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Vocal Fundamental Frequency Variability in Young Children : A Comment on Developmental Trends in Vocal Fundamental Frequency of Young Children
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lahey, Margaret Flax, Judy F. Harris, Tt Katherine Boothroydtttt, Arthur |
| Copyright Year | 2009 |
| Abstract | One of the major finding of Robb and Saxman (1985) regarding mean fundamental frequency (FOl of children aged 11 to 25 months was the high variability found among utterances particularly for the youngest children (Le., the 11-16month-oIds). Robb and Saxman hypothesized that such variability may have been related to the onset of purposeful communication. The data presented below further refine this hypothesis and suggest a strong relationship between the Fa and the communicative function on infants' vocalizations. In a study designed to see of prosodic variables were related to communicative functions (Flax, 1986; Flax, Lahey, Harris, & Boothroyd, in press), we videotaped I-hour mother-child interactions of 3 normally developing children (AL, AB, & RS) at three points in time. At Time 1 the mothers reported that the children were producing noncrying vocalizations that could be interpreted as serving some communicative function; at Time 2, the mothers' diary entries indicated a ten-word vocabulary; at Time 3 the entries showed a vocabulary of about 50 words. The ages sampled ranged from about 11 months to about 14 months (see Table 1). The video recordings were made using a portable camera (GE, ICVA4035E) and video cassette recorder (GE, ICVD4040X). In order to provide signals of appropriate quality for subsequent pitch extraction, additional audio recordings of the child's utterances were simultaneously made using a Realistic FM wireless microphone (32-1220T) and an audio cassette recorder (Sony, TC-FX22). The transmitter of the wireless microphone was placed in a small pocket attached to the back of a zippered vest worn by the child. The vest was an adaptation of the "telebib" developed by Bauer (Kent & Bauer, 1985). The microphone itself was clipped to the inside front of the vest at the neck. The child's mother also wore a lapel microphone that was connected directly to the second channel of the cassette recorder. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.haskins.yale.edu/sr/SR105/SR105_17.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
