In what unit is a neuron's firing measured, and is a spike train a wave? · Lobeworks/17

In hertz, spikes per second: 100 spikes per second is 100 Hz.

In what unit is a neuron's firing measured, and is a spike train a wave?

In hertz, spikes per second: 100 spikes per second is 100 Hz. A spike train is a series of discrete events, never a continuous wave, so 200 Hz means two hundred separate action potentials in a second, on average, all of the same size. What carries the strength of the input is how often they come, which is the rate code Adrian and Zotterman described in 1926.