psychometric function characteristics of time-compressed persian words

Background and aim: the psychometric function characteristics (e.g. threshold and slope) of the time-compressed words have not been investigated in previous studies to compile psychometrically homogeneous word lists. therefore, this study aimed to investigate psychometric function characteristics of monosyllabic time-compressed persian words to develop psychometrically equivalent time-compressed word lists. methods: two hundred most common monosyllabic words in persian language were time-compressed at a rate of 40%-85% and presented to 21 participants with normal hearing at a fixed intensity level. the threshold and slope of the psychometric function for all words were determined using the logistic regression. the compression ratio (cr) for 5%-95% correct recognition was predicted based on the psychometric function fitted to the measured correct recognition score. results: mean cr 50% of the words was in a range of 53%-78%. the mean cr 50% and slope were not significantly different between consonant-vowel-consonant and consonantvowel-consonant-consonant words. the predicted cr for 5%-95% correct recognition varied from 61.5% to 88.4%. the final result was two 50-word lists of monosyllabic words with the same mean threshold and slope. conclusion: persian time-compressed monosyllabic words have different cr 50% and slope that may interact with their intelligibility.