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Clin Neurophysiol. 2008 Apr;119(4):922-33. doi: 10.1016/j.clinph.2007.12.010. Epub 2008 Mar 4.

The temporal relationship between speech auditory brainstem responses and the acoustic pattern of the phoneme /ba/ in normal-hearing adults.

Author information

1
Université Claude Bernard Lyon I, Université de Lyon, Laboratoire Neurosciences Sensorielles, Comportement, Cognition, CNRS UMR 5020, Hôpital Edouard Herriot, Pavillon U - 5, pl. d'Arsonval, F-69003 Lyon, France. idrick.akhoun@chu-lyon.fr

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.

PMID:
18291717
DOI:
10.1016/j.clinph.2007.12.010
[Indexed for MEDLINE]

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