Limits of Precision for Human Eye Motor Control

Abstract

If the two segments of a vernier targe are presented to different eyes, i.e., dichoptically, thresholds are three to four times higher than with presentation to the same eye. This increase in thresholds is mainly due to uncorrelated movements of both eyes, such as tremor and drifts, that occur even under steady fixation. The psychophysically measured thresholds allow one to calculate an upper estimate for the amplitudes of uncorrelated eye movements during fixation. This estimate matches the best results from direct eye position recording, with the calculated mean amplitude of eye tremor corresponding to roughly one photo-receptor-diameter. The combined amplitude of both correlated and uncorrelated eye movements was also measured by delaying one segment of the vernier relative to its partner under monocular or dichoptic conditions. Fixation proved to be relatively stable, and trained observers could sustain eye position within a few arcmin. Keywords: Hyperactivity.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1989
Accession Number
ADA225515

Entities

People

  • Manfred Fahle

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • C4I

DTIC Thesaurus Topics

  • Artificial Intelligence
  • Central Nervous System
  • Computer Programs
  • Computers
  • Data Displays
  • Detection
  • Eye Movements
  • Frequency
  • Human Factors Engineering
  • Information Processing
  • Information Science
  • Military Research
  • Nervous System
  • Orientation (Direction)
  • Psychology
  • Standards
  • Visual Perception

Fields of Study

  • Biology

Readers

  • Approximation Theory.
  • Human-Computer Interaction (HCI).
  • Toxicology/Environmental Toxicology