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Psicothema was founded in Asturias (northern Spain) in 1989, and is published jointly by the Psychology Faculty of the University of Oviedo and the Psychological Association of the Principality of Asturias (Colegio Oficial de Psicólogos del Principado de Asturias).
We currently publish four issues per year, which accounts for some 100 articles annually. We admit work from both the basic and applied research fields, and from all areas of Psychology, all manuscripts being anonymously reviewed prior to publication.

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Psicothema, 2009. Vol. Vol. 21 (nº 3). 382-389




Replicated nil associations of digit ratio (2D:4D) and absolute finger lengths with implicit and explicit measures of aggression

Martin Voracek and Stefan Stieger

University of Vienna (Austria)

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.

Replicación de asociaciones nulas del ratio del segundo y cuarto dedo (2D:4D) y la longitud absoluta de los dedos con medidas de agresión implícitas y explícitas. Evidencias preliminares sugieren que la variabilidad intersexual en la relación entre la longitud del 2º dedo (índice) y del cuarto dedo (2D:4D), como marcador indirecto de los niveles de andrógenos prenatales, puede poseer una fuerte y coherente relación con medidas implícitas (Test de Asociación Implícita, IAT) que corresponden a medidas explícitas (autoinforme) de rasgos de la personalidad. La lógica fundamental es que el IAT-no introspectivo puede reflejar las experiencias más tempranas e inaccesibles, mientras que los autoinformes reflejan las experiencias más recientes y necesariamente accesibles. La asociación entre el 2D:4D y la longitud absoluta del dedo (como marcador de los niveles de andrógenos en la etapa de la pubertad-adolescencia) con las medidas de agresión implícitas vs las explícitas (IAT vs. Cuestionario de Agresión de Buss-Perry y termómetro de sentimiento) fueron analizadas mediante los mismos procedimientos en dos muestras (Ns= 244 and 233). Para verificar la validez del procedimiento y la normalidad de los datos, varias experiencias de la investigación fueron replicadas en ambas muestras, incluyendo las diferencias sexuales en el 2D:4D y las de la interrelación de la teoría conformista entre medidas psicométricas.

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