Table 1.

Summary of sustained and transient cells for each sample studied

	Sustained	Transient	Total
Overall sample
No synaptic impact	9	1	10
Layer 4 only	37	25	62
Layers 4 and 6	5	3	8
Layer 6 only	1	0	1
Totals	52	29	81
Subsample A
No synaptic impact	6	1	7
Layer 4 only	28	21	49
Layers 4 and 6	5	3	8
Layer 6 only	1	0	1
Totals	40	25	65
Subsample B	17	17	34
Subsample C	10	9	19

The numbers of cells generating a postsynaptic response, in particular cortical layers, is provided for sustained and transient cells from the overall sample and for subsample A. Note that the three subsamples were drawn from the overall sample and were not mutually exclusive. The motivation and criteria for selection of these three subsamples is described in Materials and Methods.