Abstract
The EEG pattern in children in secobarbital sleep showed responses to the presentation of tones generated by an audiometer. These responses consisted of an on effect (usually a K formation), a continuous effect, and off effect and a delayed reaction (arousal). Any intensity of tone was considered to be above threshold when it evoked a positive EEG response 50 per cent or more of the time. The thresholds so determined in 22 selected cases agreed with those obtained by standard audiometry to within plus or minus 18 db. Variations in response occurred with depth of sleep, quantity and type of sedative, pattern of stimulation presented, changes in the experimental procedure in the midst of the testing, as well as unknown factors presumably involving the child and mechanisms of sleep. The discussion suggested that these EEG responses were associated with some simple arousing system in the central nervous system because they were diffuse, not influenced by age from 3 months to 27 years and capable of being duplicated by other sensory modalities. These thresholds have great clinical usefulness if combined with all other information and not made the sole basis for clinical judgement. They extend the measurement of auditory profiles into those infants and handicapped children who do not communicate.
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