Quantity Discrimination in Domestic Rats, Rattus norvegicus
Animal Behavior and Welfare Research Group, Department of Animal and Land Sciences, Hartpury University Centre, Hartpury, Gloucestershire GL19 3BE, UK
Author to whom correspondence should be addressed.
Academic Editor: Clive J. C. Phillips
Received: 30 April 2016 / Revised: 26 July 2016 / Accepted: 1 August 2016 / Published: 3 August 2016
Quantity discrimination is a basic form of numerical competence where an animal distinguishes which of two amounts is greater in size. Whilst quantity discrimination in rats has been investigated via training paradigms, rats’ natural quantity discrimination abilities without explicit training for a desired response have not been explored. This study investigated domestic rats’ ability to perform quantity discrimination. Domestic rats ( n
= 12) were examined for their ability to distinguish the larger amount under nine quantity comparisons. One-sample t
-tests identified a significant preference for the larger quantity in comparisons of 1 vs. 2, 2 vs. 3, 3 vs. 5, 3 vs. 8, 4 vs. 6, and 4 vs. 8. No preference between quantities was found for comparisons of 3 vs. 4, 4 vs. 5 and 5 vs. 6. Overall, this study drew two key conclusions. Firstly, that domestic rats are capable of performing quantity discrimination without extensive training. Secondly, as subjects adhered to Weber’s law, it was concluded that the approximate number system underpins domestic rats’ ability to perform spontaneous quantity discrimination.
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MDPI and ACS Style
Cox, L.; Montrose, V.T. Quantity Discrimination in Domestic Rats, Rattus norvegicus. Animals 2016, 6, 46.
Cox L, Montrose VT. Quantity Discrimination in Domestic Rats, Rattus norvegicus. Animals. 2016; 6(8):46.
Cox, Laura; Montrose, V. T. 2016. "Quantity Discrimination in Domestic Rats, Rattus norvegicus." Animals 6, no. 8: 46.
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