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Behav. Sci. 2013, 3(3), 501-521; doi:10.3390/bs3030501
Article

On the Evolution and Optimality of Mood States

1,* , 2
, 2
, 3
 and 1
Received: 5 June 2013; Accepted: 31 July 2013 / Published: 26 August 2013
(This article belongs to the Special Issue Functional Perspectives on Emotion, Behavior, and Cognition)
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Abstract: Moods can be regarded as fluctuating dispositions to make positive and negative evaluations. Developing an evolutionary approach to mood as an adaptive process, we consider the structure and function of such states in guiding behavioural decisions regarding the acquisition of resources and the avoidance of harm in different circumstances. We use a drift diffusion model of decision making to consider the information required by individuals to optimise decisions between two alternatives, such as whether to approach or withdraw from a stimulus that may be life enhancing or life threatening. We show that two dimensions of variation (expectation and preparedness) are sufficient for such optimal decisions to be made. These two dispositional dimensions enable individuals to maximize the overall benefits of behavioural decisions by modulating both the choice made (e.g., approach/withdraw) and decision speed. Such a structure is compatible with circumplex models of subjectively experienced mood and core affect, and provides testable hypotheses concerning the relationships that occur between valence and arousal components of mood in differing ecological niches. The paper is therefore a useful step toward being able to predict moods (and the effect of moods) using an optimality approach.
Keywords: emotion; circumplex; mood; drift diffusion model; optimal decision making; core affect emotion; circumplex; mood; drift diffusion model; optimal decision making; core affect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Trimmer, P.C.; Paul, E.S.; Mendl, M.T.; McNamara, J.M.; Houston, A.I. On the Evolution and Optimality of Mood States. Behav. Sci. 2013, 3, 501-521.

AMA Style

Trimmer PC, Paul ES, Mendl MT, McNamara JM, Houston AI. On the Evolution and Optimality of Mood States. Behavioral Sciences. 2013; 3(3):501-521.

Chicago/Turabian Style

Trimmer, Pete C.; Paul, Elizabeth S.; Mendl, Mike T.; McNamara, John M.; Houston, Alasdair I. 2013. "On the Evolution and Optimality of Mood States." Behav. Sci. 3, no. 3: 501-521.


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