<s>
4CAPS	B-Language
(	O
Cortical	B-Language
Capacity-Constrained	I-Language
Concurrent	I-Language
Activation-based	I-Language
Production	I-Language
System	I-Language
)	O
is	O
a	O
cognitive	B-Architecture
architecture	I-Architecture
developed	O
by	O
Marcel	O
A	O
.	O
</s>
<s>
It	O
is	O
the	O
successor	O
of	O
the	O
CAPS	O
and	O
3CAPS	O
cognitive	B-Architecture
architectures	I-Architecture
.	O
</s>
<s>
In	O
4CAPS	B-Language
computations	O
are	O
distributed	O
and	O
dynamically	O
balanced	O
among	O
independent	O
processing	O
centers	O
.	O
</s>
<s>
Like	O
in	O
other	O
cognitive	B-Architecture
architectures	I-Architecture
(	O
e.g.	O
,	O
ACT-R	B-Language
)	O
,	O
these	O
processing	O
centers	O
have	O
been	O
identified	O
with	O
corresponding	O
cortical	O
regions	O
in	O
the	O
human	O
brain	O
.	O
</s>
<s>
Notably	O
,	O
4CAPS	B-Language
differs	O
from	O
other	O
architectures	O
for	O
its	O
stress	O
on	O
the	O
capacity	O
constraints	O
(	O
that	O
is	O
,	O
limited	O
computational	O
power	O
)	O
,	O
and	O
the	O
dynamic	O
collaboration	O
between	O
different	O
centers	O
.	O
</s>
<s>
In	O
particular	O
,	O
according	O
to	O
Just	O
and	O
Varma	O
,	O
4CAPS	B-Language
is	O
based	O
on	O
four	O
characteristic	O
assumptions	O
:	O
</s>
<s>
Like	O
other	O
cognitive	B-Architecture
architectures	I-Architecture
(	O
such	O
as	O
ACT-R	B-Language
,	O
EPIC	O
,	O
and	O
Soar	B-Architecture
)	O
,	O
4CAPS	B-Language
is	O
implemented	O
as	O
a	O
production	B-Application
system	I-Application
.	O
</s>
<s>
It	O
is	O
written	O
in	O
the	O
Common	B-Language
Lisp	I-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
In	O
particular	O
,	O
4CAPS	B-Language
models	O
have	O
been	O
created	O
and	O
used	O
to	O
fit	O
behavioral	O
and	O
imaging	O
data	O
for	O
tasks	O
such	O
as	O
the	O
Tower	O
of	O
London	O
,	O
mental	O
rotation	O
,	O
and	O
dual-tasking	O
.	O
</s>
