Recently a novel interference task was developed, that was aimed at obtaining robust patterns of interference in individual subjects, both behaviorally and neurophysiologically (Bush, Shin, Holmes, Rosen & Vogt, 2003 Bush, G., Shin, L.M., Holmes, J., Rosen, B.R. and Vogt, B.A. 2003. The Multi-Source Interference Task: Validation study with fMRI in individual subjects. Molecular Psychiatry, 8: 60–70. [PUBMED][INFOTRIEVE][CSA][CROSSREF][Crossref], [PubMed], [Web of Science ®] , [Google Scholar]). This multi-source interference task (MSIT) combined elements of spatial and flanker interference, and huge interference effects were obtained in a blocked design. This task could thus in principle be used to assess frontal abnormalities, such as ADHD. In the present study, we further examined the nature of the MSIT. We examined the effect of randomization, and the relative contribution of each type of interference. Using a group of healthy subjects, we found a much smaller interference effect than Bush et al. (2003) Bush, G., Shin, L.M., Holmes, J., Rosen, B.R. and Vogt, B.A. 2003. The Multi-Source Interference Task: Validation study with fMRI in individual subjects. Molecular Psychiatry, 8: 60–70. [PUBMED][INFOTRIEVE][CSA][CROSSREF][Crossref], [PubMed], [Web of Science ®] , [Google Scholar]. In addition, we found that most of the interference could be ascribed to flanker interference, and much less to spatial interference. It seems to be the case that there is a trade-off between obtaining robust and reliable effects, and isolating a specific psychological process.
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Stins et al. (2005) studied this question.
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