4 research outputs found

    Experimental Task and Results

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    <div><p>(A) Schematic of the apparatus and task. On contact trials (top), in response to an auditory go signal, participants produced a brief force pulse with their right index finger on a force sensor fixed above their left index finger. A similar force pulse was delivered to the left index finger by a torque motor. On no-contact trials (bottom), the force sensor was moved at the start of the trial so that participants made a tapping movement with their right index finger but did not make contact.</p> <p>(B) Mean relative magnitude of the comparison tap to the test tap at the point of perceptual equality as a function of trial type and participant group. Error bars represent ±1 SE.</p></div

    Hypothesized and Measured Indifference Curves and Loss Function from a Single Subject

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    <div><p>(A–C) The predicted indifference lines are shown that minimize (A) the integrated force <i>(F × T),</i> (B) the integrated squared force <i>(F<sup>2</sup> × T),</i> and (C) the maximal force <i>(F)</i>.</p> <p>(D) Experimental data from a single subject. The open circles are the reference forces. The blue full circles connected by the black lines represent indifference points. Error bars denote the 95% confidence intervals. Force profiles are illustrated (blue curves for single forces, pink curve for doubling points).</p> <p>(E) Inferred color plot of the loss function (warmer colors represent greater cost).</p></div

    Iso-Loss Contours and Loss Function for the Set of All Subjects

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    <p>The black curves are the iso-loss curves. Error bars denote the standard error of the mean over the population. The color plot represents the inferred loss function (warmer colors represent greater loss) obtained by interpolating the data from the double-hump forces.</p

    The Experimental Setup

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    <p>The subject's hand position (pink circle) was visible on the screen. The hand movement was restricted to stay within a small area (blue box). The direction of the force is represented by the blue arrow, and the temporal profile of the force is shown by the blue curve.</p