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Full-Text Articles in Biomedical Engineering and Bioengineering
Sensitivity To Hand Path Curvature During Reaching, Kyle P. Lillis, Robert A. Scheidt
Sensitivity To Hand Path Curvature During Reaching, Kyle P. Lillis, Robert A. Scheidt
Robert Scheidt
People optimize reaching to make straight and smooth movements. We performed experiments characterizing human sensitivity to hand path deviations from a straight reach. Vision of the arm was blocked. Subjects either moved the hand along paths of constrained curvature, or a robot moved the relaxed limb along similar trajectories (active and passive conditions, respectively). Subjects responded after each trial whether or not they thought the movement curved convex right. In a series of three experiments, we tested the effects of modifying visual feedback of hand position to suppress curvature, isotonic muscle activation, and a distracter task on subjects ability to …
Visual, Motor And Attentional Influences On Proprioceptive Contributions To Perception Of Hand Path Rectilinearity During Reaching, Robert A. Scheidt, Kyle P. Lillis, Scott J. Emerson
Visual, Motor And Attentional Influences On Proprioceptive Contributions To Perception Of Hand Path Rectilinearity During Reaching, Robert A. Scheidt, Kyle P. Lillis, Scott J. Emerson
Robert Scheidt
We examined how proprioceptive contributions to perception of hand path straightness are influenced by visual, motor and attentional sources of performance variability during horizontal planar reaching. Subjects held the handle of a robot that constrained goal-directed movements of the hand to the paths of controlled curvature. Subjects attempted to detect the presence of hand path curvature during both active (subject driven) and passive (robot driven) movements that either required active muscle force production or not. Subjects were less able to discriminate curved from straight paths when actively reaching for a target versus when the robot moved their hand through the …