![]() ![]() Infants with hearing loss may be significantly delayed in developing perceptual abilities to distinguish between phonemes, even in their native language ( Eisenberg et al., 2007 Moeller et al., 2007), ultimately leading to significant receptive and expressive oral language delays ( Tomblin et al., 2015). Many infants who could not reach performance criteria for VRISD had ACC amplitude ratios ≥ 2.0. VRISD tests of vowel-contrast detection had a 71% hit and a 21% false-positive rate. For an amplitude ratio criterion of ≥ 1.5, the sensitivity was 93% for ACC component P2-N2 at 2/s, whereas at 1/s sensitivity was 70%. The ACC amplitude ratio’s sensitivity for detecting a vowel contrast was greater for the 2/s rate than the 1/s rate. ![]() Latency effects of vowel contrast and rate were present, but not systematic. Significant differences in the ACC presence and amplitude were observed as a function of rate, with 2/s resulting in ACCs with the largest amplitude ratios. The contrasts with /a/ as the leading vowel of the contrast pair resulted in the largest ACC amplitudes than other conditions. However, the hypothesis that the direction of vowel (spectral) change would result in significantly larger change responses for high-to-low spectral changes was not supported. Variations in ACC amplitude and latency occurred as a function of the initial vowel token and the contrast token. ![]()
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