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Related Experiment Videos

Visual-auditory interactions modulate saccade-related activity in monkey superior colliculus

M A Frens1, A J Van Opstal

  • 1University of Nijmegen, Department of Medical Physics and Biophysics, The Netherlands. FRENS@FYS1.FGG.EUR.NL

Brain Research Bulletin
|July 17, 1998
PubMed
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Bimodal sensory stimulation significantly altered saccade-related burst neuron (SRBN) activity in the superior colliculus (SC), impacting saccade latency but not accuracy. This suggests SRBNs may not encode motor error, despite sensory-driven firing rate changes.

Area of Science:

  • Neuroscience
  • Oculomotor control
  • Sensory integration

Background:

  • The superior colliculus (SC) plays a crucial role in controlling saccadic eye movements.
  • Saccade-related burst neurons (SRBNs) in the SC are thought to be involved in motor planning and execution.
  • Understanding how sensory information influences SRBN activity is key to deciphering oculomotor control.

Purpose of the Study:

  • To investigate the effect of bimodal (visual-auditory) sensory stimulation on SRBN activity in the monkey SC.
  • To determine if SRBNs encode dynamic motor error during saccade generation under varying sensory conditions.
  • To examine the relationship between sensory stimulus proximity and saccade latency.

Main Methods:

  • Recorded single-unit activity of SRBNs in the intermediate and deep SC layers of monkeys.

Related Experiment Videos

  • Monkeys performed unimodal visual and bimodal visual-auditory saccade tasks.
  • Analyzed SRBN activity, saccade accuracy, kinematics, and latency in response to different sensory stimuli.

    • Main Results:

    • Bimodal stimulation significantly affected the activity of 90% of SRBNs, altering their motor-related bursts.
    • Saccade accuracy and kinematics were not influenced by auditory stimuli, but saccade latency was affected in most experiments.
    • SRBN firing rates showed spatial modulation, correlating with saccade latency variations based on stimulus separation.

    Conclusions:

    • SRBN activity is modulated by multisensory integration, even when sensory stimuli do not alter saccade accuracy.
    • The observed activity patterns challenge the hypothesis that SRBNs encode dynamic motor error.
    • Sensory context, particularly the spatial relationship between stimuli, influences SC neural activity and saccade timing.