolphin's environment.
 Please contact [EMAIL PROTECTED] for reprint requests.

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