The effects of age and sex on the serum levels of vitamin B12 were determined after an overnight fast in 80 adult ambulatory, disease-free persons who had undergone rigorous health screening and neuropsychological testing. No significant age or sex differences were found. When adjusted for the effects of age and education, it appeared that individual vitamin B12 levels influenced cognitive functioning, in that subjects with lower vitamin B12 levels performed the Stroop test significantly less well than persons with higher levels of the vitamin, especially on a modified subtask of increased complexity.
|Number of pages||4|
|Journal||Neuroscience Research Communications|
|Publication status||Published - 1 Jan 1992|