Effectiveness of noisy excitation using irrational frequency components

Determine whether quasi-periodic noisy excitation produced by combining sinusoidal components with irrational frequency values is more effective for non-invasive deep-brain stimulation via spatio-temporal Fourier synthesis than deterministic harmonic configurations.

Background

Section 3.2.2 explores "Noisy excitations" in which some harmonics are assigned irrational frequencies, producing quasi-periodic noise-like stimulation patterns. Figure 1 illustrates such a configuration.

The authors explicitly note uncertainty regarding whether these noisy excitations provide improved stimulation efficacy, motivating comparative experimental studies.