. "an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; \"a double-blind procedure is used to guard against both experimenter bias and placebo effects\""@en-us . . "double-blind experiment"@en-us . "100178177"^^ . "100168212"@en-us . . . "double-blind procedure"^^ . . "double-blind procedure"@en-us . . . "00178177-n"^^ . . . "double-blind study"@en-us . . . "0"^^ . "0.125"^^ .