<s>
Evoked	B-Algorithm
fields	I-Algorithm
are	O
part	O
of	O
the	O
magnetoencephalogram	B-Algorithm
.	O
</s>
<s>
They	O
are	O
brain	O
signals	O
evoked	O
by	O
sensory	O
stimulation	O
,	O
but	O
usually	O
buried	O
by	O
the	O
ongoing	B-Algorithm
brain	I-Algorithm
activity	I-Algorithm
.	O
</s>
<s>
Repeating	O
the	O
stimulus	O
multiple	O
times	O
and	O
averaging	O
the	O
signals	O
reduces	O
the	O
uncorrelated	O
ongoing	B-Algorithm
activity	I-Algorithm
and	O
reveals	O
the	O
evoked	B-Algorithm
field	I-Algorithm
.	O
</s>
<s>
Evoked	B-Algorithm
fields	I-Algorithm
are	O
the	O
magnetoencephalographic	B-Algorithm
equivalent	O
to	O
evoked	B-Algorithm
potentials	I-Algorithm
,	O
which	O
are	O
part	O
of	O
the	O
electroencephalogram	B-Application
.	O
</s>
<s>
An	O
auditory	O
evoked	B-Algorithm
field	I-Algorithm
(	O
AEF	O
)	O
is	O
a	O
form	O
neural	O
activity	O
that	O
is	O
induced	O
by	O
an	O
auditory	O
stimulus	O
and	O
recorded	O
via	O
magnetoencephalography	B-Algorithm
,	O
which	O
is	O
an	O
equivalent	O
of	O
auditory	O
evoked	B-Algorithm
potential	I-Algorithm
(	O
AEP	O
)	O
recorded	O
by	O
electroencephalography	B-Application
.	O
</s>
<s>
The	O
main	O
source	O
of	O
the	O
auditory	O
evoked	B-Algorithm
field	I-Algorithm
is	O
the	O
auditory	O
cortex	O
and	O
the	O
association	O
cortices	O
.	O
</s>
<s>
The	O
earliest	O
cortical	O
components	O
of	O
AEF	O
is	O
equivalent	O
to	O
the	O
middle	O
latency	O
response	O
(	O
MLR	O
)	O
of	O
the	O
EEG	B-Application
evoked	B-Algorithm
potential	I-Algorithm
,	O
called	O
the	O
middle	O
latency	O
auditory	O
evoked	B-Algorithm
field	I-Algorithm
(	O
MLAEF	O
)	O
,	O
which	O
occurs	O
at	O
30	O
to	O
50	O
ms	O
after	O
the	O
stimulus	O
onset	O
.	O
</s>
<s>
At	O
100	O
ms	O
after	O
stimulus	O
onset	O
occurs	O
the	O
most	O
prominent	O
response	O
in	O
the	O
late	O
latency	O
range	O
,	O
the	O
M100	B-Algorithm
,	O
which	O
corresponds	O
to	O
the	O
N1	B-Algorithm
peak	O
of	O
the	O
auditory	O
long	O
latency	O
response	O
(	O
ALR	O
)	O
potential	O
.	O
</s>
<s>
M100	B-Algorithm
is	O
the	O
most	O
widely	O
used	O
magnetic	O
field	O
response	O
clinically	O
.	O
</s>
<s>
demonstrated	O
that	O
M100	B-Algorithm
can	O
be	O
applied	O
to	O
estimate	O
hearing	O
threshold	O
to	O
a	O
higher	O
degree	O
of	O
accuracy	O
.	O
</s>
<s>
Longer	O
latency	O
responses	O
after	O
100	O
ms	O
are	O
referred	O
as	O
event-related	B-Algorithm
field	I-Algorithm
(	O
ERF	O
)	O
that	O
includes	O
M150	O
,	O
M200	O
,	O
M300	O
(	O
equivalent	O
of	O
P300	B-Algorithm
)	O
,	O
and	O
M400	O
.	O
</s>
