Article

We evaluated the ability of an individual with a high cervical spinal cord injury
(SCI) to control a cursor on a computer screen using two different user
interfaces: (1) head movements measured via a head-mounted orientation sensor and
(2) electromyography (EMG) signals from four head and neck muscles acquired using
a 4-channel implanted upper-limb neuroprosthesis that had been deployed in an
earlier study. The subject moved the cursor to a set of targets on the screen in
a two-dimensional, center-out, target-acquisition task, and his performance was
evaluated with a variety of performance measures to assess both position and
velocity control accuracy. The subject's performance with both command sources
was also compared with the performance of a group of nondisabled subjects. Head
orientation provided more accurate performance but was less responsive than EMG.
Both command sources showed some directionally dependent performance, with
movement to diagonally located targets being performed by a series of sequential
motions rather than via straight paths. Overall, the SCI subject's performance
with each command source was similar to that reported for a nondisabled
population using the same interfaces and performing the same task.

Langue : ANGLAIS