Initial analyses revealed that there was no influence of the APOE ε 4 allele on free recall performance, which is in line with previous research showing limited influence of APOE ε 4 on cognition in individuals free of dementia (Small et al., 2000), especially when accounting for preclinical dementia (Savitz et al., 2006; Laukka et al., 2013). This evidence concerns the gene APOE and dementia.