A DOUBLE BLIND STUDY OF VITAMIN B₆ IN DOWN'S SYNDROME INFANTS. PART 2—CORTICAL AUDITORY EVOKED POTENTIALS

Cortical auditory evoked potentials (CAEPs) were recorded at 1 and at 3 years of age in 19 children with Down's syndrome participating in a double blind trial of vitamin B₆ and placebo begun in early infancy and continued for 3 years. CAEPs have previously been shown to have abnormally high amplitude in Down's syndrome patients. The CAEPs of the patients in the B₆‐treated and placebo groups were compared. Only minor effects were found in the CAEPs recorded at 1 year of age. At 3 years of age, however, comparison of the B₆‐treated group and the placebo group revealed significant differences in both amplitudes and latencies of CAEP components. Peak to peak amplitudes of prominent components were significantly lower in B₆‐treated patients than in their placebo controls. Amplitude correlated in some cases with whole blood serotonin levels. Latencies for several prominent evoked peaks were significantly longer in B₆‐treated patients.