Glissades-Eye Movements Generated by Mismatched Components of the Saccadic Motoneuronal Control Signal
نویسندگان
چکیده
Human saccadic eye movements have three types of overshoot: dynamic overshoot, lasting 10-30 ms; glissadic overshoot, lasting 30-500 ms; and static overshoot, which is amended-after a delay of about 200 ms-by a subsequent corrective saccade. Glissades are the slow drifting eye movements occasionally seen at the end of saccadic eye movements. Glissades are hypothecated to be produced by mismatches in the pulse and step components of the motoneuronal controller signals. Glissades are not vergence eye movements, although the dynamics are similar.
منابع مشابه
Glissadic overshoots are due to pulse width errors.
Glissades are the slow, gliding eye movements often appended to the end of human saccadic eye movements. They have been used as an aid in diagnosing disease states, eg, multiple sclerosis and vascular lesions. Glissades are a consequence of a mismatch between the sizes of the pulse and step components of the pulse-step motoneuronal controller signals. This physiological and simulation study sho...
متن کاملOverlapping saccades and glissades are produced by fatigue in the saccadic eye movement system.
Saccadic eye movements and their neurological control signals change significantly as the human fatigues. Electronic instrumentation with a bandwidth extending from DC to 1 kHz enabled the recording of anomalous looking saccadic eye movements that occurred as the subject's physiological state changed. Fatigue can produce: overlapping saccades in which the high-frequency saccadic bursts should s...
متن کاملRole of the lateral intraparietal area in modulation of the strength of sensory-motor transmission for visually guided movements.
The lateral intraparietal area (LIP) has been implicated as a salience map for control of saccadic eye movements and visual attention. Here, we report evidence to link the encoding of saccades and saliency in LIP to modulation of several other sensory-motor behaviors in monkeys. In many LIP neurons, there was a significant trial-by-trial correlation between the firing rate just before a saccade...
متن کاملDevelopment, validation, and sensitivity analyses of human eye movement models.
A, Why the Ocular Motor Systems? The ocular motor systems are ideal for studying the control of human movement. Eye movements are easy to measure, and the control of saccadic eye movements is simpler than the control of other neuromuscular systems. It is simpler because the load presented by the eyeball and extraocular tissues is small and constant. Horizontal eye movements offer a further simp...
متن کاملSpatial attention and latencies of saccadic eye movements
Recent theories of visual attention, such as the oculomotor readiness theory of Klein (1980) (Does oculomotor readiness mediate cognitive control of the visual attention. In: R. Nickerson, Attention and performance, Hillsdale: Erlbaum), the premotor theory of Rizzolati (1983) (Mechanisms of selective attention in mammals. In: J.P. Ewart, R.R. Capranica, D.J. Ingle, Advances in vertebrate Neuroe...
متن کامل