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Electrical activity of the cingulate cortex. II. Cholinergic modulation.

J G Borst, L W Leung, D F MacFabe

    Brain Research
    |March 24, 1987
    PubMed
    Summary

    Cholinergic pathways modulate cingulate cortex activity, influencing irregular slow activity and EEG-spikes. Specific pathways are key for generating cingulate theta rhythm, independent of hippocampal theta.

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    Area of Science:

    • Neuroscience
    • Neurophysiology
    • Cholinergic System

    Background:

    • The cholinergic system significantly influences brain activity and cognitive functions.
    • Cingulate cortex electrical activity exhibits distinct patterns related to behavioral states like immobility and locomotion.

    Purpose of the Study:

    • To investigate the role of cholinergic innervation in modulating cingulate cortex electrical activity.
    • To determine the origins and pathways of cholinergic influence on cingulate EEG patterns.

    Main Methods:

    • Pharmacological manipulations using atropine sulfate, atropine methyl nitrate, and pilocarpine.
    • Brain lesions targeting substantia innominata, ventral globus pallidus, medial septal nuclei, and diagonal band nuclei.
    • Electrophysiological recordings of cingulate cortex EEG in rats during different behavioral states.

    Main Results:

    • Atropine sulfate increased irregular slow activity (ISA) and EEG-spikes, while pilocarpine suppressed them and induced theta rhythm.
    • Lesions of substantia innominata and ventral globus pallidus had no significant effect on cingulate EEG.
    • Medial septal lesions abolished hippocampal theta but, in some cases, revealed an independent cingulate theta rhythm.

    Conclusions:

    • Cholinergic afferents from the medial septum and diagonal band nuclei suppress ISA and EEG-spikes and contribute to cingulate theta generation.
    • Evidence suggests an atropine-resistant pathway and a theta-suppressing pathway are involved in cingulate theta generation.
    • The cingulate cortex possesses an intrinsic theta rhythm independent of the hippocampus, modulated by cholinergic input.

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