The experiment was designed to investigate the effects of (1) knowledge of test vocabulary and (2) practice in responding to spondee words at threshold intensities on the spondee threshold in normal-hearing subjects. Results of this experiment were: (1) practice in responding to spondee words at threshold intensities does not influence the spondee threshold in normal-hearing subjects, and (2) normal-hearing subjects given prior knowledge of the test vocabulary yield spondee thresholds 4 to 5 db lower than those yielded by subjects not given such knowledge.
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Tillman et al. (1959) studied this question.
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