Table 4.

Variation in model performance across shape sets. Notes: To investigate whether the contribution of the simple searches vary across stimuli, the best model (Model 6) was fit separately to each stimulus set, and the resulting correlations and regression coefficients are given above. Statistical significance was p < 0.00001.

	Correlation with data	Model coefficients
		Hard distracter	Easy distracter	Distracter heterogeneity	Constant term
All sets (n = 96)	0.91****	0.60	0.45	−0.35	−0.05
Set 1 (n = 24)	0.95****	0.52	0.40	−0.40	0.13
Set 2 (n = 24)	0.89****	0.50	0.47	−0.48	0.17
Set 3 (n = 24)	0.93****	0.69	0.45	−0.26	−0.29
Set 4 (n = 24)	0.93****	0.44	0.73	−0.45	−0.07