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    Human force reproduction shows systematic errors that depend on force level. Reafference feedback alone does not explain these force reproduction errors, suggesting other factors are involved.

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    Area of Science:

    • Motor control
    • Human sensorimotor system
    • Biomechanics

    Background:

    • Humans exhibit systematic errors when reproducing previously perceived forces or positions.
    • Previous research suggested reafference feedback (sensory predictions from self-generated forces) as the primary cause of force reproduction error.

    Purpose of the Study:

    • To investigate the influence of force level on both force and position reproduction accuracy.
    • To determine if reafference feedback is the sole contributor to force reproduction errors when both target and reproduction forces are self-generated.

    Main Methods:

    • Participants performed force reproduction tasks against a fixed handle at various force levels.
    • Participants executed position reproduction tasks against a haptic manipulator with constant opposing forces.
    • A reference trial (matching visual target) was followed by a reproduction trial (without visual feedback).

    Main Results:

    • Force reproduction errors were dependent on force level: forces were overestimated at low levels (<40 N) and underestimated at high levels (>130 N).
    • No significant effect of force level was observed on position reproduction error.
    • The observed force reproduction errors indicate that reafference feedback is not the exclusive cause.

    Conclusions:

    • Force reproduction accuracy is modulated by the force level, with distinct error patterns at low and high forces.
    • The findings challenge the notion that reafference feedback is the sole mechanism behind force reproduction errors.
    • Additional factors beyond reafference feedback likely contribute to systematic errors in human force reproduction.