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The neurofeedback (NF) protocol used for the 8-puzzle experiment. Note that the last 10s of a resting epoch are used to determine the prefrontal cortex (PFC) asymmetry baseline a priori to the NF epoch. The 7-s delay is introduced to take into account the onset of haemodynamic response in fNIRS. The NF epoch is followed by a non-motivational cognitive task facilitating the return to a new baseline [71].
