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Updated: Sep 16, 2025

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Quantifying the Sense Agency: A Forced Choice Paradigm for Assessing Intentional Binding During Upper Limb Movements.

Momchil Gavrilov, Katherine A Jordan, Weiwei Zhou

    IEEE ... International Conference on Rehabilitation Robotics : [Proceedings]
    |July 11, 2025
    PubMed
    Summary

    This study developed a new method to measure the sense of agency, specifically intentional binding (IB), during whole-limb movements. This high-resolution approach has implications for designing better assistive and rehabilitative robotic devices.

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    Area of Science:

    • Neuroscience
    • Human-Computer Interaction
    • Robotics

    Background:

    • Sense of agency is the feeling of controlling one's actions.
    • Intentional binding (IB) quantifies agency by measuring perceived time compression between action and outcome.
    • Existing IB research primarily uses simple actions, limiting applicability to complex movements.

    Purpose of the Study:

    • To develop and validate a high-resolution method for assessing intentional binding (IB) during gross whole-limb movements.
    • To adapt IB measurement for contexts relevant to assistive and rehabilitative robotics.
    • To explore a novel forced two-choice discrimination paradigm for IB assessment.

    Main Methods:

    • A target acquisition task involving whole upper limb movements was designed.
    • Participants used a Kinarm robotic system to perform active and passive movements.
    • A forced two-choice discrimination paradigm assessed perceived time intervals between auditory tones and movements, with varying time delays.

    Main Results:

    • A novel, high-resolution method for measuring IB in whole-limb movements was successfully developed and validated.
    • Psychometric curves provided precise estimates of IB biases, with a median bias of -36.2ms.
    • A new analytical dimension, the slope of IB experiences, was introduced.

    Conclusions:

    • The developed method offers a high-resolution assessment of intentional binding during complex limb movements.
    • Findings have significant implications for the design and evaluation of assistive and rehabilitative robotic devices.
    • This approach enhances the understanding of agency perception in more ecologically valid movement scenarios.