Aposematic colouration enhances memory formation in domestic chicks trained in a weak passive avoidance learning paradigm

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Title Aposematic colouration enhances memory formation in domestic chicks trained in a weak passive avoidance learning paradigm
Author Johnston, Amy Nicole Burne; Burne, Thomas H.J.
Journal Name Brain Research Bulletin
Year Published 2008
Place of publication United States
Publisher Elsevier Inc
Abstract The one-trial passive avoidance learning task is commonly used in avian research to explore anatomical, cellular and molecular parameters of learning and memory. Many factors are known to influence the effectiveness and/or duration of such learning events. Combinations of novel odours, such as pyrazine, and aposematic colours, such as brig ht yellow or red, have been shown to induce a long-lasting aversion to food crumbs in 'visual' predators, including birds such as the domestic chick (1). The aim of this study was to (a) examine whether visual complexity played a role in the generation of an aversive response to a novel visual stimulus and (b) to establish whether the duration of memory of an aversive experience could be modified by altering the visual properties of the stimulus. In the first experiment, na¨ıve domestic chicks were trained on a weakly aversive one-trial passive avoidance bead task, in which chicks were allowed to peck at a bead coated with a 10% solution of the bitter-tasting and odorous substance methylanthranilate (MeA). The chicks were trained with (allowed to peck) one of four differently coloured beads dipped in 10% MeA. Chrome, black, yellowor black-and-yellowstriped beadswere used. 'Recall' of the aversive bead was examined by presenting the (clean) training bead 24 h after training and monitoring avoidance to it compared to a 'neutral' white bead. A high proportion (63%) of chicks trained with the black and yellow striped bead avoided it 24 h after training, whereas little or no avoidance was seen in response to chrome, yellow or black beads. In a second experiment na¨ıve domestic chicks were all trained once only with a black and yellow striped bead coated in a 10% MeA solution, but this time, were tested 24 h later, once only, with either a black, a yellow or a black and yellow striped bead. Nearly 60% of chicks tested with a black and yellow striped bead showed avoidance of the bead, whereas only 23% of those tested with a black bead and 14% tested with a yellow bead showed avoidance. These results confirm the importance of complex warning colouration, when paired with a novel olfactory cue and a bitter taste, in avoidance learning. We conclude that the chicks' response to monochromatic colours (e.g. yellow or black) is not affected by their previous experience with a conspicuously patterned stimulus (yellow and black stripes). Moreover, it suggests a predisposition for chicks to attend to aversive cues associated with 'naturalistic' high contrast colour cue combinations such as black and yellow.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.elsevier.com/wps/find/journaldescription.cws_home/525456/description#description
Alternative URI http://dx.doi.org/10.1016/j.brainresbull.2008.02.016
Copyright Statement Copyright 2008 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 76
Edition 2008
Page from 313
Page to 316
ISSN 0361-9230
Date Accessioned 2008-06-02
Language en_AU
Research Centre Centre for Health Practice Innovation; Eskitis Institute for Drug Discovery
Faculty Faculty of Science, Environment, Engineering and Technology
URI http://hdl.handle.net/10072/20172
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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