<s>
A	O
pacemaker	B-Algorithm
action	I-Algorithm
potential	I-Algorithm
is	O
the	O
kind	O
of	O
action	B-Algorithm
potential	I-Algorithm
that	O
provides	O
a	O
reference	O
rhythm	O
for	O
the	O
network	O
.	O
</s>
<s>
This	O
contrasts	O
with	O
pacemaker	B-Algorithm
potential	I-Algorithm
or	O
current	O
which	O
drives	O
rhythmic	O
modulation	O
of	O
firing	O
rate	O
.	O
</s>
