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