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Fig. 10.9. (a) Average time-varying in-strength distributions fro the Beta band. The latency from
the movement onset is shown on the x-axes; the in-strength (
S
in
) values on the y-axes. The colour
encodes the group-averaged intensity of the
R
in
Z-score. (b) Average time-varying out-strength
distributions fro the Beta band. Same conventions as above.
preparation to the movement execution, as revealed by the respective shift of the
significant Z values towards high levels of out-strength.
The level of organization in the time-varying cortical networks during the foot
movement was analyzed by computing the efficiency indexes
E
g
and
E
l
. The
E
g
and
E
l
indexes estimated in every subject from the respective cortical networks
were contrasted with the ones obtained from the respective random structures.
Figure 10.10 shows the average Z-scores of the time-varying
E
g
(solid line) and
E
l
- (dotted line) of the connectivity patterns in the Beta frequency band. In
particular, one second before the onset (from about -1 to -0.5
s
), the cortical
networks mostly show low values of
E
g
and
E
l
,
reflecting a weak pattern of
communication characterized by long average distances and few clustering
connections between the ROIs. Throughout the period closer to the execution of
the movement (from about -0.5
s
to the onset), both the global and local
properties increase and in correspondence with it, we observe high values of
E
g
and
E
l
.
