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Experimental Brain Research

, Volume 233, Issue 12, pp 3597–3611 | Cite as

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

  • Cinzia Calluso
  • Giorgia Committeri
  • Giovanni Pezzulo
  • Nathan Lepora
  • Annalisa Tosoni
Research Article

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 choice uncertainty.

Keywords

Choice behavior Decision making Mathematical models 

Notes

Acknowledgments

We wish to thank Giulia Piraino for her help during data collection.

Funding

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.

Author contribution

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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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Cinzia Calluso
    • 1
    • 2
  • Giorgia Committeri
    • 1
    • 2
  • Giovanni Pezzulo
    • 3
  • Nathan Lepora
    • 4
    • 5
  • Annalisa Tosoni
    • 1
    • 2
  1. 1.Department of Neuroscience, Imaging and Clinical SciencesG. D’Annunzio UniversityChieti ScaloItaly
  2. 2.Institute for Advanced Biomedical TechnologiesG. D’Annunzio UniversityChieti ScaloItaly
  3. 3.Institute of Cognitive Sciences and Technologies National Research CouncilRomeItaly
  4. 4.Department of Engineering MathematicsUniversity of BristolBristolUK
  5. 5.Bristol Robotics Laboratory (BRL)University of Bristol and University of the West of EnglandBristolUK

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