Short-separation channel

Definition: A short separation channel is generated by placing a source and a detector at a short distance, in case of the adult brain, this is typically ~ 1 cm or less, in contrast to regular long-separation channels with ~3 cm source-detector distances. At such distances, channels are mostly sensitive to systemic activity resulting from extracerebral tissues (i.e., scalp and skull). The signal from these channels can be used to regress out extra-cerebral contaminations from the long-separation fNIRS signal in order to isolate the cortical functional response. Definition: A short separation channel is generated by placing a source and a detector at a short distance, in case of the adult brain, this is typically ~ 1 cm or less, in contrast to regular long-separation channels with ~3 cm source-detector distances. At such distances, channels are mostly sensitive to systemic activity resulting from extracerebral tissues (i.e., scalp and skull). The signal from these channels can be used to regress out extra-cerebral contaminations from the long-separation fNIRS signal in order to isolate the cortical functional response.

Alternative definition:

Synonym: short-distance channel, short channel

References: e.g. https://doi.org/10.1016/j.neuroimage.2013.04.070

Related terms: Extra-cerebral signal, Short-separation distance, Short-separation regression, Short-channel regression, Source-detector separation distance

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