Table 2. Comparison of number of nodes in the graph (N), normalized characteristic path length (λ), normalized clustering coefficient (γ), and small-world measure (σ) from our study with previously published results on small-world characterization of functional brain network constructed using EEG, MEG, and fMRI data.

Data	N	λ	γ	σ
fMRI of healthy human subjects (Our study)	90	1.05	1.74	1.66
fMRI of human subjects with AD (Our study)	90	1.042	1.56	1.497
EEG of healthy human subjects (Stam 2006)	21	1.07	1.58	1.476
EEG of human subjects with AD (Stam 2006)	21	1.12	1.6	1.428
EEG of healthy human subjects (Micheloyannis 2006)	28	1.0	2.0	2.0
MEG of healthy human subjects (Stam 2004)	126	1.8	4.2	2.3
fMRI of healthy human subjects (Salvador 2005)	90	1.09	2.08	1.91
fMRI of healthy human subjects (Achard 2006)	90	1.09	2.37	2.18