Table 1.

Percentage of average evoked potentials and modulation strength (±SEM) during passive viewing

	Transient phase (<200 msec)			Sustained phase (>200 msec)
	S+	S−	S+	S−	n
Evoked potentials
Area 17/18	94.3 ± 1.6	86.8 ± 2.0			46
Area 21a	91.8 ± 1.7	88.3 ± 2.0			46
Power
Area 17/18	66.86 ± 4.76	56.97 ± 3.61	41.86 ± 2.50	29.81 ± 1.40	46
Area 21a	52.28 ± 5.12	35.47 ± 2.87	39.03 ± 3.76	23.52 ± 1.76	46
Coherence
Area 17/18	12.89 ± 2.64	7.99 ± 2.61	7.64 ± 2.71	2.54 ± 1.21	23
Area 21a	23.19 ± 4.09	29.71 ± 4.05	19.58 ± 2.35	13.42 ± 2.38	23
Coherence 17/18 and 21a	13.50 ± 3.31	5.15 ± 1.85	7.16 ± 1.69	−6.98 ± 2.24	23
Firing rates
Area 17/18	213.73 ± 29.48	256.88 ± 36.65	68.13 ± 12.96	84.17 ± 12.97	36
Area 21a	151.32 ± 17.96	130.90 ± 20.42	109.78 ± 16.95	58.79 ± 10.12	23

Averages are computed from all data involving a total of 92 different recording sites from both areas. The transient and sustained phases correspond to before and after 200 msec after stimulus onset, respectively. Bold type indicates significant differences between S+ and S− (p<0.05). Italic type indicates differences close to significance (p<0.06).