Table 1.

Similarity between patterns of enhanced coherence

		Verbal		Visual
		p	r	p	r
		1
		0	1
δ		0	0	1
		0	0	0	1
		1
		0	1
θ		0	0	1
		0	0.35	0	1
		1
		0	1
α2		0.31	0	1
		0	0.22	0.27	1
		1
		0	1
α1		0	0.11	1
		0	0.21	0.60	1
		1
		0	1
β		0.27	0.12	1
		0.40	0	0.14	1
		1
		0.54	1
γ		0.60	0.42	1
		0.41	0.42	0.52	1

The table compares the EEG coherence patterns of the two task conditions (visual and verbal) in each frequency band for both perception (p) and retention (r). The similarity S between two patterns is quantified as the ratio of equal connections with respect to the total number of connections in both maps. For example, Fig. 3 A and B share eight connections (Fr-T5; Fp2-T5; Fz-T5; Fp1-T5). Dividing by 23, the total number of connections, gives S = 0.35. In θ, the patterns during retention were highly similar but different from all other conditions; in γ, all patterns showed a high degree of similarity. (In the diagonals, patterns are compared to themselves, leading to a similarity of S = 1.)