STUDY ALERT: Intelligence and the brain: A model-based approach

February 15, 2012 in Study Alerts

Intelligence and the brain: A model-based approach

Rogier A. Kievit, Hilko van Rooijen, Jelte M. Wicherts, Lourens J. Waldorp, Kees-Jan Kan, H. Steven Scholte, and Denny Borsboom

Various biological correlates of general intelligence (g) have been reported. Despite this, however, the relationship between neurological measurements and g is not fully clear. We use structural equation modeling to model the relationship between behavioral Wechsler Adult Intelligence Scale (WAIS) estimates of g and neurological measurements (voxel-based morphometry and diffusion tensor imaging of eight regions of interest). We discuss psychometric models that explicate the relationship between g and the brain in a manner in line with the scientific study of g. Fitting the proposed models to the data, we find that a MIMIC model (for multiple indicators, multiple causes), where the contributions of different brain regions to a unidimensional g are estimated separately, provides the best fit against the data.

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