Figure 1.

Variable construction and structural equation model. Fronto‐parietal gray matter volume (FPN), white matter efficiency, and their relation to general cognitive ability (GCA). Matrix Reasoning (MR), Block Design (BD), and Similarities (SM) from the Wechsler Abbreviated Scale of Intelligence‐II (WASI‐II), Coding (CD) from the Wechsler Adult Intelligence Scale‐IV (WAIS‐IV), and a Vocabulary (VC) test, caudal anterior cingulate volume (CAC), caudal middle frontal (CMF), rostral middle frontal (RMF), and superior parietal (SP). [Color figure can be viewed at http://wileyonlinelibrary.com.]