The displacement values may be employed to produce {TAIL ~ a signal} indicative of a respiration phase that can be used in connection with {HEAD ~ motion artifact reduction techniques} 
The displacement values may be employed to produce { TAIL ~ a signal } indicative of a respiration phase that can be used in connection with { HEAD ~ motion artifact reduction techniques }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD