Auditory evoked cortical responses (AECR) were studied in three groups of children (8 to 15 years old): normal dextrals, retarded dextrals, and retarded sinistrals. Hemispheric asymmetry of the maximum amplitude of the AECR was found in the following pattern: left greater than right in normal dextrals, right greater than left in retarded dextrals, and no difference in the retarded sinistrals.

If this preliminary sign based on AECR asymmetry were employed for the 15 subjects, there would have been one false positive, and two false negatives (both sinistrals).

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