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Some collicular efferent neurons code saccadic eye velocity.

A Berthoz, A Grantyn, J Droulez

    Neuroscience Letters
    |December 23, 1986
    PubMed
    Summary
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    This study reveals that tecto-reticulo-spinal neurons (TRSNs) in cats generate presaccadic bursts linked to saccadic eye velocity during visual orienting. This correlation is strongest when cats track moving targets, highlighting TRSNs

    Area of Science:

    • Neuroscience
    • Oculomotor control
    • Visual-motor integration

    Background:

    • Tecto-reticulo-spinal neurons (TRSNs) play a role in orienting behaviors.
    • Understanding the precise function of TRSNs in visuomotor transformations is crucial.
    • Previous research has not fully elucidated the relationship between TRSN activity and eye movements during target pursuit.

    Purpose of the Study:

    • To investigate the activity patterns of TRSNs in alert cats during visually guided orienting.
    • To quantitatively analyze the relationship between TRSN burst activity and saccadic eye velocity.
    • To determine the conditions under which TRSNs exhibit visuomotor properties.

    Main Methods:

    • Recording neuronal activity of identified TRSNs in alert, head-fixed cats.

    Related Experiment Videos

  • Simultaneous recording of eye movements and dorsal neck muscle activity.
  • Quantitative analysis of TRSN burst parameters during orienting to moving visual stimuli.

    • Main Results:

    • Identified TRSNs generated presaccadic bursts with activity profiles correlated to saccadic eye velocity.
    • This correlation was observed specifically during orienting saccades to 'catch' a moving target in the neuron's preferred visual field direction.
    • The latency between TRSN bursts and saccades varied with attention and saccade direction.

    Conclusions:

    • TRSNs exhibit visuomotor properties, with their activity closely linked to saccadic eye movements during target pursuit.
    • The findings suggest TRSNs are involved in the precise control of orienting eye movements.
    • Attention and target trajectory significantly modulate the timing of TRSN activity relative to saccades.