Table 2.

attentional modulation of mean spike counts of excitatory and inhibitory neurons in layer 1, 2 and 3 through AMPA receptors

	Mean spike count Unattended (mean $\pm$ s.e.m.) ${\sigma }_{\mathit{AMPA}}=0.08$(excitatory) ${\sigma }_{\mathit{AMPA}}=0.09$(inhibitory)	Mean spike count Attended (mean $\pm$ s.e.m.) ${\sigma }_{\mathit{AMPA}}=0.075$(excitatory) ${\sigma }_{\mathit{AMPA}}=0.075$(inhibitory)	Increased percentage $\frac{(R_{att.}-R_{unatt.})}{R_{unatt.}}$ (%)	Significance test between excitatory and inhibitory neurons
Layer 1
Excitatory	$13.33\pm 0.03$	$13.43\pm 0.03$	0.75ns	Absolute increase (ns)
Inhibitory	$42.19\pm 0.01$	$42.32\pm 0.01$	0.31ns	Relative increase (ns)
Layer 2
Excitatory	$8.151\pm 0.06$	$8.57\pm 0.06$	4.83**	Absolute increase (**)
Inhibitory	$14.50\pm 0.09$	$16.32\pm 0.07$	11.15**	Relative increase (**)
Layer 3
Excitatory	$5.05\pm 0.08$	$5.54\pm 0.08$	8.81**	Absolute increase (**)
Inhibitory	$6.95\pm 0.11$	$8.67\pm 0.10$	19.76**	Relative increase (**)

Remark: $R_{att.}$ represents the mean spike count in the attention attended condition and $R_{unatt.}$ represents the activity in the attention unattended condition. The increased percentage indicates attentional modulation of firing rates. Statistical significance between the attention attended and unattended conditions was checked by Mann–Whitney U test (indicated in the column of Increased percentage, ns: p  > 0.05; **: p  < 0.01) for each type of neurons in each layer. Statistical significance of attention-modulated effects were calculated between excitatory and inhibitory neurons from the same layer in Absolute and Relative increases by Mann–Whitney U test (ns p  > 0.05; **p  < 0.01), respectively