[What is the role of large muscle performance in children with severe specific language development disorder?].
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Auditory Perceptual Disorders↗
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Auditory neurophysiologic responses and discrimination deficits in children with learning problems.
Children with learning problems often cannot discriminate rapid acoustic changes that occur in speech. In this study of normal children and children with learning problems, impaired behavioral discrimination of a rapid speech change (/dalpha/versus/galpha/) was correlated with diminished magnitude of an electrophysiologic measure that is not dependent on attention or a voluntary response. The ability of children with learning problems to discriminate another rapid speech change (/balpha/versus/walpha/) also was reflected in the neurophysiology. These results indicate that some children's discrimination deficits originate in the auditory pathway before conscious perception and have implications for differential diagnosis and targeted therapeutic strategies for children with learning disabilities and attention disorders.
Adolescent↗
Temporal processing deficits in Hebrew speaking children with reading disabilities.
The purpose of this study was to assess to what extent specific reading disabilities and poor phonologic processing in children who read Hebrew, a primarily consonant orthography, are related to central auditory temporal processing deficits (TPDs).Twenty-four Hebrew-speaking children (ages 10-13) with and without reading disabilities were asked to discriminate auditorily pairs of syllables (/ba/ vs. /pa/) that differ by voice onset time (VOT) only. Two paradigms were used, 1 with a short interstimulus interval (ISI) (50 ms) and 1 with a long ISI (500 ms). Event-related potentials (ERPs) were measured in response to the two syllables in an auditory oddball task. Results showed significantly lowered accuracy, longer reaction times, and prolonged P3 latency among the group with reading disabilities compared with the control group. No significant differences were found between the short ISI task and the long ISI task. However, significant correlations were found between the phonologic processing tasks and the short ISI task. These findings in the Hebrew language are consistent with findings from other languages and add support to the central TPD hypothesis of reading disabilities. The discussion highlights how investigating different orthographic systems can deepen our understanding of the role TPD plays in reading.
Adolescent↗
[Subjective assessment of auditory processing deficits and perceptual performance in children].
BACKGROUND: Auditory processing disorders (APD) result from dysfunctions in processes dedicated to audition. They effect the processing of information in the auditory modality. Besides several audiometric procedures, the suggestion has been made to use a newly developed questionnaire to assess APD; however, data on the reliability and validity of this psychometric tool are still lacking. METHODS: In a retrospective analysis, questionnaire data from 483 children referred to us because of suspected APD were examined and a factorial analysis was performed. RESULTS: Only one factor could be extracted. However, this did not explain much of the variance. DISCUSSION: According to our results, APD can be assumed to be a one dimensional construct. In addition, noise hypersensitivity may be separable from other APD complaints.
Adolescent↗
[Objective diagnosis of central auditory processing and perception disorder].
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Auditory Pathways↗
Language disabilities in children: perceptual correlates.
Although language disabilities in children manifest themselves as a failure to develop linguistic skills normally at or near the expected age, the underlying etiology of this prevalent developmental disorder is not well understood. Recent research studies provide empirical evidence that demonstrates a preponderance of basic perceptual disorders in some children with developmental language delay. These studies are reviewed and the possible role of specific perceptual impairments in various language disorders is discussed.
Auditory Perceptual Disorders↗
Clinical and audiological findings in a case of auditory agnosia.
A case is reported of severe agnosia for verbal and non-verbal sounds without associated aphasic disorder. A CT scan revealed bilateral, temporal lobe lesions from two ischaemic accidents that had occurred 9 months apart. The search for subtle deficits in the patient showed normal sensitivity to changes in the intensity and frequency of simple sounds; in contrast, his ability to discriminate sound duration and musical note sequences was severely impaired. The simultaneous recording of the whole auditory-evoked response pattern revealed no abnormality in the early components, which reflect the activation of the auditory nuclei and pathways of the brain stem. However, the middle and late components were delayed and slowed. These results and others in the literature suggest that the neocortex in man, as in other mammals, plays an essential role in the temporal aspects of hearing. Also, the two main ingredients commonly recognized in auditory agnosia, i.e. word deafness and the inability to interpret non-verbal sounds, are caused by the disruption of elementary, bilaterally represented cortical functions which start the processing of every kind of auditory information.
Agnosia↗
ABR and auditory P300 findings in children with ADHD.
Auditory processing disorders (APD), also referred as central auditory processing disorders (CAPD) and attention deficit hyperactivity disorders (ADHD) have become popular diagnostic entities for school age children. It has been demonstrated a high incidence of comorbid ADHD with communication disorders and auditory processing disorder. The aim of this study was to investigate ABR and P300 auditory evoked potentials in children with ADHD, in a double-blind study. Twenty-one children, ages between 7 and 10 years, with a primary diagnosis of ADHD, participated in this experiment. Results showed that all children had normal ABR with normal latency for wave V. Results also showed that among 42 ears combined 52.38% did not have P300. For the medicated subjects we observed that among 28 ears, 42.85% did not have P300 and for the non-medicated 71.43% (N = 14 ears) did not have P300. Our results suggest that the medicated subjects had more presence of P300 (57.15%) than the non-medicated group (28.57%), though the absence of these potentials were high among the group--52.38%.
