Can the cognitive characteristics of signal receivers exert selective pressure on signal senders?
Lynn, Spencer*,1,2, Cnaani, Jonathan1,3, Papaj, Daniel1,4, 1 University of Arizona, Tucson, AZ2 skl@u.arizona.edu3 jcnaani@ag.arizona.edu4 papaj@u.arizona.edu ABSTRACT- The sensory discrimination phenomenon of peak-shift was examined in bumblebees within the framework of signal detection theory. The theory explains peak-shift by its emphasis on ecological and cognitive factors such as value of information, uncertainty of signal, and decision payoff. Manipulations of signal parameters (e.g., frequency and distribution, decision payoff) can produce predictable changes in stimulus choice. The applicability of signal detection theory to phenomena in generalization and discrimination learning, such as peak shift, threshold response, and categorization has interesting implications regarding a role for cognitive mechanisms in the evolution of signaling systems such as sexual selection and pollination. Changes to the signal parameters of unpreferred stimuli may induce receivers to change their
