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Related Experiment Videos

2-Deoxyglucose uptake during vocalization in the squirrel monkey brain.

Uwe Jürgens1, Ludwig Ehrenreich, Nihal C De Lanerolle

  • 1German Primate Centre, Kellnerweg 4, 37077 Göttingen, Germany. ujerge@gwdg.de

Behavioural Brain Research
|November 14, 2002
PubMed
Summary

Vocalization in squirrel monkeys involves widespread brain activity, not just known pathways. Enhanced 2-deoxyglucose uptake reveals an extensive neural network supporting vocal communication.

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Area of Science:

  • Neuroscience
  • Animal Behavior

Background:

  • Vocalization is crucial for social interaction in many species.
  • The periaqueductal grey (PAG) is traditionally considered a key center for vocalization control.

Purpose of the Study:

  • To investigate the neural network underlying vocalization in squirrel monkeys (Saimiri sciureus).
  • To compare brain activity during vocalization versus non-vocalization states.

Main Methods:

  • Electrical stimulation of the periaqueductal grey (PAG) in squirrel monkeys.
  • Measurement of cerebral 2-deoxyglucose uptake to map metabolic activity.
  • Comparison of uptake between vocalizing and non-vocalizing subjects.

Main Results:

  • Significantly higher 2-deoxyglucose uptake was observed in vocalizing monkeys compared to non-vocalizing ones.

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  • This increased activity was detected across a broad range of brain regions, including the prefrontal cortex, motor areas, cingulate cortex, hypothalamus, midbrain, and brainstem nuclei.
  • Specific areas with heightened activity included the dorsolateral prefrontal cortex, supplementary motor area, anterior/posterior cingulate cortex, primary motor cortex, claustrum, centrum medianum, perifornical hypothalamus, PAG, intercollicular region, dorsal mesencephalic reticular formation, peripeduncular nucleus, substantia nigra, nucleus ruber, paralemniscal area, trigeminal motor nuclei, solitary tract nucleus, nucleus ambiguus, nucleus retroambiguus, nucleus hypoglossus, ventral raphe, and medullary reticular formation.

    • Conclusions:

    • Vocalization, even innate patterns, relies on an extensive and distributed neural network.
    • This network extends far beyond the previously understood pathways involving the PAG, nucleus retroambiguus, and cranial motor nuclei.
    • The findings highlight the complex neural architecture supporting vocal communication.