Biomedical Engineering Reference
In-Depth Information
10
a)
0
−10
0
1
2
3
4
5
6
7
4
2
b)
0
−2
−4
0
1
2
3
4
5
6
7
20
15
c)
10
5
0
1
2
3
4
5
6
7
4
3
d)
2
1
0
1
2
3
4
5
6
7
2.5
e)
2
1.5
1
0
1
2
3
4
5
6
7
50
ERS
f)
0
ERD
−50
0
1
2
3
4
5
6
7
Time [s]
FIGURE 4.19:
Illustration of the classical ERD/ERS estimation for the beta band.
a) One of the
N
EEG epochs; b) the above signal filtered in the 15- 25 Hz band; c)
instantaneous power of the filtered signal; d) instantaneous power averaged over
N
epochs; e) smoothed version of the signal in (d), the reference time marked by two
vertical lines; f) ERD/ERS time course—average instantaneous power relative to the
mean value in the reference time.
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