A) The location of the cochlear implant’s external magnet
interferes with headset placement over the temporal area. B) The fNIRS headset
is simply apposed over the magnet (shaded area). C) Custom analytic software
demonstrating the quality of scalp contact for each optode using live fNIRS
recordings. The optodes obstructed by the magnet postero-superiorly lose their
scalp contact (red), while the remaining optodes are unaffected and can still be
used (green). The status of scalp contact remained indeterminate for certain
optodes (yellow). Figure adapted from (Saliba, Bortfeld, Levitin, & Oghalai,
2016).