Sentence:  Nakamura ( ' 58 ) , Verloop ( ' 48 ) , Marchand , Gilroy and Watson ( ' 50 ) , von Hayek ( ' 53 ) , and Tobin ( ' 52 ) have all <WSD>claimed</WSD> their normal but relatively nonfunctional existence in the human being . 
Meaning of the word marked with <WSD> tags:  assert or affirm strongly; state to be true or existing