Understanding of the Concept of Numerically "Less" by Bottlenose Dolphins (Tursiops truncatus). Jaakkola, K., Fellner, W., Erb, L., Rodriguez, M., & Guarino, E. J Comp Psychol, 119(3):296-303, 2005. doi abstract bibtex In 2 experiments, bottlenose dolphins (Tursiops truncatus) judged the ordinal relationship between novel numerosities. The dolphins were first trained to choose the exemplar with the fewer number of items when presented with just a few specific comparisons (e.g., 2 vs. 6, 1 vs. 3, and 3 vs. 7). Generalization of this rule was then tested by presenting the dolphins with all possible pairwise comparisons between 1 and 8. The dolphins chose the exemplar with the fewer number of items at levels far above chance, showing that they could recognize and represent numerosities on an ordinal scale. Their pattern of errors was consistent with the idea of an underlying analog magnitude representation. ((c) 2005 APA, all rights reserved).
@Article{Jaakkola2005,
author = {Kelly Jaakkola and Wendi Fellner and Linda Erb and Mandy Rodriguez and Emily Guarino},
journal = {J Comp Psychol},
title = {Understanding of the {C}oncept of {N}umerically "{L}ess" by {B}ottlenose {D}olphins ({T}ursiops truncatus).},
year = {2005},
number = {3},
pages = {296-303},
volume = {119},
abstract = {In 2 experiments, bottlenose dolphins (Tursiops truncatus) judged
the ordinal relationship between novel numerosities. The dolphins
were first trained to choose the exemplar with the fewer number of
items when presented with just a few specific comparisons (e.g.,
2 vs. 6, 1 vs. 3, and 3 vs. 7). Generalization of this rule was then
tested by presenting the dolphins with all possible pairwise comparisons
between 1 and 8. The dolphins chose the exemplar with the fewer number
of items at levels far above chance, showing that they could recognize
and represent numerosities on an ordinal scale. Their pattern of
errors was consistent with the idea of an underlying analog magnitude
representation. ((c) 2005 APA, all rights reserved).},
doi = {10.1037/0735-7036.119.3.296},
keywords = {16131258},
}
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