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Results for “Auditory Perceptual Disorders”

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At least 19 recordsLinked to original sources
PubMed1977

The performance of children with auditory perceptual disorders on a time-compressed speech discrimination measure.

A time-compressed version of the PB-K 50 speech discrimination measure was administered to 20 children diagnosed as displaying auditory perceptual disorders. Results indicated that these children performed equally well at both 0 and 30% time compression. Performance decreased significantly at 60% time compression. Comparison of the results with normative data indicated that performance of the two groups of children was similar at the 30% time compression condition but that children with auditory perceptual disorders performed poorer at both 0 and 60% time compression. The results were discussed relative to short-term memory abilities.

Auditory Perception↗
PubMed1992

The predictive validity and accuracy of a screening test for language delay and auditory perceptual disorder.

Infants (321) who had been screened for language delay and auditory perceptual problems at 9 months of age were evaluated 1 year later. Of these infants 88.6% were correctly classified as at-risk or not-at-risk of delayed linguistic development. The correlation between performance on the screen and on a language scale was 0.49. The great majority of those with receptive and expressive delay continued to show problems at 2 years of age, whereas half of those with expressive delay alone were within normal limits. No evidence was found that a history of fluctuating hearing loss contributed to the development of either language delay or auditory perceptual problems.

Auditory Perceptual Disorders↗
PubMed1983

[Recovery process of auditory perceptual disorders in a child with word deafness].

The patient was a right-handed boy. Pregnancy and delivery were normal. There were no neonatal complications. His development was normal until the age of 6 years and 10 months when he suddenly fell into coma. He was admitted to a hospital, where he was diagnosed as having encephalopathy of unknown cause. It was found that he did not respond to verbal stimuli after recovery from coma. He was referred to our hospital for detailed examination of hearing at the age of 7 years, and received neuroradiological and audiological examinations including X-ray CT, positron-CT, behavioral audiometry, auditory evoked response audiometry as well as other hearing and speech tests. Pure tone audiometry showed that auditory thresholds for pure tones ranging from 125 to 8,000 Hz were normal, while speech audiometry demonstrated that he was unable to discriminate test words. However, he accurately recognized environmental sounds and noises as well as sounds produced by musical instruments. The decreased uptake of 11C-glucose at the left temporal lobe was demonstrated by positron CT, although no abnormality was showed by X-ray CT. WISC-R showed he had normal intelligence. ITPA demonstrated that the psycholinguistic ability via visual channel remained intact, whereas auditory memory and auditory closure were markedly impaired. The boy had no difficulties in reading, naming and writing. Speech therapy was started as soon as diagnosis of word deafness was made. Until 6 months after onset, he never understood and repeated what was said to him.(ABSTRACT TRUNCATED AT 250 WORDS)

Aphasia↗
PubMed1985

Acoustic reflex abnormalities in behaviorally disturbed and language delayed children.

Contralateral and ipsilateral acoustic reflex thresholds were measured in 62 subjects referred for suspected delays in development of language, learning disabilities, or disorders of auditory processing, with normal peripheral hearing thresholds and normal tympanometry. Thirty-two percent of the subjects in this study showed abnormal contralateral and ipsilateral acoustic reflex thresholds. Both contralateral and ipsilateral acoustic reflex thresholds were involved when subjects showed abnormal reflex thresholds. Although a high percentage of abnormal acoustic reflexes occurred in this population, no strong correlation could be found with specific areas of language delay. A slight positive correlation was found between abnormal acoustic reflexes and delayed psychomotor development. Increased or absent acoustic reflex thresholds are usually associated with peripheral or low brain stem pathologies. While not conclusive, these results suggest brain stem involvement in this population.

Adolescent↗
PubMed2003

[The Oldenburg children's rhyme test during speech simulating noise disturbance (Regensburg variant). Modification of the test and normal values for the ages 7-10 years].

OBJECTIVE: Of the German language speech audiometry tests used for children, only the Oldenburg children's rhyme test is constructed to allow measurements in noise. Unfortunately, no reference values exist for such measurements. Many of children admitted to test speech discrimination in noise are suspected of suffering from central auditory processing disorders and/or attention deficits. Thus, the objective of the present study is the development of a speech-in-noise test that focuses the children's attention on the target words. DESIGN: A speech-simulating noise was added to the Oldenburg children's rhyme test and the discrimination function was estimated. First, the total power of all target words was equalised and the total power of the noise adjusted to obtain a constant signal-to-noise ratio (SNR) for all target words. Second, speech and noise were presented binaurally with headphones. Speech was presented at 65 dB SPL and the noise level varied to obtain SNRs of 0, -5 and -10 dB SN. A total of 55 normal children, 7-10 years of age, were also tested. RESULTS: Mean speech discrimination was 91+/-7% at 0 dB SN, 75+/-11% at -5 dB SN and 55+/-14% at -10 dB SN. The discrimination function results in a speech reception threshold (SRT) of -10.9 dB SN and a maximum slope of 4.95%/dB SN. CONCLUSION: The "Regensburg" variation of the "Oldenburg children's rhyme test" was easily feasible in all tested children. The results can be used as normative data for children between 7 and 10 years.

Age Factors↗
PubMed2001

[Intensive inpatient therapy of auditory processing and perceptual disorders in childhood].

