NDLI: The psychophysics of sugar concentration discrimination and contrast evaluation in bumblebees

Content Provider	Springer Nature Link
Author	Nachev, Vladislav Thomson, James D. Winter, York
Copyright Year	2012
Abstract	The capacity to discriminate between choice options is crucial for a decision-maker to avoid unprofitable options. The physical properties of rewards are presumed to be represented on context-dependent, nonlinear cognitive scales that may systematically influence reward expectation and thus choice behavior. In this study, we investigated the discrimination performance of free-flying bumblebee workers (Bombus impatiens) in a choice between sucrose solutions with different concentrations. We conducted two-alternative free choice experiments on two B. impatiens colonies containing some electronically tagged bumblebees foraging at an array of computer-automated artificial flowers that recorded individual choices. We mimicked natural foraging conditions by allowing uncertainty in the probability of reward delivery while maintaining certainty in reward concentration. We used a Bayesian approach to fit psychometric functions, relating the strength of preference for the higher concentration option to the relative intensity of the presented stimuli. Psychometric analysis was performed on visitation data from individually marked bumblebees and pooled data from unmarked individuals. Bumblebees preferred the more concentrated sugar solutions at high stimulus intensities and showed no preference at low stimulus intensities. The obtained psychometric function is consistent with reward evaluation based on perceived concentration contrast between choices. We found no evidence that bumblebees reduce reward expectations upon experiencing non-rewarded visits. We compare psychometric function parameters between the bumblebee B. impatiens and the flower bat Glossophaga commissarisi and discuss the relevance of psychophysics for pollinator-exerted selection pressures on plants.
Starting Page	417
Ending Page	427
Page Count	11
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	16
Issue Number	3
e-ISSN	14359456
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-22
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Bombus Nectarivory Foraging Psychometric function Decision-making Behavioural Sciences Zoology Human Physiology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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