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T Letowski

Publications and source records attributed to T Letowski.

5 recordsLinked to original sources
PubMed1992

Relationships between speech recognition threshold, average hearing level, and speech importance noise detection threshold.

The aim of this study was to determine (a) if the speech importance noise detection threshold (SINDT) could be used as an accurate estimator of speech recognition threshold (SRT), and (b) whether the SINDT correlates well with various measures of the pure-tone threshold average (PTA). Pure-tone threshold, SRT, and SINDT tests were administered to 94 adults with various degrees of hearing loss. The results demonstrated that SRT can be accurately predicted from SINDT and that these two are highly correlated (r = 0.97). Since a SINDT measurement takes less time than SRT determination, the SINDT test may be recommended as an alternative for SRT in some applications.

Adolescent↗
PubMed1992

High-frequency threshold measurements using insert earphones.

Several recent studies have reported large intersubject variability of high-frequency thresholds measured with circumaural earphones. In the present study, high-frequency thresholds of 10 subjects were measured with circumaural (Sennheiser HD-250) and insert (Etymotic ER-1) earphones at 10, 12, 14, and 16 kHz. Overall results show significantly smaller variability of the threshold data obtained with insert earphones than with circumaural earphones. The above data indicate that insert earphones may be more suitable for high-frequency testing than circumaural earphones.

Acoustic Stimulation↗
PubMed1986

Induction loop listening system designed for a classroom.

The principles of designing an induction loop listening system are discussed. Step-by-step procedures for building an induction loop are presented. The loop described was installed in a medium-size classroom and listening tests were performed comparing the loop and loudspeakers. Two groups of hearing impaired listeners were used. One group of listeners wore hearing aids while the other group did not. Result indicated that for both groups, speech perception was enhanced with the loop system.

Correction of Hearing Impairment↗
PubMed1985

Vibrotactile performance by normal and hearing-impaired subjects using two commercially available vibrators.

The aim of this study was to measure vibrotactile sensitivity and stress pattern recognition of untrained normal-hearing and hearing-impaired subjects. Vibrotactile thresholds were measured as a function of frequency with two vibrators at three body placements. Stress pattern recognition was tested with two vibrators at two body placements. Vibrotactile threshold results indicate that wrist placements were less sensitive than fingertip placement and the hearing-impaired subjects were equally or less sensitive than the normal-hearing subjects. Vibrator plunger size had the greatest effect on threshold in the most sensitive frequency range of the skin. Stress pattern recognition results indicate that subject performance is a function of body placement but not a function of plunger size. Moreover, stress pattern recognition curves obtained in this study had lower plateaus for the hearing-impaired subjects than for the normal-hearing subjects. Implications for vibrotactile training are discussed.

Adult↗