Table 1.

Nomenclature of the groups.

Notation	Definition
P	All events contained in the frame is positive.
N	All events contained in the frame is negative.
PN	All events contained in the frame is positive or negative.
Frequency	Encoded by the method of Frequency.
SAE	Encoded by the method of Surface of Active Events.
LIF	Encoded by the method of Leaky Integrate-and-Fire.
MTC	Encoded by the method of Merged-Three-Channels.