Table 2

Comparison of small-world characteristics with AD network literature

Study

group

N

γ

λ

σ


Present study

Control group

21

1.67

1.11

1.50

EEG (Stam 2007)

Healthy controls

21

1.58

1.07

1.48

MEG (Stam 2004)

Healthy controls

126

4.20

1.80

2.30

fMRI (Supekar 2008)

Healthy controls

90

1.74

1.05

1.66

Present study

AD

21

1.61

1.08

1.49

EEG (Stam 2007)

AD

21

1.60

1.12

1.43

fMRI (Supekar 2008)

AD

90

1.56

1.04

1.50


Present study

FTLD

21

1.73

1.12

1.55


Comparison for unweighted network characteristics of the present study with earlier reported work. Although there are considerable methodological differences between these studies, all results indicate that network structure in both healthy persons and AD patients can be described as having small-world network characteristics (σ>1). N = number of nodes in the graph, γ = normalized clustering coefficient, λ = normalized characteristic path length, σ = small-worldness (γ/λ). In the EEG and MEG studies, values have been averaged over all frequency bands.

de Haan et al. BMC Neuroscience 2009 10:101   doi:10.1186/1471-2202-10-101

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