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The locations of the fNIRS probes in relation to landmarks in the 10–20 system. Sources are marked with red circles; detectors are marked with blue circles. Data channels are defined as a connection between a source and a detector. Channels are referred to by their position in the 10–20 system (see white ovals) and a channel number (1, 2, or 3 moving from front to back). For instance, F5-1 is the yellow channel near F5, F5-2 is the purple channel, and F5-3 is the green channel.
