Sentence:  For the marksman , we study sets of five shots ( * * f ) ; for the mice , we restrict <WSD>attention</WSD> to litters of eight ( * * f ) ; and for the aces , we toss three dice ( * * f ) . 
Meaning of the word marked with <WSD> tags:  the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others