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Behavioral Assessment of Manual Dexterity in Non-Human Primates
16:00

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Published on: November 11, 2011

Default mode of brain function in monkeys.

Dante Mantini1, Annelis Gerits, Koen Nelissen

  • 1Laboratory for Neuro-Psychophysiology, K.U. Leuven Medical School, Leuven 3000, Belgium.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 9, 2011
PubMed
Summary
This summary is machine-generated.

Researchers found a default-mode network (DMN) in monkeys, similar to humans. This brain network shows decreased activity during goal-directed tasks, suggesting internal processing modes in non-human primates.

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Area of Science:

  • Neuroscience
  • Comparative Cognition
  • Neuroimaging

Background:

  • The human default-mode network (DMN) deactivates during goal-directed tasks.
  • Evidence for a similar network in monkeys has been largely indirect, relying on functional connectivity.
  • Previous studies lacked direct evidence of task-related activity decreases in monkeys.

Purpose of the Study:

  • To investigate the existence of a functional equivalent of the human DMN in monkeys.
  • To identify brain regions exhibiting consistent activity decreases during externally oriented tasks in monkeys.
  • To characterize the functional connectivity and network structure of the monkey DMN.

Main Methods:

  • Meta-analysis of functional magnetic resonance imaging (fMRI) data from 10 awake monkeys.
  • Analysis of 15 experiments focusing on activity changes during passive versus externally oriented tasks.
  • Resting-state functional connectivity analysis to identify DMN core and subsystems.

Main Results:

  • Task-related, spatially specific deactivations were observed, supporting a monkey DMN.
  • Prefrontal and medial parietal regions (areas 9/46d, 31) form the DMN core.
  • Two distinct subsystems were identified within the DMN, with partial consistency with anatomical data.

Conclusions:

  • Monkeys possess a functional equivalent of the human DMN, characterized by decreased activity during goal-directed behavior.
  • The monkey DMN exhibits a core structure and distinct subsystems, suggesting complex internal processing.
  • Findings indicate that monkeys, like humans, may default to internal processing modes when not actively engaged with the environment.