title: Replicated nil associations of digit ratio (2D:4D) and absolute finger lengths with implicit and explicit measures of aggression.
abstract: Preliminary evidence suggests that within-sex individual variation in the length ratio of the index finger to the ring finger (2D:4D), a putative marker of prenatal androgen levels, may be more strongly or consistently related to implicit measures (Implicit Association Test, IAT) than to corresponding explicit (self-report) measures of candidate personality traits. The underlying logic is that the non-introspective IAT may reflect earlier and inaccessible experiences, whereas introspective self-reports reflect more recent and necessarily accessible experiences. Associations of 2D:4D and absolute finger length (a marker of pubertal-adolescent androgen levels) with implicit versus explicit aggression measures (IAT vs. Buss-Perry Aggression Questionnaire and a feeling thermometer) were examined in two samples with identical procedures (Ns=244 and 233). Attesting to procedural validity and data typicality, several experiments of related research were replicated in both samples, including sex differences in 2D:4D and theory compliant interrelations among psychometric measures. However, no theory compliant, reliable, or replicable associations of 2D:4D or finger length with implicit or explicit aggression measures resulted. These nil findings cast doubt on hypothesized advantages of implicitly (over explicitly) measured target traits for 2D:4D research. More generally, they add to a growing number of replication failures in this area.
authors.affiliation: University of Vienna, Department of Psychological Research, School of Psychology, Vienna, Austria. martin.voracek@univie.ac.at
authors.forename: Martin
authors.initials: M
authors.lastname: Voracek
authors.forename: Stefan
authors.initials: S
authors.lastname: Stieger
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000374:Aggression / Q000523:psychology*; D005260:Female; D005385:Fingers / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult