Table 1.

Parameters included each model

Model	Description	${\mathit{\tau }}_{\mathit{d}}$	${\mathit{\tau }}_{\mathit{f}}$	$\mathit{f}$	$\mathit{U}$	Reset
1	Integration only	0	0	1	1	Yes
2	Facilitation only	0	No constraints			Yes
3	Depression only	No constraints	0	No constraints		Yes
4	3-parameter TM	No constraints		$f=U$		Yes
5	TM without reset	No constraints				No
6	Full model	No constraints				Yes

Note that ${\mathit{\tau }}_{\mathit{s}}$ is not constrained in any of the six models.