Abstract
A system has been developed for measuring the three-dimensional (3D) isometric forces produced by the arm in response to a visual stimulus. The output of 3 load cells is combined to determine the components of the 3D response force. The maximum force range of the load cells is 2000 g which can be read with a resolution of 4 g and with a measured accuracy of + / - 10 g. An overload stop protects the device to a load of 23 kg. The visual instruction to the subject concerning the direction and magnitude of the 3D force vector to be produced is presented using a vivid spherical stereogram. This stereogram is produced using the anaglyphic technique where the left and right images are separated by color filters. A dense aggregation of points defines the target cursor, which can be positioned anywhere inside or on the surface of the sphere. This cursor can represent a stationary or a moving target. A force feedback cursor can be provided to indicate to the subject his/her response. The color display on the cathode ray tube is produced by a display generator driven by a computer.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 123-127 |
| Number of pages | 5 |
| Journal | Journal of Neuroscience Methods |
| Volume | 26 |
| Issue number | 2 |
| DOIs | |
| State | Published - Dec 1988 |
| Externally published | Yes |
Bibliographical note
Funding Information:This work was supportedb y USPHS Grants NS07226 and NS17413 which we gratefullya c-knowledgeD. r. J.T. Massey is also a membero f the Departmenotf BiomedicalE ngineeringT, he Johns Hopkins UniversityS choolof Medicine.
Keywords
- Isometric
- Three-dimensional force
- Three-dimensional visual stimulus
- Upper limb