Does the researcher recognise that experimental results may not generalise because of the inherent lack of spontaneity in an experiment?

Does the researcher recognise that subjects and researchers can communicate with one another through intimation and vocalisation? The willingness of researchers like Libet, Weber, Fechner and Stevens to base their conclusions on the introspected responses of their chosen human subjects will have had consequences in other areas of their lives, in addition to the predictable consequence of failure to stand the test of time.

Does the researcher recognise that although he or she has stated that assessors were masked, or that a trial was ‘double-blind’, proof is necessary?