<s>
The	O
C1	B-Algorithm
and	I-Algorithm
P1	I-Algorithm
(	O
also	O
called	O
the	O
P100	O
)	O
are	O
two	O
human	O
scalp-recorded	O
event-related	O
brain	O
potential	O
(	O
event-related	B-Algorithm
potential	I-Algorithm
(	O
ERP	O
)	O
)	O
components	O
,	O
collected	O
by	O
means	O
of	O
a	O
technique	O
called	O
electroencephalography	B-Application
(	O
EEG	B-Application
)	O
.	O
</s>
<s>
Both	O
components	O
are	O
related	O
to	O
processing	O
of	O
visual	O
stimuli	O
and	O
are	O
under	O
the	O
category	O
of	O
potentials	O
called	O
visually	B-Algorithm
evoked	I-Algorithm
potentials	I-Algorithm
(	O
VEPs	O
)	O
.	O
</s>
<s>
This	O
was	O
one	O
of	O
the	O
first	O
papers	O
to	O
show	O
that	O
attention	O
could	O
modulate	O
a	O
visually	B-Algorithm
evoked	I-Algorithm
potential	I-Algorithm
as	O
early	O
on	O
as	O
the	O
P1	O
.	O
</s>
<s>
This	O
is	O
as	O
compared	O
to	O
another	O
component	O
called	O
the	O
N1	B-Algorithm
.	O
</s>
<s>
The	O
N1	B-Algorithm
shows	O
an	O
increment	O
in	O
amplitude	O
when	O
a	O
participant	O
is	O
attending	O
to	O
a	O
certain	O
area	O
and	O
the	O
stimulus	O
is	O
shown	O
in	O
that	O
area	O
.	O
</s>
<s>
One	O
of	O
the	O
critical	O
debates	O
that	O
the	O
C1	B-Algorithm
and	I-Algorithm
P1	I-Algorithm
have	O
helped	O
to	O
contribute	O
to	O
is	O
that	O
of	O
early	O
versus	O
late	O
selection	O
models	O
.	O
</s>
<s>
Further	O
evidence	O
that	O
the	O
P1	O
is	O
located	O
along	O
the	O
ventral	O
pathway	O
comes	O
from	O
a	O
studies	O
using	O
both	O
ERPs	O
and	O
positron	B-Application
emission	I-Application
tomography	I-Application
.	O
</s>
