64-6 Medical, Biomedical, and Health
Inthe waveform itself, it is possible to see interictal seizure spikes or a full seizure (such as petit mal and
gr
and
ma
l
ep
ilepsy)
[1
8]
. An
alysis
of th
e
fr
equency
sp
ectrum
of th
e
EEG ca
n
rev
eal
ch
anges
in th
e
si
gnal
po
wer
at di
erent
fr
equencies
be
ing
pr
oduced
du
ring
va
rious
st
ages
of sl
eep,
as a re
sult
of an
esthetic
e
ects
an
d
so
metimes
as a re
sult
of br
ain
in
jury
[1
7]
.
Pr
actical
pr
oblems
an
d
ch
allenges
as
sociated
wi
th
EE
G
sig
nal
re
cordings
ar
ise
fr
om
ph
ysiological,
en
vironmental,
an
d
el
ectronic
no
ise
so
urces
. Ph
ysiological
so
urces
of in
terference
ar
e
mo
tion
ar
tifact,
mu
scle
no
ise,
ey
e
mo
tion
or bl
ink
ar
tifact,
an
d
so
metimes
ev
en
he
artbeat
sig
nals
. El
ectrical
in
terference
arises from the usual sources: ...