Showing papers on "Eye tracking published in 1973"

Accurate two-dimensional eye tracker using first and fourth Purkinje images

Abstract: Although a number of devices are currently in use for monitoring eye position, none is both accurate and convenient to use. Methods based on the use of contact lenses can provide high accuracy but have obvious inconveniences. Other techniques—e.g., skin-mounted electrodes, or eyeglass-mounted photoelectric pickups—are relatively convenient, but eye position can be measured to an accuracy of no better than about 0.5° to 1°. A novel eye-tracking instrument has been developed that makes use of two Purkinje images. The instrument operates in the infrared, so that it does not interfere with normal vision; it requires no attachments to the eye; it has a sensitivity and accuracy of about 1 min of arc, and operates over a two-dimensional visual field of 10° to 20° in diameter. The basic principle of the instrument is described, and operating records are shown.

The neurotological significance of alterations of pursuit eye movements and the pendular eye tracking test.

Abstract: Smooth pursuit eye movements can be studied if the patient follows a target that moves horizontally in a pendular way. The eye movements can be recorded with electro-oculographic technique, and the...

Receptive fields in single cells of monkey visual cortex during visual tracking.

Abstract: Monkeys were trained to visually track a moving target. During tracking, receptive fields in the primary visual cortex were explored with a stimulus fixed to a screen so that its image swept across the retina but not across the visual world. The same cells were also explored with stimuli which presented both “absolute” motion (across the retina) and “relative” motion (across the background); 39 % of the cells responded only to relative motion, and another 39 % responded to both absolute and relative motion. This response pattern can differentiate translation of the retinal image during eye movement from motion of objects in the world. A similar result was obtained with another method. The monkey has no receptive fields which respond to stimuli in a given region of the visual world regardless of eye position.