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(a) Response Times (RT) in a Cued Letter Discrimination Task Plotted for the ε2, ε3, and ε4 ApoE Genotype Groups as a Function of Cue Validity and SOA, and (b) the Total Cue Validity Effect (Invalid – Valid RT) for Each ApoE Group and SOA. SOURCE: (d) From Greenwood, Sunderland, Friz, and Parasuraman, 2000. NOTE: ApoE = apolipoprotein E; SOA = stimulus onset asynchrony. (a) 200 ms, (b) 500 ms, and (c) 2000 ms.
