Figure 5.

Model comparison by differences in the Akaike information criterion (AIC) scores in the parallel models (P models). The AIC scores of the P models were compared. One of the models has no forgetting process (P), and the other three have a forgetting rate parameter for the forgetting process and either of a free default-value parameter (P-FD), a fixed default value of 0 (P-F0), or a default value of 0.5 (P-F05). (A) The P-FD model was favored over the P model (red bars favor the P-FD model, and blue bars favor the P model). (B) By including a default-value parameter, the data fit was improved (red bars favor the P-FD model, and blue bars favor the P-F0 model). (C) No statistically significant improvement was observed by fixing the default value at 0.5 (red bars favor the P-F05 model, and blue bars favor the P-FD model). Note that the scales of the vertical axis are different among the panels.