Featured lab - Kording - Rehabilitation Institute of Chicago

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Featured lab - Kording


Featured lab - Kording

Economics of Movement group

Recent studies in motor control have shown that visuomotor rotations for reaching have narrow generalization functions: what we learn during movements in one direction only affects subsequent movements into close directions. Here we wanted to measure the generalization functions for wrist movement. To do so we had 7 subjects performing an experiment holding a mobile phone in their dominant hand. The mobile phone’s built in acceleration sensor provided a convenient way to measure wrist movements and to run the behavioral protocol. Subjects moved a cursor on the screen by tilting the phone. Movements on the screen toward the training target were rotated and we then measured how learning of the rotation in the training direction affected subsequent movements in other directions. We find that generalization is local and similar to generalization patterns of visuomotor rotation for reaching.

Konrad Kording, Ph.D.

Learning and Movement Baseline

Learning and Movement Baseline

A) The four blokes of the experiments and corresponding number of trials. Lines are cursor position and hand orientation from an individual subject. B) Blue and red lines are average directional errors of cursor (+/- SD) across subjects during baseline and learning blocks. Black line is the fit of the experimental learning curve, C) Anisotropy of baseline movements. Average directional bias (+/- SEM) across subjects using a 45o bins. Dots are individual trials.


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