Neural recordings could be detected on each recording site in {HEAD ~ sequence} as {TAIL ~ the electrodes} were lowered into the brain 
as
Neural recordings could be detected on each recording site in { HEAD ~ sequence } as { TAIL ~ the electrodes } were lowered into the brain
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH