Effects of Voice Quality and Face Information on Infants' Speech Perception in Noise
A recent study by Polka, Rvachew, and Molnar (2008) found that 6- to 8-month-old infants do not discriminate a simple native consonant-vowel contrast when familiarized to it in the presence of distraction noise (i.e., recordings of crickets and birds chirping), even when testing was conducted in qui...
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| Format: | Others |
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/33084 http://scholar.lib.vt.edu/theses/available/etd-05212009-203927/ |
| Summary: | A recent study by Polka, Rvachew, and Molnar (2008) found that 6- to 8-month-old infants do
not discriminate a simple native consonant-vowel contrast when familiarized to it in the presence
of distraction noise (i.e., recordings of crickets and birds chirping), even when testing was
conducted in quiet. Because the distraction noise did not overlap with the phonemesâ
frequencies, failure to encode the familiarization phoneme could be due more to a disruption in
infant attention than to direct masking effects. Given that infants learn speech under natural
conditions involving noise and distraction, it is important to identify factors that may â protectâ
their speech perception under non-ideal listening conditions. The current study investigated
three possible factors: speech register, face information, and speaker gender. Six-month-old
infants watched a video of a female speaker producing a native phoneme in either an adultdirected
or infant-directed manner accompanied by the same background noise as in Polka et al.
(2008). After habituation, infants were tested with alternating trials of the familiar phoneme and
a novel phoneme in quiet. Phoneme discrimination was measured by recording infantsâ heart
rate and looking times during familiar and novel trials. Discrimination was poor in infants who
viewed a female speaker using adult-directed speech but was significantly improved (as seen in
both dependent measures of attention) when the female speaker used infant-directed speech.
Results indicate that common factors in the typical environment of infants can promote speech
perception abilities in noise. === Master of Science |
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