{HEAD ~ The global quality} of the perceived image is superior to {TAIL ~ the sum} of the two since the brain possesses some capacity to concentrate its interpretation of the image on the one which is clearer 
is superior to
{ HEAD ~ The global quality } of the perceived image is superior to { TAIL ~ the sum } of the two since the brain possesses some capacity to concentrate its interpretation of the image on the one which is clearer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH