An interventional study of psychophysics in Behavior, sponsored by University of Colorado, Boulder. Recruiting at 1 site in United States. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-05-18.
Sponsored by University of Colorado, Boulder · Not applicable, Interventional, and Basic science
The investigators will record behavioral responses from human participants on crowdsourcing platform Prolific to identify the decision strategies humans apply short-term, long-term, and multi timescale (across both timescales) inference tasks. Participants will perform a flexible decision-making task (described in Research Strategy Aim 1) in which subjects must determine which of two locations a series of evidence (package drops) came from. Subjects must 1) report the current location, 2) predict the next location. The investigators will record these responses, the number (and sequence) of evidence, and the response time (time from the end of trial until the response) for each trial. Subjects will perform all blocks (parameters and number of blocks to be determined by inference model development and testing prior to task development) so that we can compare responses at each timescale. Since participants participate voluntarily for small sums of money (around $12/ hour based on duration of task) and the investigators' previous studies have collected over 200 subjects in a matter of days, they will aim to record behavioral data from 1000 subjects. This number allows them to address the broad range of subject variability expected using Bayesian statistical methods such as Bayes factors.
371 studies on the registry are indexed under Behavior; 158 are open to participants now.
This study's planned enrollment of 500 is above the median of 120 across 295 interventional studies indexed under Behavior.
Browse Behavior studies →University of Colorado, Boulder is the lead sponsor of 86 studies on the registry; 20 are open to participants now.
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Exclusion Criteria:
Behavioral: psychophysics
Subjects will be shown two locations and a series of package drops that switch between the two locations with an unknown frequency. Subjects must identify which location is current in use and which location will be selected next. Subjects know that the frequency of the location changes is different in each block but not its exact value
Binary Behavioral Decision Responses
Subject- provided choices (responses on the computer) between two presented options
Time frame: Through task completion on each task trial, approximately 1-5x/ minute for approximate 30 minutes
Plan to share: Yes — The task structure will be preregistered to Open Science Framework (OSF) prior to data acquisition. De-identified data will be posted to OSF following publication.
Supporting information: Study protocol, Analytic code
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University of Colorado, Boulder