Analysis of hand kinematics reveals inter-individual differences in intertemporal decision dynamics

Experimental Brain Research
Cinzia CallusoAnnalisa Tosoni

Abstract

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 ...Continue Reading

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Citations

Nov 14, 2017·Cognitive Science·Takashi Yamauchi, Kunchen Xiao
Jan 27, 2019·Behavior Research Methods·Martin SchoemannStefan Scherbaum
Feb 11, 2020·Frontiers in Psychology·Nadège Bault, Elena Rusconi
Jun 27, 2018·Frontiers in Psychology·Cinzia CallusoDaria Knoch
Oct 5, 2021·Cognitive Science·Anton Leontyev, Takashi Yamauchi

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