Biomedical Engineering Reference
In-Depth Information
(a)
(b)
Region A
A
nteri
or
Lateral
-180
-90
0
90
180
Phase (deg.)
(c)
200
150
100
50
30
-150
-100
-50
0
50
100
150
Time (ms)
Fig. 9.3
Results of local PAC (lPAC) analysis.
a
Location of Region A where a significant type I
lPAC activity was observed. The lPAC activity at Region A was analyzed.
b
Amplitude-phase
diagram. Each
bar
indicates the mean amplitude value at that phase bin. The
error bar
indicates
the
±
standard deviation. In this analysis, the LF signal was set to 12
.
5
±
0
.
5 Hz, and the HF signal
was set to 75
5 s was analyzed.
c
The
phase-informed TF map. The amplitude of the HF signal is
color-coded
and displayed according to
the
color bar
. The sinusoidal plot shows cos
±
25 Hz. The data in the time window from
−
4
.
5to
−
2
.
(ʸ
L
(
t
))
where
ʸ
L
(
t
)
is the instantaneous phase of the
LF signal. Only the portion between
±
150 ms from the LF peaks in the time window is displayed
amplitude value
ʨ
j
significantly deviates from the uniform distribution, indicating that a strong lPAC
activity occurs. The preferred phase of the HF signal can be observed. That is, the
amplitude of the HF signal increases significantly at a specific phase of the LF signal
around
ʨ
j
at that phase bin. It can be seen that the distribution of
150
◦
, and decreases around
60
◦
.
−
+
