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AUDITORY BRAIN STEM POTENTIALS WITH ALCOHOL 1

Ethyl alcohol is known to be associated with a decrease in the amplitudes of sensory evoked potentials, particularly those originating from association areas of the cortex (Schweigerdt et al. 1965; Gross et al. 1966; Himwich et al. 1966; DiPerri et al. 1968; Lewis et al. 1969, 1970; Soveri and Fruhstorfer 1969; Begleiter et al. 1972; Himwich and Callison 1972; Salamy and Williams 1973; Kalant 1974; Perrin et al. 1974; Grenell 1975; Rhodes et al. 1975; Obitz e t a l . 1977; Kopell et al. 1978). At more peripheral levels of the sensory systems the effect of alcohol is generally markedly reduced or absent (Dravid et al. 1963; Schweigerdt et al. 1965; Himwich et al. 1966; DiPerri e t a l . 1968; Lewis et al. 1969, 1970; Himwich and Callison 1972; Nakai et al. 1973; Salamy and Williams 1973; Rhodes et al. 1975), though amplitude reductions for auditory evoked potentials have been observed as far peripherally as the inferior colliculus (DiPerri et al. 1968). At present, however, it is impossible to conclude at what level of sensory transmission alcohol has its first effect, because simultaneous recordings of evoked potentials from throughout the brain have not been performed. The auditory system is uniquely suited for such a study because the sequential activation of neural structures along the brain stem auditory pathway can be recorded from electrodes as far distant from the brain stem as the scalp (Jewett et al. 1970; Plantz e ta l .