[MARMAM] MARMAM] New publication: Relative quantity judgments in the beluga whale ( Delphinapterus leucas) and the bottlenose dolphin (Tursiops truncatus).

José Francisco Zamorano Abramson zabramson at psi.ucm.es
Wed May 15 02:48:39 PDT 2013

Dear colleagues: we are pleased to announce the recent publication of the
following paper:

Abramson, J. Z., Hernández-Lloreda, V., Call, J., & Colmenares, F. (2013).
Relative quantity judgments in the beluga whale (*Delphinapterus leucas*)
and the bottlenose dolphin (*Tursiops truncatus*).*Behavioural Processes*.
96. pp. 11-19 http://dx.doi.org/10.1016/j.beproc.2013.02.006

The article has just been published and is available on Elsevier:


Please feel free to contact me with any questions about this article.
Best regards,

 José Z. Abramson.


Numerous studies have documented the ability of many species to make
relative quantity judgments using an analogue magnitude system. We
investigated whether one beluga whale, *Delphinapterus leucas*, and three
bottlenose dolphins, *Tursiops truncatus*, were capable of selecting the
larger of two sets of quantities, and analyzed if their performance matched
predictions from the object file model versus the analog accumulator model.
In Experiment 1, the two sets were presented simultaneously, under water,
and they were visually (condition 1) or echoically (condition 2) available
at the time of choice. In experiment 2, the two sets were presented above
the water, successively (condition 1) or sequentially, item-by-item
(condition 2), so that they were not visually available at the time of
choice (condition 1) or at any time throughout the experiment (condition
2). We analyzed the effect of the ratio between quantities, the difference
between quantities, and the total number of items presented on the
subjects’ choices. All subjects selected the larger of the two sets of
quantities above chance levels in all conditions. However, unlike most
previous studies, the subjects’ choices did not match the predictions from
the accumulator model. Whether these findings reflect interspecies
differences in the mechanisms which underpin relative quantity judgments
remains to be determined.

Keywords: Numerical cognition; Relative quantity judgment; Beluga
whale; Bottlenose
dolphin; Object file model; Analog accumulator model

PhD. José Fco. Zamorano Abramson.
Departamento de Psicobiología.
Facultad de Psicología
Universidad Complutense de Madrid
Campus de Somosaguas 28223 Madrid, Spain
zabramson at psi.ucm.es
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