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Automatic and controlled processing of acoustic and phonetic contrasts
- Source :
-
Hearing Research . Apr2004, Vol. 190 Issue 1/2, p128. 13p. - Publication Year :
- 2004
-
Abstract
- Changes in the temporal properties of the speech signal provide important cues for phoneme identification. An impairment or inability to detect such changes may adversely affect one’s ability to understand spoken speech. The difference in meaning between the Finnish words tuli (fire) and tuuli (wind), for example, lies in the difference between the duration of the vowel /u/. Detecting changes in the temporal properties of the speech signal, therefore, is critical for distinguishing between phonemes and identifying words. In the current study, we tested whether detection of changes in speech sounds, in native Finnish speakers, would vary as a function of the position within the word that the informational changes occurred (beginning, middle, or end) by evaluating how length contrasts in segments of three-syllable Finnish pseudo-words and their acoustic correlates were discriminated. We recorded a combination of cortical components of event-related brain potentials (MMN, N2b, P3b) along with behavioral measures of the perception of the same sounds. It was found that speech sounds were not processed differently than non-speech sounds in the early stages of auditory processing indexed by MMN. Differences occurred only in later stages associated with controlled processes. The effects of position and attention on speech and non-speech stimuli are discussed. [Copyright &y& Elsevier]
- Subjects :
- *PHONETICS
*HEARING
*SOUND
*SPEECH
Subjects
Details
- Language :
- English
- ISSN :
- 03785955
- Volume :
- 190
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Hearing Research
- Publication Type :
- Academic Journal
- Accession number :
- 12651697
- Full Text :
- https://doi.org/10.1016/S0378-5955(04)00016-4