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A Boothroyd

Publications and source records attributed to A Boothroyd.

22 records · Page 2Linked to original sources
PubMed1986

Lipreading with tactile supplements.

Lipreading performance, after brief training, was measured in two normal subjects, as the percentage of words recognized in sets of unrelated sentences. Three receptive conditions were used: lipreading alone, lipreading plus a single-channel tactile display of fundamental frequency (temporal only), and lipreading plus a multichannel, tactile, spatial display of fundamental frequency (temporal-spatial). After training, performance with tactile supplements was better than without, but it was not possible to conclude that either of the tactile displays was better than the other. During training, a significant correlation between performance and session number was found for the temporal-spatial display only.

Female↗
PubMed1985

Evaluation of speech production of the hearing impaired: some benefits of forced-choice testing.

The speech production performance of 16 hearing-impaired subjects (thresholds 82-110 dB HL) was measured using both experienced and inexperienced listeners. Four types of measure were obtained: score on a forced-choice test requiring the production of eight segmental contrasts, recognition probability for phonemes produced in consonant-vowel-consonant (CVC) words, recognition probability for CVC words produced in a simple carrier phrase, and recognition probability for words produced in sentence context. The experienced listeners gave higher scores than did the inexperienced listeners, but the magnitude of the effect decreased with decreasing linguistic redundancy in the test material, falling to only 1.3 percentage points for the forced-choice test. The pattern of performance across the eight contrasts of the forced-choice test changed significantly from subject to subject. Performance on the contrast test accounted for 70% of the variance in the scores on the sentence test. The results demonstrate that forced-choice tests can be used to provide speech production measures that are virtually independent of listener experience, that provide analytic detail about an individual's production of phonetic contrasts, and that are reasonably predictive of the intelligibility of speech produced in more natural communicative settings.

Adolescent↗
PubMed1976

Assessment of nasalization in the speech of deaf children.

Nasality is widely recognized as a problem in the speech of many deaf people. This paper describes one approach to the assessment of nasalization and to the development of visual aids to assist in training of velopharyngeal control. The approach involves detection of the velopharyngeal opening during voiced sounds by means of a small accelerometer attached to the nose, and presentation of the accelerometer output on a computer-controlled visual display. The display may be used as a training aid, or for the purpose of analyzing either recorded or live speech. Objective data are presented on some of the properties of the accelerometer output for the speech of people with normal hearing and of a number of children whose hearing is severely impaired. These data show inadequate velopharyngeal control, particularly improper nasalization of certain vowels, for a significant number of the deaf children. For a group of the hearing-impaired children, subjective judgments of the adequacy of velopharyngeal control and of other speech attributes were obtained. Correlations among these judgments and relations between judgments of adequacy of velopharyngeal control and the objective measures of nasalization are shown. Some comments are made on the development of procedures for the training of velopharyngeal control using the display as an aid.

Acoustics↗