Validation of the Iowa test of consonant perception

Abstract

Speech perception, especially in background noise, is a critical problem for hearing impaired listeners, and an important issue for cognitive hearing science. Despite a plethora of standardized measures, there are few single-word, closed tasks that uniformly sample the phonetic space and which use response choices that balance all of the phonetic features. The Iowa Test of Consonant Perception (ITCP) was developed to solve this. It is a phonemically balanced word recognition task designed to assess perception of the initial consonant of monosyllabic consonant-vowel-consonant (CVC) words. The ITCP consists of 120 phonetically balanced CVC words. Words were recorded from four different talkers (two female), and uniformly sample from all four corners of the vowel space to control for coarticulation. Response choices on each trial are balanced to equate difficulty and sample single phonetic feature. This study evaluated the psychometric properties of ITCP by examining reliability (test-retest) and validity in a sample of online normal hearing participants. Ninety-eight participants completed two sessions of the ITCC along with standardized tests of words and sentence in noise (CNC words and AzBio sentences). The ITCP showed good test test-retest reliability and convergent validity with thee two popular speech-in-noise.