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The visual superior colliculus and pulvinar.

D L Robinson1, J W McClurkin

  • 1Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, MD 20892.

Reviews of Oculomotor Research
|January 1, 1989
PubMed
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The superior colliculus and pulvinar play key roles in initiating and executing saccadic eye movements, influencing visual spatial attention and target selection. Their coordinated actions guide eye movements and attentional shifts, with specific areas involved in different stages of the process.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • The superior colliculus and pulvinar are critical brain regions involved in visual processing and eye movement control.
  • Understanding their precise roles in saccadic eye movements is essential for deciphering visual attention mechanisms.

Purpose of the Study:

  • To elucidate the functional relationships between the superior colliculus, pulvinar, and the initiation of saccadic eye movements.
  • To delineate the specific contributions of different sub-regions within the pulvinar and superior colliculus to visual spatial attention and target selection.

Main Methods:

  • Review and synthesis of existing neurophysiological and lesion data.
  • Analysis of neuronal activity patterns in relation to visual stimuli and eye movements.

Related Experiment Videos

  • Examination of the effects of pharmacological manipulations on attentional performance.

    • Main Results:

    • Area Pdm of the pulvinar is implicated in visual spatial attention and may initiate attentional shifts, potentially in coordination with cortical area 7.
    • Visual cells in the superficial layers of the superior colliculus are involved in target selection for saccadic eye movements.
    • Neuronal activity in both regions is modulated during eye movements, with some cells becoming unresponsive to visual stimuli, possibly to prevent erroneous target selection or for perceptual reasons.

    Conclusions:

    • The superior colliculus and pulvinar provide distinct, yet coordinated, inputs to the saccadic system for initiating eye movements.
    • Specific pulvinar cells may regulate the transition between attentional states.
    • The exact pathways mediating these functions remain to be fully determined, but likely involve extensive cortico-pulvinar connections.