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Dopamine neurons in the midbrain respond to behavioral events and environmental stimuli. Their different patterns of activation in turn modulate the activity of forebrain regions and modulate the expression of selective behavioral responses. However, their activity is closely dependent on the cholinergic systems in the brainstem. Ascending cholinergic projections from the pedunculopontine and laterodorsal tegmental nuclei target dopaminergic neurons in the substantia nigra compacta and ventral tegmental area following a topographical gradient. These projections, by means of the activation of acetylcholine receptors, influence the firing of dopamine neurons and therefore their responsiveness, ultimately affecting the release of dopamine in their forebrain targets. Brainstem cholinergic neurons are thus in a position to critically influence the activity of dopaminergic neurons in the midbrain, and thereby have a critical role in the expression of behavior.

Original publication

DOI

10.1016/j.brainresrev.2008.02.003

Type

Journal article

Journal

Brain Res Rev

Publication Date

08/2008

Volume

58

Pages

265 - 271

Keywords

Acetylcholine, Animals, Dopamine, Humans, Mesencephalon, Neural Pathways, Neurons