For all patients, we calculated verbal memory (VM), visuospatial memory (VSM) and intelligence quotient (IQ) scores based on a previously described principal component analysis (PCA) from our lab (see detailed description in St-Laurent et al., 2014). In short, PCA was performed to reduce and summarize the number of measures obtained from extensive neuropsychological testing on 56 presurgical mTLE candidates (28 right mTLE and 28 left mTLE). Verbal memory measures included the Warrington Recognition Memory Test — Words (Warrington, 1984) and two measures from the Rey Auditory Verbal Learning Test (Strauss et al., 2006): a) the total number of recalled words over five trials and b) the percentage of words learned during the study phase that were recalled after a 20 min delay. Visuospatial memory measures included the Warrington Recognition Memory Test — Faces (Warrington, 1984), the total number of designs reproduced over five learning trials on the Rey Visual Design Learning Test (Spreen and Strauss, 1991) and the total number of trials to reach the learning criteria from the Spatial Conditional Associative Learning task (Petrides, 1985; Taylor et al., 1990).
