Definition: Signal cross-talk in fNIRS occurs when measured signals from one channel are contaminated by signals from neighboring channels due to light scattering in the measured tissue. This interference can introduce errors and distortions in fNIRS measurements, making it challenging to accurately localize brain activity. If the wavelength dependence of the differential path-length factor is not properly established, changes in oxyhemoglobin can mirror changes in deoxyhemoglobin. This phenomenon is also known as cross-talk, and it is caused by a spectral distortion.Definition: Signal cross-talk in fNIRS occurs when measured signals from one channel are contaminated by signals from neighboring channels due to light scattering in the measured tissue. This interference can introduce errors and distortions in fNIRS measurements, making it challenging to accurately localize brain activity. If the wavelength dependence of the differential path-length factor is not properly established, changes in oxyhemoglobin can mirror changes in deoxyhemoglobin. This phenomenon is also known as cross-talk, and it is caused by a spectral distortion.
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References: https://doi.org/10.1016/j.mri.2005.12.034
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