. 2008 Jan;89(1):49–69. doi: 10.1901/jeab.2008.89-49

Table 5.

Results of fitting a logistic function (Equation 5) to the predicted values in Figure 12. Parameters c, d, and τ were estimated for each subject using a nonlinear optimization procedure. R² represents the variance accounted for by Equation 5, R²_inc represents the improvement in variance accounted for by Equation 5 over a linear model (Equation 4a). Range refers to the degree of shift in preference, that is, to the difference between the mean log response ratio in left-dominated sessions and the mean log response ratio in right-dominated sessions.

Pigeon	Logistic Parameters			R²	R²_inc	Range
Pigeon	d	c	τ	R²	R²_inc	Range
191	−1.54	3.12	0.71	0.98	0.01	1.74
192	−1.07	2.15	0.37	1.00	0.04	1.98
193	−1.17	2.40	0.32	0.99	0.10	2.34
194	−1.17	2.39	0.31	1.00	0.11	2.37