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Optic flow input to the hippocampal formation from the accessory optic system.

D R Wylie1, R G Glover, J D Aitchison

  • 1Department of Psychology, University of Alberta, Edmonton, Alberta, Canada, T6G 2E1.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 23, 1999
PubMed
Summary

The hippocampal formation uses self-motion cues for navigation. This study shows the accessory optic system (AOS) provides optic flow information to the hippocampal formation, aiding path integration.

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Spatial Navigation

Background:

  • The hippocampal formation is crucial for path integration, using self-motion cues for spatial behavior.
  • Current models suggest self-motion information originates from the vestibular system.
  • The accessory optic system (AOS) processes optic flow, a potential source of self-motion information.

Purpose of the Study:

  • To investigate if the avian hippocampal formation (Hp/APH) receives input from the accessory optic system (AOS).
  • To explore the role of optic flow in spatial navigation and path integration.

Main Methods:

  • Utilized retrograde (cholera toxin subunit B) and anterograde (biotinylated dextran amine) tracers.
  • Employed standard extracellular recording techniques in pigeons.

Related Experiment Videos

  • Traced projections from the nucleus of the basal optic root (nBOR) and nucleus lentiformis mesencephali to the area ventralis of Tsai (AVT) and Hp/APH.

    • Main Results:

    • Demonstrated projections from the AOS (nBOR and nucleus lentiformis mesencephali) to the AVT, and subsequently to the Hp/APH.
    • Identified a direct projection from the nBOR pars dorsalis to the hippocampus.
    • Observed that approximately half of AVT cells responded to optic flow stimuli.

    Conclusions:

    • The hippocampal formation (Hp/APH) receives self-motion information from the accessory optic system (AOS).
    • Optic flow information from the AOS is likely utilized for path integration.
    • An analogous neural circuit may exist in mammals but has been overlooked.