Hapsburg, D. & Davis, B. (2006). Auditory Sensitivity and the Prelinguistic Vocalizations of Early-Amplified Infants. Journal of Speech, Language and Hearing Research, vol. 49, 809-822.

Description of Research Design:

This was an empirical study. This study used the groundwork of past researchers and their findings to explore the unanswered questions, which was the on-set for this study.

The study was conducted with 15 infants who’s pure-tone average (PTA) ranged from 25dB to 120dB in the better hearing ear. All participants had at least 6 months of early hearing-aid experience and their parents used oral communication.

Did it Work? Was the Research Convincing?

Does the auditory sensitivity play a part in the development of vocalization patterning?

Based on the data:

(a) The infants with a hearing loss produced more utterances than normal hearing, proving PTA does play a role in the amount of utterances produced.

(b) There was not enough consistency to determine results.

(c) The CV (consonant vowel) appeared to be the leading choice in all three groups.

(d) There was no significant difference in the three groups.

(e) There appeared to be no significant association between PTA and consonant-onset.

(f) The only significance found was the dorsal consonants.

Key Parts of Research:

§  This is not an easy study due to the complexity of the subsystems.

§  The study of children with a hearing loss and their production on vocalization patterns can provide important information.

§  The lower jaw grows to be adult-like by the age of 2. This development aids infants towards the babbling stage.

§  The subsystems are connected with the vocalization phases.

Veracity of the Data:

The study finds the results are similar to that of past studies’ and their results. For the most part, the results had an 80% agreement between the transcribers. However, the results for a-f was a bit skeptical with variations of p<.00-.10

Resulting Insights and Questions:

A.  Knowing the difference between canonical babbling and the beginning of speech-like sounds.

B.  Early amplification does not “trigger” the patterns found in normal hearing infants.

C.  Visual modality is acquired before auditory.