Sentence:  Some of the earliest recordings , made in the 1940 's , demonstrated that psychiatrists reacted immediately to anger and anxiety in the sound track , whereas written records of the same interview offered far fewer cues to therapy which - if they <WSD>were</WSD> at all discernible in print - were picked up only by the most skilled and sensitive experts . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)