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The metabolic brain pattern of young subjects given scopolamine

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Abstract

The effect of an intravenous dose of 0.5 mg of scopolamine on the functional brain activity of normal subjects performing auditory discrimination (CPT) was determined in two independent positron emission tomography studies with [18F] 2-fluoro-deoxyglucose. In the first preliminary study, the most significant effect found was a reduction in the functional activity of the thalamus. In the second “hypothesis-testing” study, an equally prominent effect on thalamic functional activity was seen. Because the second study was performed on a high-resolution scanner with improved methodology, we re-examined scopolamine's effects on those brain regions established as determinants of CPT. Of the regions affected, the reduction in cingulate and the increase in basal ganglia metabolic rates were the most notable. We concluded that scopolamine's effects on the functions of thalamic, cingulate and basal ganglia are the likely causes of scopolamine's well-described attention-altering properties. Alterations in these same brain structures could be responsible for scopolamine's effects on other cognitive functions, e.g., memory. Alternatively, scopolamine's effects on other brain structures such as the hippocampus and frontal cortex could underlie scopolamine's effects on these other cognitive functions. Studies of scopolamine's regional metabolic effects in subjects performing these other cognitive tasks at more than a single dose and at more than one post-drug time are needed to discriminate between these two possibilities.

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Authors and Affiliations

  1. Clinical Brain Imaging Section, LCM, NIMH, IRP, 9000 Rockville Pike, Bldg 10/4N317, 20892-1000, Bethesda, MD, USA

    Robert M. Cohen, Michael Gross, William E. Semple & Thomas E. Nordahl

  2. Clinical Neuropharmacology Section, LCS, NIMH, 9000 Rockville Pike, 20892-1000, Bethesda, MD, USA

    Trey Sunderland

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  1. Robert M. Cohen
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  4. Thomas E. Nordahl
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  5. Trey Sunderland
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Cohen, R.M., Gross, M., Semple, W.E. et al. The metabolic brain pattern of young subjects given scopolamine. Exp Brain Res 100, 133–143 (1994). https://doi.org/10.1007/BF00227285

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