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Context-dependent decisions among options varying in a single dimension.

Lookup NU author(s): Professor Melissa Bateson, Dr Lucy Asher, Dr Susan Healy

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Abstract

Contrary to theories of rational choice, adding alternatives to a choice set can change the choices made by both humans and animals. This is usually done by adding an inferior decoy to a choice set of two favoured options that are characterized on two distinct dimensions. We presented wild, free-living rufous hummingbirds (Selasphorus rufus) with choices between two or three options that varied in a single dimension only. The options varied in concentration, in volume or in corolla length. When the options varied in concentration, the addition of a medium option to a choice set of a low and a high concentration caused birds to increase their preference for the high option. However, they decreased their preference for the high concentration option when a low option was added to a choice set of high and medium concentrations. When the options varied only in volume, the addition of a high volume option to a choice set of low and medium options decreased the birds' preference for the medium option. We saw no effects of adding a third option when the options varied in corolla length alone. Hummingbirds, then, make context-dependent decisions even when the options vary in only a single dimension although which effect occurs seems to depend on the dimension being manipulated. None of the current theories alone adequately explain these results. (C) 2011 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Morgan KV, Hurly TA, Bateson M, Asher L, Healy SD

Publication type: Article

Publication status: Published

Journal: Behavioural Processes

Year: 2012

Volume: 89

Issue: 2

Pages: 115-120

Print publication date: 01/02/2012

ISSN (print): 0376-6357

ISSN (electronic): 1872-8308

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.beproc.2011.08.017

DOI: 10.1016/j.beproc.2011.08.017


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