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Continuous Performance Test (CPT). Omission errors. N = 8 subjects in each of the 4 subgroups. The dosing test was conducted at 32 months of age, 20 months after initiation of dosing. The post dosing test was conducted 6–10 months after discontinuation of dosing at 42–46 months of age. Mean of 14–16 CPT sessions (dosing) or 16–20 sessions (post-dosing). Group mean ± s.e.m. are shown. See text for details of statistical analysis.
