Graduate programs fall short.
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Audiology↗
Biomedical subjects
S R Rizzo
Publications and source records attributed to S R Rizzo.
Cochlear versus retrocochlear presbyacusis: clinical correlates.
This study reviews audiologic findings on cases of hearing-impaired elderly adults who were matched on the basis of peripheral hearing loss and who were divided into cochlear and retrocochlear groups on the basis of auditory brain stem response (ABR) test results. ABR test results were compared to other audiologic test results that included: (1) word-recognition scores and performance-intensity functions of phonetically balanced word lists; and (2) performance-intensity functions of Synthetic Sentence Identification lists with ipsilateral competing messages. The results of this study indicate that the retrocochlear group performed less favorably than the cochlear group on speech measures known to be sensitive to a retrocochlear site of disorder. This study further emphasizes the complexity of presbyacusis by demonstrating that peripheral hearing loss, alone, cannot account for the totality of the auditory problems that are encountered by elderly listeners.
Aged↗
A multidisciplinary approach to prosthetic management.
This study describes a multidisciplinary team approach to prosthetic management for inpatients. A Communication Management System summary sheet was developed to list all prosthetic devices owned and basic information concerning any existing communication problems. The summary sheet is to be posted in a wooden frame above the patients bed. A member of the nursing staff would be responsible for completing the pertinent data.
Communication↗
Effect of psychophysical backward masking on human brain-stem responses (ABR).
A backward-masking (BWM) paradigm was used to obtain measurements on 4 normal young adults of psychophysical BWM and of the analogous electrophysiological masking from human auditory brain-stem responses. The same stimuli and Ss were used in both experiments. Psychophysical BWM was determined to a 100-musec click masked by a 100-msec white noise after time delays of 1, 5, 10, 25, and 100 msec and at noise masker levels of 50, 65, and 80 db SPL. As previously demonstrated, more psychophysical BWM occurs at short delta ts (1 to 10 msec) than at longer delays and masked thresholds are greater as masker level increases. In the electrophysiological experiment, using delta ts = 1, 5, and 10 msec, the extent to which wave V latency was affected by the following masker was determined for various experimental conditions. Wave V latency increased with a decrease in delta t, for maskers above probe level, except that latency was not significantly affected by any masker level at delta t = 10 msec.
Acoustic Stimulation↗
Predicting hearing loss from the acoustic reflex.
An alternative procedure for predicting hearing threshold level (HTL) from the acoustic reflex threshold (ART) was explored. The ART was measured with an otoadmittance meter using pure tones (.5, 1, 2, or 4 kc/s) or noise-band (.1-1.6; 1.8-6; .1-6 kc/s) reflex-eliciting signals, on 75 normal Ss and 83 Ss with mild-to-severe sensorineural hearing loss. The largest positive linear relationship (R = .83) was found between the pure-tone average HTL at .5, 1, 2, and 4 kc/s vs the ART using the high-pass noise (1.8-6 kc/s) combined with the ART to .5 kc/s. Regression equations were developed to predict the 4-frequency PTA and other indexes of hearing sensitivity from these ARTs.
Adolescent↗
Correcting for ear canal collapse during audiometry.
The hearing thresholds of 20 subjects with normal hearing and normal ear canals and two subjects with collapsible ear canals were measured at octave frequencies from 250 to 8000 Hz under standard transducers (TDH-39) fitted with standard cushions (MX-41/AR) and experimental cushions (Telephonics 266CIII). When correction factors based on normal threshold differences were applied, thresholds obtained under the experimental cushion reasonably approximated the actual hearing of individuals with collapsible canals.
Adolescent↗