Temporal dynamics of choice behavior in rats and humans: An examination of pre-and post-choice latencies

Justine Fam*, Fred Westbrook, Ehsan Arabzadeh

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Identifying similarities and differences in choice behavior across species is informative about how basic mechanisms give rise to more complex processes. In the present study, we compared pre-and post-choice latencies between rats and humans under two paradigms. In Experiment 1, we used a cued choice paradigm where subjects were presented with a cue that directed them as to which of two options to respond for rewards. In Experiment 2, subjects were free to choose between two options in order to procure rewards. In both Experiments rewards were delivered with distinct probabilities. The trial structure used in these experiments allowed the choice process to be decomposed into pre-and post-choice processes. Overall, post-choice latencies reflected the difference in reward probability between the two options, where latencies for the option with higher probability of reward were longer than those for the option with lower probability of reward. An interesting difference between rats and humans was observed: the choice behavior for humans, but not rats, was sensitive to the free-choice aspect of the tasks, such that in free-choice trials post-choice latencies no longer reflected the difference in reward probabilities between the two options.

    Original languageEnglish
    Article number20583
    JournalScientific Reports
    Volume6
    DOIs
    Publication statusPublished - 10 Feb 2016

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