Analysis of LoC subscales.

In this table we report various measures to gain insight into the structure and consistency of the LoC subscales. We performed a varimax-rotated factor analysis on the single items to obtain the factor structure of the questionnaire responses. We used four components (pχ2 = 0.1). The cumulative variance explained by the first three factors was 35%, in line with the values found in literature (see, e.g. [23]). We correlated scores (i.e. the projections of the questionnaire responses along the factors) with the I,P and C scales to see whether these were reflected (coefficients significant post false discovery correction for multiple comparisons are in bold). The results replicate well those found in literature, as they suggest that the first three factors largely reflect the 3 dimensions individuated by Levenson (Levenson 1974). Although the fourth factor appears to individuate a further, non-specific external component (as it is anticorrelated with I-scores, and weakly positively correlated with C and P scores) none of its correlation coefficients reach significance, which suggests that the variability that this dimension captures is not enough to warrant adding a further dimension. Finally, we report internal consistency measures, along with 95% confidence intervals, in the last column.