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(a) Polynomial model for the MRC concreteness ratings [106] and the ANEW emotional valence ratings [107], replicating Vigliocco et al. [59]; (b) shows the same data with super-imposed Gaussian mixture models for a three-cluster solution, as determined by (c) a scree plot of Bayesian information criterion (BIC) against clusters (the mclust package [109] uses a reversed BIC scale). (Online version in colour.)
