Muscarinic Versus Nicotinic Modulation of a Visual Task A PET Study Using Drug Probes
| Autor: | Barbara Levine, Stanley I. Rapoport, Sandeep Sobti, Trey Sunderland, Mark B. Schapiro, Jennifer Lai, Marc J. Mentis, Jack S. Krasuski, Catherine Connolly, Judy Friz |
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| Rok vydání: | 2001 |
| Předmět: |
Male
Physostigmine genetic structures Scopolamine Muscarinic Antagonists Neuropsychological Tests Receptors Nicotinic Stimulus (physiology) Double-Blind Method Muscarinic acetylcholine receptor Muscarinic acetylcholine receptor M4 medicine Humans Attention Aged Brain Chemistry Pharmacology Middle Aged Receptors Muscarinic Psychiatry and Mental health Nicotinic agonist Visual cortex medicine.anatomical_structure Cerebrovascular Circulation Visual Perception Female Cholinesterase Inhibitors Psychology Neuroscience Photic Stimulation Acetylcholine Tomography Emission-Computed medicine.drug Brodmann area |
| Zdroj: | Neuropsychopharmacology. 25:555-564 |
| ISSN: | 0893-133X |
| DOI: | 10.1016/s0893-133x(01)00264-0 |
| Popis: | Little is known about acetylcholine (ACh) modulation of central visual processing in humans. Receptor densities in visual brain regions are differentially distributed suggesting that receptor subtypes have different functions. Using PET, we have previously described the brain regions activated by a simple pattern-flash stimulus in healthy elderly subjects. To evaluate muscarinic and nicotinic contributions to ACh modulation of visual processing, we scanned elderly subjects watching the pattern-flash stimulus during no drug, during physostigmine augmentation, and during scopolamine antagonism of physostigmine's action. These manipulations of ACh significantly altered regional cerebral blood flow (rCBF) in brain regions activated by the task. The pattern of rCBF values across drug conditions suggested that muscarinic and nicotinic effects were dissociated. Muscarinic action predominated in striate cortex (Brodmann Area, BA 17) and lateral visual association areas (BA 18, 19), while nicotinic action predominated in the thalamus and inferior parietal regions (BA 39/40). Both muscarinic and nicotinic actions increased rCBF in some regions while decreasing it in others. A parsimonious reconciliation of these results with functional anatomy suggests that muscarinic action modulates visual attribute processing, while nicotinic action modulates arousal and selective attention to the visual task. |
| Databáze: | OpenAIRE |
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