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

J Neurosci Methods. 1995 Nov;62(1-2):135-40. doi: 10.1016/0165-0270(95)00068-2.


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 mirrors, 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.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Humans
  • Motor Cortex / physiology
  • Movement / physiology
  • Optics and Photonics / instrumentation*
  • Photic Stimulation
  • Psychomotor Performance / physiology*
  • Software*