<s>
Event-related	B-Algorithm
optical	I-Algorithm
signal	I-Algorithm
(	O
EROS	O
)	O
is	O
a	O
neuroimaging	B-Algorithm
technique	O
that	O
uses	O
infrared	O
light	O
through	O
optical	B-Architecture
fibers	I-Architecture
to	O
measure	O
changes	O
in	O
optical	O
properties	O
of	O
active	O
areas	O
of	O
the	O
cerebral	O
cortex	O
.	O
</s>
<s>
Whereas	O
techniques	O
such	O
as	O
diffuse	B-Algorithm
optical	I-Algorithm
imaging	I-Algorithm
(	O
DOI	O
)	O
and	O
near-infrared	O
spectroscopy	O
(	O
NIRS	O
)	O
measure	O
optical	O
absorption	O
of	O
hemoglobin	O
,	O
and	O
thus	O
are	O
based	O
on	O
cerebral	O
blood	O
flow	O
,	O
EROS	O
takes	O
advantage	O
of	O
the	O
scattering	O
properties	O
of	O
the	O
neurons	O
themselves	O
,	O
and	O
thus	O
provide	O
a	O
much	O
more	O
direct	O
measure	O
of	O
cellular	O
activity	O
.	O
</s>
<s>
Currently	O
,	O
its	O
biggest	O
limitation	O
is	O
the	O
inability	O
to	O
detect	O
activity	O
more	O
than	O
a	O
few	O
centimeters	O
deep	O
,	O
which	O
thus	O
limits	O
this	O
fast	O
optical	B-Algorithm
imaging	I-Algorithm
to	O
the	O
cerebral	O
cortex	O
.	O
</s>
<s>
EROS	O
can	O
also	O
be	O
measured	O
concurrently	O
with	O
other	O
neuroimaging	B-Algorithm
techniques	O
,	O
such	O
as	O
fMRI	O
,	O
fNIRS	O
,	O
or	O
EEG	O
.	O
</s>
<s>
It	O
was	O
developed	O
at	O
the	O
University	O
of	O
Illinois	O
at	O
Urbana	O
–	O
Champaign	O
in	O
the	O
Cognitive	O
Neuroimaging	B-Algorithm
Laboratory	O
of	O
Drs	O
.	O
</s>
