Analysis of hand kinematics reveals inter-individual differences in intertemporal decision dynamics
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During intertemporal decisions, the preference for smaller, sooner reward over larger-delayed rewards (temporal discounting, TD) exhibits substantial inter-subject variability; however, it is currently unclear what are the mechanisms underlying this apparently idiosyncratic behavior. To answer this question, here we recorded and analyzed mouse movement kinematics during intertemporal choices in a large sample of participants (N = 86). Results revealed a specific pattern of decision dynamics associated with the selection of “immediate” versus “delayed” response alternatives, which well discriminated between a “discounter” versus a “farsighted” behavior—thus representing a reliable behavioral marker of TD preferences. By fitting the Drift Diffusion Model to the data, we showed that differences between discounter and farsighted subjects could be explained in terms of different model parameterizations, corresponding to the use of different choice mechanisms in the two groups. While farsighted subjects were biased toward the “delayed” option, discounter subjects were not correspondingly biased toward the “immediate” option. Rather, as shown by the dynamics of evidence accumulation over time, their behavior was characterized by high choice uncertainty.
KeywordsChoice behavior Decision making Mathematical models
We wish to thank Giulia Piraino for her help during data collection.
Research funded by the EU’s FP7 under Grant Agreement No FP7-ICT-270108 and the HFSP under Grant Agreement RGY0088/2014 to GP, and University G. d’Annunzio research funds to GC.
C. C., A. T., G. P and G. C. designed research; C. C. performed research; C. C., A. T., and N. L. analyzed data; and C. C., A. T., G. P., N. L. and G. C. wrote the paper.
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