Frequency Range

Definition: Frequency range refers to an interval defined by lower and upper frequency values. A system, whether biological or electronic, either produces or responds to signals, which generally consist of a great number of components with different frequencies. Therefore, the term also refers to the set of signals that are significant for a system or that a system can detect and generate a non-negligible, consistent response against (e.g., human ear can detect sounds within a window of 20 Hz – 20 kHz) or that can be consistently produced by a system (e.g., oscillators). fNIRS can measure several frequency ranges of physiological interest, such as heart rate, respiration, low-frequency oscillations (typically associated with functional connectivity), and the hemodynamic response related with the neural activity.Definition: Frequency range refers to an interval defined by lower and upper frequency values. A system, whether biological or electronic, either produces or responds to signals, which generally consist of a great number of components with different frequencies. Therefore, the term also refers to the set of signals that are significant for a system or that a system can detect and generate a non-negligible, consistent response against (e.g., human ear can detect sounds within a window of 20 Hz – 20 kHz) or that can be consistently produced by a system (e.g., oscillators). fNIRS can measure several frequency ranges of physiological interest, such as heart rate, respiration, low-frequency oscillations (typically associated with functional connectivity), and the hemodynamic response related with the neural activity.

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