Envelope following responses to natural vowels were recorded in 10 normal hearing people. Responses were recorded to individual vowels (/ɑ/, /i/, /u/) with a relatively steady pitch, to /∧/ with a variable and steady pitch, and to a multivowel stimulus (/∧ui/) with a steady pitch. Responses were analyzed using a Fourier analyzer, so that recorded responses could follow the changes in the pitch. Significant responses were detected for all subjects to /ɑ/, /i/ and /u/ with the time required to detect a significant response ranging from 6 to 66 s (average time: 19 s). Responses to /∧/ and /∧ui/ were detected in all subjects, but took longer to demonstrate (average time: 73 s). These results support the use of a Fourier analyzer to measure envelope following responses to natural speech.

Keywords:
Envelope following responses, Auditory steady state responses, Evoked potentials, Speech perception, Fourier analyzer
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© 2006 S. Karger AG, Basel
2006
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