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Spectral density analysis of the effects of barbiturates and benzodiazepines on the electrocorticogram of the squirrel monkey

, : Spectral density analysis of the effects of barbiturates and benzodiazepines on the electrocorticogram of the squirrel monkey. Archives Internationales de Pharmacodynamie et de Therapie 223(2): 301-310

The effects of pentobarbital and diazepam were compared in a series of tests in squirrel monkeys; the effects of phenobarbital and flurazepam were compared in a second series. Observations were made of gross behavior and on the ECoG; the latter was analyzed by the spectral density technique. The two barbiturates induced sedation,which was occasionally so deep that the monkeys could not be readily aroused. The benzodiazepines induced sedation in some monkeys, but others showed signs of restlessness. The ECoG showed general slowing with the barbiturates, whereas the benzodiazepines produced mixed fast and slow patterns. Spectral density analysis showed that pentobarbital increased activity at frequencies below 40 Hz, with the largest increases occurring below 8 Hz. Phenobarbital increased activity below 8 Hz, but differed from pentobarbital by decreasing activity above 13 Hz. The benzodiazepines increased activity below 8 Hz, decreased it between 8 and 20 Hz, and increased it between 20 and 50 Hz.

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Accession: 038981055

PMID: 11759

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