Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Experimental setup. (a) Schematic representation of the piezoelectric stimulator, the plastic base and the plastic contactor. The numbers indicating length, width and height are expressed in millimeters. (b) Voltage waveform applied to the piezoelectric stimulator in each trial, showing the 250 Hz sinusoidal burst (not in scale) within the 1 s presentation interval.
