Table 1.

Correlation between stimulus distributions and class structure (session 4)

Stimulus distribution	Subject group
	3-peak	4-peak	Uniform
Correlation with class centers
3 peaks	0.80	−0.03	−0.01
4 peaks	−0.22	0.81	0.43
Correlation with class boundaries
3 peaks	0.72	−0.36	−0.21
4 peaks	−0.27	0.59	−0.11

Bins related to edge effect were ignored. For the boundary location histogram, the Pearson correlation was computed with stimulation infrequency: bins with likelihood <6/session were set to 1; all others to 0.