Effects of listener age and native language on perception of accented and unaccented sentences

Abstract

Degradations to auditory input have deleterious effects on speech recognition performance, especially by older listeners. Alterations to timing information in speech, such as occurs in rapid or foreign-accented speech, can be particularly difficult for older people to resolve. It is currently unclear how prior language experience modulates performance with temporally altered sentence-length speech utterances. The principal hypothesis is that prior experience with a foreign language affords an advantage for recognition of accented English when the talker and listener share the same native language, which may minimize age-related differences in performance with temporally altered speech. A secondary hypothesis is that native language experience with a syllable-timed language (Spanish) is advantageous for recognizing rapid English speech. Native speakers of English and Spanish completed speech recognition tasks with both accented and unaccented English sentences presented in various degrees of time compression (TC). Native English listeners showed higher or equivalent recognition of accented and unaccented English speech compared to native Spanish listeners in all TC conditions. Additionally, significant effects of aging were seen for native Spanish listeners on all tasks. Overall, the results did not support the hypotheses for a benefit of shared language experience for non-native speakers of English, particularly older native Spanish listeners.

Figures

FIG. 1.

Mean audiograms (with standard errors) of the four listener groups. Filled symbols represent L2 listeners and open symbols represent L1 listeners. YNH = younger participants with normal hearing; ONH = older participants with normal hearing.

FIG. 2.

Mean speech recognition scores for the sentence-final LP-SPIN words in four TC conditions, spoken by the unaccented (left) and Spanish-accented (right) talkers. Scores for all four listener groups are presented with error bars representing one standard error. Filled symbols represent L2 listeners and open symbols represent L1 listeners. YNH = younger participants with normal hearing; ONH = older participants with normal hearing.