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Related Experiment Videos

Cholinergic modulation of mediodorsal thalamic input into cingulate cortex.

R W Sikes, J F Defrance

    Brain Research
    |October 21, 1985
    PubMed
    Summary

    Cholinergic stimulation via carbachol reduced electrical field potentials in the cingulate cortex. This effect was frequency-dependent and blocked by muscarinic antagonists, suggesting a role for muscarinic receptors in modulating thalamocortical pathways.

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    Area of Science:

    • Neuroscience
    • Cholinergic system
    • Thalamocortical pathways

    Background:

    • The cingulate cortex plays a role in cognitive and emotional processing.
    • Cholinergic neurotransmission modulates neural activity in various brain regions.
    • Thalamocortical pathways are crucial for information transfer between the thalamus and cortex.

    Purpose of the Study:

    • To investigate the effect of cholinergic stimulation on field potentials in the cingulate cortex.
    • To determine the frequency dependence of carbachol's effect.
    • To identify the type of cholinergic receptor involved.

    Main Methods:

    • Electrical stimulation of the mediodorsal thalamic nucleus.
    • Iontophoretic ejection of carbachol, a cholinergic agonist.

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  • Recording of field potentials in the cingulate cortex (area 24).
  • Assessment of frequency-dependent effects (7.0 Hz vs. 0.5 Hz stimulation).
  • Use of muscarinic and nicotinic antagonists to block receptor activity.

    • Main Results:

    • Carbachol significantly reduced field potentials evoked by 7.0 Hz stimulation by 34%.
    • Field potentials evoked by 0.5 Hz stimulation were not significantly affected.
    • The reduction in field potentials was blocked by muscarinic antagonists.
    • Nicotinic antagonists did not block the effect.

    Conclusions:

    • Cholinergic activation, specifically via muscarinic receptors, inhibits thalamocortically evoked field potentials in the cingulate cortex.
    • The inhibitory effect is dependent on the frequency of stimulation.
    • This finding highlights the role of the cholinergic system in regulating information flow within thalamocortical circuits.