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Auditory pathways in the budgerigar. II. Intratelencephalic pathways.

S E Brauth1, C M McHale

  • 1Department of Psychology, University of Maryland, College Park.

Brain, Behavior and Evolution
|January 1, 1988
PubMed
Summary

This study maps auditory pathways in budgerigars, revealing connections from the thalamus to telencephalic areas like field L and NIDL. These pathways may support auditory feedback and vocal motor control.

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Area of Science:

  • Neuroscience
  • Avian Biology
  • Auditory System Research

Background:

  • The auditory relay nucleus of the thalamus (nucleus ovoidalis) projects to specific telencephalic areas in birds.
  • Understanding these projections is crucial for deciphering auditory processing and vocalization mechanisms.

Purpose of the Study:

  • To investigate the projections of two telencephalic areas, field L and neostriatum intermedium pars dorsolateralis (NIDL), which receive input from the nucleus ovoidalis in budgerigars.
  • To elucidate the connectivity of auditory pathways within the avian forebrain and their potential role in vocal motor control.

Main Methods:

  • Autoradiographic tracing techniques were employed to map neuronal projections.
  • Horseradish peroxidase (HRP) experiments were used to confirm projections and identify reciprocal connections.

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Main Results:

  • Neurons in field L and NIDL project to the neostriatum intermedium pars ventrolateralis (NIVL) and the rostromedial archistriatum.
  • Field L, NIDL, and NIVL receive input from the hyperstriatum ventrale (HV).
  • The rostromedial archistriatum, receiving projections from field L and NIDL, connects to contralateral auditory telencephalic areas and is adjacent to a region projecting to the medulla, including the nucleus archistriatalis robustus, which targets syrinx motoneurons.

Conclusions:

  • Auditory telencephalic projections to the rostromedial archistriatum may facilitate auditory feedback loops.
  • These pathways are potentially involved in the neural processes underlying learning and vocal motor control in budgerigars.