UNLABELLED: PRELIMINARY REMARKS: The prevalence of central auditory processing disorders (CAPD) is supposed to be 2-3% of all children. Given the number of affected children and restricted resources in the public health there is a need for an effective and evaluated therapeutic approaches. On the other hand the number of outcome studies is remarkably small. PATIENTS AND METHODS: The presented study reports strategies and pitfalls in outcome measurements of 34 children with CAPD, based upon a 3-weeks indoor therapeutic intervention. Diagnostic criteria of auditory processing and perception were recorded before and after therapy. RESULTS: The data shows a highly significant improvement of certain perceptive abilities, including audiological parameters (dichotic testing, discrimination, loudness scaling) and awareness, psycholinguistic development and orthographic tests. CONCLUSION: The study demonstrates that an effective therapy of CAPD in children is possible and scientifically proven. Long term surveillance however seems to be necessary. It also has to be studied whether intensive indoor treatment is superior or equal to out clinic therapy.

Auditory Perceptual Disorders↗
PubMed1986

Pure-tone pitch anomalies. II. Pitch-intensity effects and diplacusis in impaired ears.

Pitch-intensity functions and psychophysical tuning curves (PTC's) were measured in ten listeners with sensorineural impairments of presumed cochlear origin. Masking patterns, frequency jnd's, diplacusis measurements, and octave adjustments were also obtained for selected conditions in selected listeners. The results showed a tendency for increased frequency jnd's and increased pitch-matching variability in frequency regions where frequency resolution, as determined by PTC Q10 estimates, was degraded. The results also showed exaggerated pitch-level effects, both in regions where frequency resolution was degraded and, in many cases, in regions where thresholds and frequency resolution were apparently normal. The usual manifestation of exaggerated pitch-level effect was an abnormally large negative pitch shift with increasing level, particularly at low frequencies. The limited data from diplacusis measurements and octave adjustments suggest that the exaggerated negative pitch shifts are the consequence of a large increase in pitch at low stimulus levels which "recruits" at higher levels. These results are difficult to explain with simple tonotopic models, or presently formulated temporal models, of pure-tone pitch encoding.

Acoustic Stimulation↗
PubMed2002

Auditory processing efficiency deficits in children with developmental language impairments.

The "temporal processing hypothesis" suggests that individuals with specific language impairments (SLIs) and dyslexia have severe deficits in processing rapidly presented or brief sensory information, both within the auditory and visual domains. This hypothesis has been supported through evidence that language-impaired individuals have excess auditory backward masking. This paper presents an analysis of masking results from several studies in terms of a model of temporal resolution. Results from this modeling suggest that the masking results can be better explained by an "auditory efficiency" hypothesis. If impaired or immature listeners have a normal temporal window, but require a higher signal-to-noise level (poor processing efficiency), this hypothesis predicts the observed small deficits in the simultaneous masking task, and the much larger deficits in backward and forward masking tasks amongst those listeners. The difference in performance on these masking tasks is predictable from the compressive nonlinearity of the basilar membrane. The model also correctly predicts that backward masking (i) is more prone to training effects, (ii) has greater inter- and intrasubject variability, and (iii) increases less with masker level than do other masking tasks. These findings provide a new perspective on the mechanisms underlying communication disorders and auditory masking.

Adult↗
PubMed1988

Pediatric central auditory dysfunction. Comparison of children with confirmed lesions versus suspected processing disorders.

This study compared and contrasted results on pure tone audiometry, acoustic reflexes, and the Pediatric Speech Intelligibility Test in children with either documented or suspected central auditory dysfunction. Ages ranged from 3 years, 2 months, to 8 years, 4 months. In children with confirmed CNS lesions, results were consistently normal for children with lesions in nonauditory areas of the brain and consistently abnormal for children with lesions in areas of the brain important for auditory perceptual function. The patterns of abnormality were consistent with previous findings in adults. In children with suspected central auditory processing disorders (CAPDs), audiometric findings typically showed normal hearing sensitivity, abnormal (rising) audiometric contours, normal acoustic reflexes, normal degraded monotic speech perception, and abnormal dichotic speech perception. This pattern of results was similar to findings in children with confirmed temporal lobe lesions. Overall, results supported an auditory perceptual, rather than a linguistic, basis for CAPDs.

Auditory Diseases, Central↗
PubMed2004

Perceptual consequences of disrupted auditory nerve activity.

Perceptual consequences of disrupted auditory nerve activity were systematically studied in 21 subjects who had been clinically diagnosed with auditory neuropathy (AN), a recently defined disorder characterized by normal outer hair cell function but disrupted auditory nerve function. Neurological and electrophysical evidence suggests that disrupted auditory nerve activity is due to desynchronized or reduced neural activity or both. Psychophysical measures showed that the disrupted neural activity has minimal effects on intensity-related perception, such as loudness discrimination, pitch discrimination at high frequencies, and sound localization using interaural level differences. In contrast, the disrupted neural activity significantly impairs timing related perception, such as pitch discrimination at low frequencies, temporal integration, gap detection, temporal modulation detection, backward and forward masking, signal detection in noise, binaural beats, and sound localization using interaural time differences. These perceptual consequences are the opposite of what is typically observed in cochlear-impaired subjects who have impaired intensity perception but relatively normal temporal processing after taking their impaired intensity perception into account. These differences in perceptual consequences between auditory neuropathy and cochlear damage suggest the use of different neural codes in auditory perception: a suboptimal spike count code for intensity processing, a synchronized spike code for temporal processing, and a duplex code for frequency processing. We also proposed two underlying physiological models based on desynchronized and reduced discharge in the auditory nerve to successfully account for the observed neurological and behavioral data. These methods and measures cannot differentiate between these two AN models, but future studies using electric stimulation of the auditory nerve via a cochlear implant might. These results not only show the unique contribution of neural synchrony to sensory perception but also provide guidance for translational research in terms of better diagnosis and management of human communication disorders.

Acoustic Stimulation↗