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Fig. 10.4. (Up) Average cortical networks in the Beta band for the SCI group and CTRL group.
(Centre ) Location of the ROIs on the realistic cortex model of a representative subject. (Bottom)
The SCI group attempted the foot movement, while the CTRL group executed it.
In order to study the preparation to an intended foot movement, a time
segment of 1.5 seconds before the lips pursing was analyzed. The lips movement
was detected by means of an EMG. The task was repeated every 6-7 seconds, in
a self-paced manner, and the 100 single trials recorded will be used for the
estimate of functional connectivity by means of the Directed Transfer Function
(DTF, see paragraph X.2) in four frequency bands (Theta 4-7 Hz, Alpha 8-12
Hz, Beta 13-29 Hz, 30-40 Hz). Only the connections that were statistically
significant (at p < 0.001) after a contrast with a surrogate distribution of one
thousand DTF values among the same ROIs were considered for the network to
be analyzed with graph theory's tools. Figure 10.4 shows the average cortical
network estimated in the Beta frequency band for the SCI group and for the
CTRL group, during the motor attempt/execution of the task. The twelve ROIs
(the nodes of the cortical network) are indicated on the cortex of one
representative subject.
The upper panels of Fig. 10.5 show the average in- and out-degree in the SCI
population a) and in the CTRL group b) for the significant Beta band. Direct
comparisons of the data show that in the SCI patients the number of links
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