Chunk #9 — 1. Methods — 1.2. Measures — 1.2.3. LBC1921

Source: Whole genome association scan for genetic polymorphisms influencing information processing speed.
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Digit symbol, simple RT, 4-choice RT and inspection time were measured as per the protocol described for the LBC1936. A general factor, explaining 63% of variance, was calculated from a principal components analysis of digit symbol, 4-choice RT mean and inspection time.