Table 1.

Layer-specific neuronal firing rate modulations

	Modulated, %	Facilitated, %	Suppressed, %	Multiphasic, %
Layers II/III	69.80	41.49	26.60	31.91
Layer IV	82.81	44.63	20.76	34.61
Layers V/VI	85.42	34.49	20.91	44.60
	χ2	df	P	Significance
	14.46	4	0.006	*

The leftmost column of the table shows the fraction of cells with firing rate modulations during a trial for each layer (% modulated). In every layer, a very large proportion of cells presented facilitated, suppressed, or multiphasic (a combination of both types) firing rate modulations during the task. The three columns in the right show the different proportions of neurons that presented each type of firing modulation. Multiphasic modulations were more likely to occur in layers V/VI (also see χ² test for statistical significance).

^*P < 0.01.