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Effect of Repetition Rate on Speech Evoked Auditory Brainstem Response in Younger and Middle Aged Individuals.

Kumar Neupane A, Gururaj K, Mehta G, Sinha SK - Audiol Res (2014)

Bottom Line: The results of the present study also revealed that there was no difference in encoding of fundamental frequency between middle aged and younger individuals at any of the repetition rates.The above results suggest a differential effect of repetition rate on wave V latency and encoding of fundamental frequency.Further, it was noticed that repetition rate did not affect the amplitude of first formant frequency or second formant frequency in middle aged participants compared to the younger participants.

View Article: PubMed Central - PubMed

Affiliation: All India Institute of Speech and Hearing , Manasagangothri, India.

ABSTRACT
Speech evoked auditory brainstem responses depicts the neural encoding of speech at the level of brainstem. This study was designed to evaluate the neural encoding of speech at the brainstem in younger population and middle-aged population at three different repetition rates (6.9, 10.9 and 15.4). Speech evoked auditory brainstem response was recorded from 84 participants (young participants=42, middle aged participants=42) with normal hearing sensitivity. The latency of wave V and amplitude of the fundamental frequency, first formant frequency and second formant frequency was calculated. Results showed that the latency of wave V was prolonged for middle-aged individuals for all three-repetition rates compared to the younger participants. The results of the present study also revealed that there was no difference in encoding of fundamental frequency between middle aged and younger individuals at any of the repetition rates. However, increase in repetition rate did affect the encoding of the fundamental frequency in middle-aged individuals. The above results suggest a differential effect of repetition rate on wave V latency and encoding of fundamental frequency. Further, it was noticed that repetition rate did not affect the amplitude of first formant frequency or second formant frequency in middle aged participants compared to the younger participants.

No MeSH data available.


Fundamental frequency amplitude for younger and middle aged participants for 3-repetition rate.
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fig004: Fundamental frequency amplitude for younger and middle aged participants for 3-repetition rate.

Mentions: From the above table, it can be seen that as the repetition rate increases, the amplitude of the fundamental frequency decreases for both groups. It is also observed that the amplitude reduction is more for the middle-aged group compared to the younger group. The same can be seen in Figure 4.


Effect of Repetition Rate on Speech Evoked Auditory Brainstem Response in Younger and Middle Aged Individuals.

Kumar Neupane A, Gururaj K, Mehta G, Sinha SK - Audiol Res (2014)

Fundamental frequency amplitude for younger and middle aged participants for 3-repetition rate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4627139&req=5

fig004: Fundamental frequency amplitude for younger and middle aged participants for 3-repetition rate.
Mentions: From the above table, it can be seen that as the repetition rate increases, the amplitude of the fundamental frequency decreases for both groups. It is also observed that the amplitude reduction is more for the middle-aged group compared to the younger group. The same can be seen in Figure 4.

Bottom Line: The results of the present study also revealed that there was no difference in encoding of fundamental frequency between middle aged and younger individuals at any of the repetition rates.The above results suggest a differential effect of repetition rate on wave V latency and encoding of fundamental frequency.Further, it was noticed that repetition rate did not affect the amplitude of first formant frequency or second formant frequency in middle aged participants compared to the younger participants.

View Article: PubMed Central - PubMed

Affiliation: All India Institute of Speech and Hearing , Manasagangothri, India.

ABSTRACT
Speech evoked auditory brainstem responses depicts the neural encoding of speech at the level of brainstem. This study was designed to evaluate the neural encoding of speech at the brainstem in younger population and middle-aged population at three different repetition rates (6.9, 10.9 and 15.4). Speech evoked auditory brainstem response was recorded from 84 participants (young participants=42, middle aged participants=42) with normal hearing sensitivity. The latency of wave V and amplitude of the fundamental frequency, first formant frequency and second formant frequency was calculated. Results showed that the latency of wave V was prolonged for middle-aged individuals for all three-repetition rates compared to the younger participants. The results of the present study also revealed that there was no difference in encoding of fundamental frequency between middle aged and younger individuals at any of the repetition rates. However, increase in repetition rate did affect the encoding of the fundamental frequency in middle-aged individuals. The above results suggest a differential effect of repetition rate on wave V latency and encoding of fundamental frequency. Further, it was noticed that repetition rate did not affect the amplitude of first formant frequency or second formant frequency in middle aged participants compared to the younger participants.

No MeSH data available.