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Effective sampling time for saccadic eye movement from experiments using a vergence input

B L Zuber, L Djordjevich

American Journal of Optometry and Physiological Optics

|September 1, 1980

Summary

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The saccadic system has a 0.2-degree dead zone and a sampling time. Saccade latency depends on target velocity, with distinct time segments influencing response.

Area of Science:

Neuroscience
Ophthalmology
Systems Biology

Background:

The saccadic system, crucial for rapid eye movements, is complex.
Understanding its response dynamics to visual stimuli is vital.

Purpose of the Study:

To analyze the amplitude and latency of the saccadic component of the compound response.
To investigate the saccadic system's operational characteristics, including dead zone and sampling time.

Main Methods:

Analysis of saccadic component amplitude and latency.
Quantification of the saccadic system's dead zone size.
Decomposition of saccade latency into distinct time segments based on target velocity.

Main Results:

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The saccadic system exhibits a dead zone of 0.2 degrees.

Saccade latency comprises three segments: dead zone crossing, sampling, and post-sampling.

The time to cross the dead zone is inversely proportional to target velocity.

The sampling segment has a constant duration of 191 msec.

The post-sampling segment duration varies with target velocity, being constant (~70 msec) at zero velocity.

Conclusions:

The saccadic system operates with a defined dead zone and effective sampling time.
Target velocity significantly influences saccade latency dynamics.
These findings provide insights into the temporal processing of the saccadic system.