Biomedical Engineering Reference
In-Depth Information
(a)
(b)
coh
e
rence
pdc
:
3−−>1
pdc
:
1−−>3
1
1
0.5
0.5
0
0
0
0.2
0.4
0
0.2
0.4
0
0.2
0.4
causality:3−−>1
causality:1−−>3
dtf:3−−>1
dtf:1−−>3
1
0.2
0.5
0.1
0
0
0
0.2
0.4
0
0.2
0.4
0
0.2
0.4
0
0.2
0.4
frequency
frequency
frequency
frequency
Fig. 8.3
Results of computing bivariate measures between
s
1
(
t
)
and
s
3
(
t
)
in the first experiments.
a
Results of computing spectral causality measures and the coherence. Results for the coherence are
shown in the
top panel
. Results for the spectral Geweke causality are shown in the
bottom panels
.
b
Results of computing the partial directed coherence (PDC) (
top panels
) and the directed transfer
function (DTF) (
bottom panels
). Explanations on the ordinate and abscissa variables are found in
the caption for Fig.
8.2
(a)
(b)
1
2−−>1
1−−>2
2−−>1
1−−>2
0.5
0
1
3−−>1
1−−>3
3−−>1
1−−>3
0.5
0
1
3−−>2
2−−>3
3−−>2
2−−>3
0.5
0
0
0.2
0.4
0
0.2
0.4
0
0.2 0.4
frequency
0
0.2
0.4
frequency
frequency
frequency
Fig. 8.4 a
The plot of partial directed coherence (PDC) and
b
directed transfer function (DTF)
computed using the model MVAR coefficients in Eq. (
8.122
). Explanations on the ordinate and
abscissa variables are found in the caption for Fig.
8.2
source has a directional influence on the first source. The PDC and DTF computed
using the model MVAR coefficients which appear in Eq. (
8.122
)areshowninFig.
8.4
.
The results in Fig.
8.4
show the ground truth in the following experiments.
