Figure 5.

The parameter estimate vectors, $\overrightarrow{\beta }$ = (β_N, β_SzA, β_Sp) (red asterisks) and their 99.9% confidence regions (red ovals) in the parameter space from Experiment 1. The right-most diagram illustrates the angle between $\overrightarrow{\beta }$ and each axis of stimulus properties. The angles between $\overrightarrow{\beta }$ and the closest axis are shown with their 99.9% confidence intervals in closed brackets. The P-values indicate the statistical significance of the test comparing the difference between the angle between $\overrightarrow{\beta }$ and the closest axis and the angle between $\overrightarrow{\beta }$ and the next closest axis.