Extended Data Fig. 1: Spectral analysis of measured displacement demonstrates that vibrations were pure sinusoids.
From: Feature-selective encoding of substrate vibrations in the forelimb somatosensory cortex
a, Example of a displacement measured by the stimulator’s strain gauge (black) of a single 590-Hz vibration. The bottom trace shows an expansion in time of the interval highlighted in red. b, Amplitude spectrum of the displacement produced by the 590-Hz stimulus indicates that the physical vibration consisted of a single frequency component (that is, was a pure sinusoid). Components apparent at higher frequencies were highly attenuated relative to the stimulation frequency and were for the most part continuously present, as revealed by the signal spectrum of the pre-stimulus baseline period (blue). c, Analogous amplitude spectra were obtained for stimuli at all tested frequencies and amplitudes.
