System for projection of a three-dimensional, moving virtual target for studies of eye-hand coordination

W. Schneider, T. J. Harris, I. E. Feldberg, J. T. Massey, A. P. Georgopoulos, R. A. Meyer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Eye-hand tracking of moving visual objects in three-dimensional (3D) space is common in the behavioral repertoire of primates. However, behavioral and/or neurophysiological studies of this function are lacking mainly because devices do not exist that allow its investigation. We describe a device by which a spot of light can be presented in the immediate extrapersonal space of a subject and can be moved in various trajectories in 3D space. The target is a real image of a circular aperture produced by a system consisting of a light source, aperture, filters, several lenses and fold mirros, and a large concave mirror to focus the final real image. Rapid, computer-controlled movement of the image is obtained by tilting a gimbal-mounted guide mirror (for x and y motion) and by translating a lens (for motion in the z direction). A second configuration of the system allows movement of a 3D image in the 3D space. Hand motion is monitored by means of a sonic, 3D, position-measurement system.

Original languageEnglish (US)
Pages (from-to)135-140
Number of pages6
JournalJournal of Neuroscience Methods
Issue number1-2
StatePublished - Nov 1995

Bibliographical note

Funding Information:
We greatly appreciate the assistance of A. Szpak, C. Stuller, and L.J. Adams. This research was sponsored by the National Institutes of Health under Grant NS-07226 and NS-17413.


  • Motor cortex
  • Movement
  • Psychophysics


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