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  • Title: The temporal relationship between speech auditory brainstem responses and the acoustic pattern of the phoneme /ba/ in normal-hearing adults.
    Author: Akhoun I, Gallégo S, Moulin A, Ménard M, Veuillet E, Berger-Vachon C, Collet L, Thai-Van H.
    Journal: Clin Neurophysiol; 2008 Apr; 119(4):922-33. PubMed ID: 18291717.
    Abstract:
    OBJECTIVE: To investigate the temporal relationship between speech auditory brainstem responses and acoustic pattern of the phoneme /ba/. METHODS: Speech elicited auditory brainstem responses (Speech ABR) to /ba/ were recorded in 23 normal-hearing subjects. Effect of stimulus intensity was assessed on Speech ABR components latencies in 11 subjects. The effect of different transducers on electromagnetic leakage was also measured. RESULTS: Speech ABR showed a reproducible onset response (OR) 6ms after stimulus onset. The frequency following response (FFR) waveform mimicked the 500Hz low pass filtered temporal waveform of phoneme /ba/ with a latency shift of 14.6ms. In addition, the OR and FFR latencies decreased with increasing stimulus intensity, with a greater rate for FFR (-1.4ms/10dB) than for OR (-0.6ms/10dB). CONCLUSIONS: A close relationship was found between the pattern of the acoustic stimulus and the FFR temporal structure. Furthermore, differences in latency behaviour suggest different generation mechanisms for FFR and OR. SIGNIFICANCE: The results provided further insight into the temporal encoding of basic speech stimulus at the brainstem level in humans.
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