Masking Release for Igbo and English

Area of Science:

• Speech Perception
• Psychoacoustics
• Linguistics

Background:

• Masking Release, the improvement in speech intelligibility due to noise interruption, is well-documented for English but understudied for tonal languages like Igbo.
• Understanding Masking Release in Igbo is crucial for assessing speech intelligibility in diverse linguistic populations and noisy environments.

Purpose of the Study:

• To investigate the phenomenon of Masking Release in Igbo, comparing native Igbo speakers' performance in Igbo and English, and native English speakers' performance in English.
• To compare Masking Release patterns between native speakers of a tonal language (Igbo) and a non-tonal language (English).

Main Methods:

• Utilized the Hearing In Noise Test (HINT) with English and Igbo stimuli to measure the signal-to-noise ratio (SNR) for 50% speech intelligibility.
• Compared results across three groups: native English speakers (English HINT), native Igbo speakers (English HINT), and native Igbo speakers (Igbo HINT).

Main Results:

• Native English speakers showed orderly and consistent HINT results, aligning with established data.
• Igbo speakers exhibited greater variability in English HINT, likely due to English proficiency differences, with lower masking release values than native English speakers.
• Igbo speakers demonstrated lower SNRs for Igbo sentences compared to English sentences, indicating better intelligibility in their native tonal language, potentially aided by tonal and vowel harmony features.

Conclusions:

• Native language processing in noise is superior to second language processing, consistent with familiarity and predictive linguistic features.
• Igbo's tonal and vowel harmony features may contribute to enhanced Masking Release and speech intelligibility in native speakers.
• This research highlights language-specific factors influencing speech perception in noise, particularly the role of tonal properties in African languages.