{HEAD ~ Another way} of querying the observer is to employ {TAIL ~ the psychophysical methods} outlined in previous sections 
{ HEAD ~ Another way } of querying the observer is to employ { TAIL ~ the psychophysical methods } outlined in previous sections
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH