Table 1. Fit parameters and TI metric for example CNN units.

Unit numbers are given starting at zero in each sublayer. The APC model parameters, ${\mu }_c$, ${\sigma }_c$, ${\mu }_a$ and ${\sigma }_a$, correspond to those in Equation 2. The TI metric is given by Equation 3. For visualization of preferred stimuli for example units, see Figures 9–12.

Layer	Unit	APC r	${\mu }_c$	${\sigma }_c$	${\mu }_a$	${\sigma }_a$	TI
Conv2	108	0.67	0.7	0.72	134	34	0.76
Conv2	113	0.76	0.9	0.39	134	22	0.70
Conv2	126	0.67	0.1	0.72	337	51	0.81
Conv3	20	0.68	0.5	0.01	224	171	0.90
Conv3	156	0.67	0.5	0.01	337	171	0.79
Conv3	334	0.73	0.2	0.12	157	171	0.74
Conv4	203	0.71	0.2	0.16	292	171	0.77
Conv5	144	0.65	0.9	0.29	89	30	0.89
Conv5	161	0.72	0.2	0.16	112	87	0.85
FC6	3030	0.73	−0.1	0.16	89	26	0.89
FC7	3192	0.75	0.2	0.16	112	171	0.91
FC7	3591	0.78	−0.1	0.16	112	44	0.89
FC7	3639	0.76	−0.1	0.16	112	114	0.92
FC8	271	0.73	−0.1	0.16	112	114	0.91
FC8	433	0.70	0.3	0.21	112	130	0.91
FC8	722	0.72	0.2	0.08	112	130	0.93