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Related Concept Videos

Reflex Activity01:08

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...

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Related Experiment Video

Updated: May 14, 2026

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior
07:09

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

Published on: November 14, 2018

Modelling eye-head coordination without pre-planning--a reflex-based approach.

I Haji-Abolhassani1, D Guitton, H L Galiana

  • 1Biomedical Engineering Department of McGill University, Montreal, QC H3A 2B4, Canada. iman.hajiabolhassani@mail.mcgill.ca

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

The central nervous system (CNS) uses a shared feedback controller for gaze orientation, integrating eye, head, and body movements. This model better explains coordinated movements than independent controllers.

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Last Updated: May 14, 2026

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Motor Control

Background:

  • The gaze orientation system coordinates eye, head, and body movements to fixate targets on the fovea.
  • Understanding this system offers insights into other multi-platform CNS tasks like posture and locomotion.

Purpose of the Study:

  • To evaluate two proposed network topologies for gaze orientation: independent versus shared feedback controllers.
  • To demonstrate that a shared feedback controller model better represents the CNS's strategy for gaze control.

Main Methods:

  • Analysis of neurophysiological and behavioral evidence.
  • Computer simulations using an updated Prsa-Galiana model (Shared Sensory-Motor Integration - SMI model).
  • Comparison of the SMI model with independent and shared controller models.

Main Results:

  • Simulations support the shared feedback controller model as a more plausible explanation for gaze orientation.
  • The Shared Sensory-Motor Integration (SMI) model provides coherent explanations for observed gaze shifts under various conditions.

Conclusions:

  • The CNS likely employs a shared feedback controller for gaze orientation, integrating sensory information across multiple platforms.
  • The SMI model offers a robust framework for understanding the neural mechanisms underlying coordinated gaze shifts.