A frequency domain technique for characterizing nonlinearities in biological systems*
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Steady state evoked potentials indicate changes in nonlinear neural mechanisms of vision in sight recovery individuals
2021, CortexCitation Excerpt :However, if the generating neural circuits comprise a nonlinear periodic system, the SSVEPs contain harmonic components which are integer multiples of the fundamental frequency. Nonlinear harmonic responses have, for example, been attributed to the asymmetry between luminance increment-sensitive (On) and luminance decrement-sensitive (Off) pathways in the visual system (Cohen et al., 2016; Kim et al., 2011; Regan & Regan, 1988). Furthermore, if two attributes of the current stimulus are modulated at two different frequencies (e.g., Fa, and Fb), and if the neural system nonlinearly integrates these two stimulus attributes, additional responses at intermodulation frequencies (e.g., Fa + Fb, Fa - Fb) arise (Regan & Regan, 1988).
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Parts of this research were supported by the Canadian NSERG and MRC and the NEI, and sponsored by the U.S. Air Force Office of Scientific Research.