Table 3.

Acoustic properties of the perceptron weights from the SOM layer, given the acoustic features of the SOM nodes (shown in Table 2).

		Spectral meana	Spectral SDa	Temporal medianb
Age	3;0–5;4	0.80	0.91	4.11
	6;0–8;4	0.75	0.89	4.67
	9;0–11;4	0.87	0.95	4.84
Protophone	Vocant	0.78	0.89	4.49
	Squeal	0.85	0.96	4.69
	Growl	0.80	0.91	4.68
Infant	Infant 1	0.81	0.94	4.55
	Infant 2	0.83	0.93	4.62
	Infant 3	0.82	0.94	4.69
	Infant 4	0.77	0.87	4.47
	Infant 5	0.89	0.95	5.12
	Infant 6	0.84	0.92	4.41

^aIn kilohertz.

^bIn number of time bins (each bin is 66 ms).