Neuro-control in divergence eye movements

A. Daftari, T. L. Alvarez, M. L. Kung, J. L. Semmlow

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Vergence eye movements are essential to daily life. When driving down a highway a person typically looks between the speedometer and the road signs. This form of eye movement initiates a vergence response. Vergence is composed of convergence (inward) and divergence (outward) eye movements. Convergence movements are a combination of dual controllers, described as feedforward and feedback components. The feedforward component is a pulse of energy released by burst cells in the initial stage of the eye movement. Feedback is a series of steady periodic pulses released by tonic cells to fixate the eyes onto the target. However, divergence eye movements have not been studied extensively in the past This study will examine the neuro-control strategy used to mediate divergence eye movements (looking from near to far), when given different initial positions for the eyes to begin moving from. Preliminary data using independent component analysis (ICA) shows the divergence system contains an initial pulse, similar to the burst cells found to initiate convergence movements, when the movement began with a large initial bias (target very close to the subject). In responses beginning at a target located further away from the subject and continuing to move farther away, there is no noticeable pulse based on ICA. Demonstrated in this study is the dynamics of divergence movements at different initial conditions.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE 29th Annual Northeast Bioengineering Conference
EditorsStanley Reisman, Richard Foulds, Bruno Mantilla
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)0780377672
StatePublished - Jan 1 2003
Event29th IEEE Annual Northeast Bioengineering Conference, NEBC 2003 - Newark, United States
Duration: Mar 22 2003Mar 23 2003

Publication series

NameProceedings of the IEEE Annual Northeast Bioengineering Conference, NEBEC
ISSN (Print)1071-121X
ISSN (Electronic)2160-7001


Other29th IEEE Annual Northeast Bioengineering Conference, NEBC 2003
CountryUnited States

All Science Journal Classification (ASJC) codes

  • Bioengineering


  • Biomedical engineering
  • Control systems
  • Convergence
  • Eyes
  • Independent component analysis
  • Monitoring
  • Road transportation
  • Surgery

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