Table 1

Triggered and prevented events

	Time of peak	+1 Hz	+5 Hz	–1 Hz	–5 Hz
Percentage of prevented events	t = 1500 ms	0.1806	0.1944	0.1528	0.1389
	t = 1850 ms	0.1389	0.1944	0.0972	0.1528
	t = 1950 ms	0.1528	0.2361	0.125	0.0694
	t = 1975 ms	0.0972	0.0	0.3472*	0.3889*
	t = 2000 ms	0.0139	0.0	0.25*	0.5556**
	t = 2500 ms	0.0	0.0	0.0	0.0972

Percentage of triggered propagation events	t = 1500 ms	0.25*	0.1786	0.2857*	0.25*
	t = 1850 ms	0.178	0.1786	0.2143	0.2143
	t = 1950 ms	0.0357	0.6071**	0.2143	0.5**
	t = 1975 ms	0.7143**	1.0**	0.25*	0.28572*
	t = 200 ms	0.6071**	1.0**	0.0	0.0714
	t = 2500 ms	0.0	0.0	0.0	0.0

The percentage of prevented events refers to 72 initially propagative behaviors. *, ≥25%; **, ≥50%. The time of peak corresponds to the moment where the maximum of the stimulus is reached, and the amplitude corresponds to a variation of the external input (see the main text). The percentage of triggered propagation events refers to an initial number of 38 non-propagative cases. *, ≥25%; **, ≥50%.