Table 2.

Prevalence of spike discharge and discharge patterns (bursting vs slow irregular firing)

Type of neuron	Immature rats		Adult rats
Type of neuron	Bursts	Irregular	Bursts	Irregular
A₀-neurons
At resting potential	1 /54	2 /54	1 /80	0 /80
Depolarized	10 /54	2 /54	8 /80^2-a	0 /80
A_INF-neurons
At resting potential	0 /19	0 /19	0 /15	0 /15
Depolarized	0 /19	0 /19	0 /15	1 /15
C-neurons
At resting potential	0 /12	0 /12	0 /25	0 /25
Depolarized	0 /12	0 /12	0 /25	3 /25^2-b

↵F2-a In one of these eight neurons firing was tonic (i.e., without interruptions).
↵F2-b One of these three neurons shifted from irregular to tonic firing (at 15 imp/sec) when deeply depolarized.