development of the persian listening in spatialized noise sentence test: a preliminary study

Background and aim: listening in spatialized noise sentence (lisn-s) is one of the auditory processing disorder test battery that specifically diagnose spatial processing disorders. this research aimed to develop the persian version of the lisn-s, for assessing auditory processing disorders in the persian speakers’ population. methods: the plisn-s test was developed based on its original australian version. the speech stimuli were convolved with head-related transfer functions (hrtfs) to generate speech in the presence of spatialized noise. in total, 120 target sentences (consisting of five 1-3-syllable words) and competing stories were presented in four conditions. these included the same voice co-located condition (sv0°), different voice co-located condition (dv0°), same voice separated condition (sv±90°), and different voice separated condition (dv±90°). then, data from 30 adults aged 18–23 with normal hearing were obtained. results: the results from the normal-hearing subjects showed that the speech reception threshold (srt) scores, expressed as signal to noise ratios (snr), varied across the four conditions (sv0°, dv0° sv±90°, dv±90°) the highest and lowest srts belonged to the first and last conditions, respectively. the amount of advantage in all conditions was lower than in the previously published english versions. conclusion: considering the impact of spatial separation on the srts, plisn-s appears to be an effective tool for measuring spatial processing skills.