The 5s detected tones masked by gaussian noise under forced-choice and non-forced-choice psychophysical methods. The index of detectability, d', was calculated for each procedure under the assumption that failure to respond in non-forced-choice methods is equivalent to a middle-category response on a 3-point rating scale. This assumption was supported by independence of d 1 and the probability of an overt response, P(R), for a range of P(R) of .26-1.0. This result provides a modern answer to the classical question, "Is 'uncertain' a meaningful psychophysical response?" Certainly.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.