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