Table 1.

Effects of surround stimuli and of attention on amplitude, baseline and half width-half heights (HWHH) of the tuning functions n = 70

	Attend away (median [25% 75%])	Attend RF (median [25% 75%])	P(surr.)	P(att.)	P(surr*att.)
HWHH
No surround	24.21 [15.79 34.80]	23.98 [18.02 35.85]	0.880	0.732	0.404
Surround	23.58 [16.16 37.85]	24.11 [15.52 32.89]
Amplitude
No surround	21.27 [13.32 39.69]	26.70 [12.32 41.18]	0.631	0.018	0.654
Surround	22.26 [11.70 33.53]	23.00 [15.33 37.90]
Baseline
No surround	17.90 [11.62 29.54]	19.22 [11.32 31.29]	< 0.001	0.002	0.772
Surround	12.27 [7.80 22.18]	14.24 [8.16 26.26]

The values in the left two columns show the median [25/75 percentiles] of the respective value distributions. The three columns to the right show P-values (two-factor repeated-measures anova) relating to the effects of surround stimuli (surr.), of attention (att.) and the possible interaction between the two factors (surr^*att.).