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