System for projection of a three-dimensional, moving virtual target for studies of eye-hand coordination.
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.
Schneider
W
W
Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA.
Harris
T J
TJ
Feldberg
I E
IE
Massey
J T
JT
Georgopoulos
A P
AP
Meyer
R A
RA
D006801:Humans; D009044:Motor Cortex / Q000502:physiology; D009068:Movement / Q000502:physiology; D055095:Optics and Photonics / Q000295:instrumentation*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D012984:Software