Abstract

Aggressive tendencies can be assessed either commonly by explicit measures (self-report questionnaires), or by implicit measures that require the speeded classification of quickly presented stimuli and the recording and analysis of the reaction-times. We explored the psychometric properties of implicit measures assessing aggressiveness objectively: the Implicit Association Test (IAT) and its derivate, the Single-Target IAT. While the IAT focused on the automatic attitude towards aggressiveness, the ST-IAT focused on the self-concept. This feasibility study describes in methodological detail how a diversity of game players can be recruited to take these measures with common web-browser technology, even though reaction-time measurement in the range of a few hundred milliseconds is at stake. Self-reported and objective characteristics of users of violent, less violent, and no games differed. The results are partly in line with what can be expected on the basis of psychological theorizing, but structural-equation modelling shows that implicit measures on attitudes and self-concept differ in quality. Pitfalls and challenges for internet studies on computer players involving reaction-time measures are pointed out.

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