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Effects Of Optimal Tactile Feedback In Balancing Tasks: A Pilot Study, Emmanouil Tzorakoleftherakis, Ferdinando Mussa-Ivaldi, Robert Scheidt, Todd Murphey
Effects Of Optimal Tactile Feedback In Balancing Tasks: A Pilot Study, Emmanouil Tzorakoleftherakis, Ferdinando Mussa-Ivaldi, Robert Scheidt, Todd Murphey
Robert Scheidt
In this study, we employ optimal control and tactile feedback to teach subjects how to balance a simulated inverted pendulum. The output of a Linear Quadratic Regulator (LQR) was converted to a vibratory teacher-signal and was provided as additional somatosensory feedback to the subjects. The LQR approach is consistent with an energy-saving strategy commonly observed during human motor learning. Our rationale for using the inverted pendulum as a criterion task is that this balance system requires the brain to solve many of the same problems encountered in simple tasks of daily living like transporting a glass of water to the …
Visuo-Proprioceptive Interactions During Adaptation Of The Human Reach, Timothy Judkins, Robert Scheidt
Visuo-Proprioceptive Interactions During Adaptation Of The Human Reach, Timothy Judkins, Robert Scheidt
Robert Scheidt
We examined whether visual and proprioceptive estimates of transient (mid-reach) target capture errors contribute to motor adaptation according to the probabilistic rules of information integration used for perception. Healthy adult humans grasped and moved a robotic handle between targets in the horizontal plane while the robot generated spring-like loads that varied unpredictably from trial-to-trial. For some trials, a visual cursor faithfully tracked hand motion. In others, the handle's position was locked and subjects viewed motion of a point-mass cursor driven by hand forces. In yet other trials, cursor feedback was dissociated from hand motion or altogether eliminated. We used time- …