Appendix 1—table 1. Visual classification system.

Classification relies upon visualization of the given features. In case of multiple features present, the bifurcation listed on top takes priority. DC shift: a sharp deflection >5 times the background that occurs in <0.5 s, then lasts >1 s. Constant: the value is consistent and does not trend upward or downward for 10 spikes. Arbitrary: no consistent unimodal trend over 10 spikes.

Onset
DC Shift	SN(+DC)
Amplitude increasing	SupH
Interspike interval (ISI) decreasing (i.e. frequency increasing)	SNIC
ISI and Amplitude constant/arbitrary (no DC shift)	SN(-DC) or SubH
Offset
DC Shift	SH(+DC)
Amplitude decreasing	SupH
ISI increasing (frequency decreasing) (no DC shift)	SH(-DC) or SNIC
ISI and amplitude constant/arbitrary (no DC shift)	FLC