Attention Deficit Disorder with Hyperactivity↗
Auditory perceptual abilities of formerly misarticulating children.
12 children who recently had satisfactorily completed therapy for 4+ phonemes, and normal controls, were given tasks of auditory perception consisting of (a) repeating 5-word recorded sentences (0, 1st- and 2nd-order approximations) at 0 and at 60% time compression, and (b) diotic and dichotic presentations at 40 db SL of the WIPI test split into 2 bandwidths (500-580 and 1950-2080 c/s). Results showed that the performance of the experimental Ss was significantly poorer than that of age-matched controls on time-compressed speech, but not on the binaural fusion task. The greatest diagnostic potential for time-compressed speech was at 60% compression. Results contrasted with previous data showing significantly poorer performance of severely misarticulating children on a binaural summation task (Flowers and Costello, J. Aud. Res., 1963, 3, 133-140). There is a need to monitor the auditory perceptual abilities of formerly misarticulating children with a battery of more than a single test.
Articulation Disorders↗
Perception of voice and tone onset time continua in children with dyslexia with and without attention deficit/hyperactivity disorder.
Tasks assessing perception of a phonemic contrast based on voice onset time (VOT) and a nonspeech analog of a VOT contrast using tone onset time (TOT) were administered to children (ages 7.5 to 15.9 years) identified as having reading disability (RD; n = 21), attention deficit/hyperactivity disorder (ADHD; n = 22), comorbid RD and ADHD (n = 26), or no impairment (NI; n = 26). Children with RD, whether they had been identified as having ADHD or not, exhibited reduced perceptual skills on both tasks as indicated by shallower slopes on category labeling functions and reduced accuracy even at the endpoints of the series where cues are most salient. Correlations between performance on the VOT task and measures of single word decoding and phonemic awareness were significant only in the groups without ADHD. These findings suggest that (a) children with RD have difficulty in processing speech and nonspeech stimuli containing similar auditory temporal cues, (b) phoneme perception is related to phonemic awareness and decoding skills, and (c) the potential presence of ADHD needs to be taken into account in studies of perception in children with RD.
Attention Deficit Disorder with Hyperactivity↗
[Hemianacousia, an auditory deficit in one hemisphere].
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Aphasia↗
Auditory perceptual impairments in children with specific language disorders: a review of the literature.
This article reviews the literature on auditory perceptual impairments in children with language disorders. It is suggested that, rather than a higher-order cognitive or "linguistic" deficit, the underlying deficit in childhood language disorders is a perceptual one. The perceptual impairment may consist of a deficiency in detecting acoustic features in the speech wave that normally cue certain phonemes. Support for this hypothesis comes from clinical observations and experimental studies of aphasic adults as well as language-disordered children. The most consistent finding of the studies with language-disordered children has been that they have difficulty making perceptual judgments of the order of rapid sequences of brief sounds, such as synthetic speech and non-speech stimuli. However, these children perceive the sequences more accurately if the duration of the stimuli or the inter-stimulus intervals are extended. This suggests a "rate-specific" auditory perceptual deficit in language-disordered children for rapid acoustic information, such as the distinctive acoustic features of speech sounds. Treatment and future research implications are discussed.
Aphasia↗
[Auditory processing disorder versus attention deficit/hyperactivity disorder. A dysfunction complex or different entities?].
BACKGROUND: It has been suggested that auditory processing disorders (APD) and attention deficit/hyperactivity disorders (ADHD) may be the same entity with slightly differing symptoms. For testing this theory we compared parents' ratings of APD and ADHD behavioural characteristics. METHODS: A retrospective study was carried out with parents rating 312 children (113 girls and 199 boys; 6.0-9.11 years old, nonverbal intelligence IQ 95 or above) using APD and ADHD questionnaires. RESULTS: Significant, albeit weak correlations between several APD and ADHD subscale scores were found. Correlations between selective listening and attention behaviours approximated clinical relevance (rho >0.4). Factor analysis revealed two factors with APD behaviour loading on one and ADHD behaviour on a second different factor. Using a categorical approach, it appears that ADHD children have significantly more APD problems than children without ADHD. DISCUSSION: These data are consistent with the hypothesis that APD and ADHD overlap partly while still being distinct entities. In addition to dimensional aspects, the parents' rating may provide a guideline for establishing a diagnosis based on categorical distinctions.
Attention Deficit Disorder with Hyperactivity↗
Abnormal selective attention normalizes P3 amplitudes in PDD.
This paper studied whether abnormal P3 amplitudes in PDD are a corollary of abnormalities in ERP components related to selective attention in visual and auditory tasks. Furthermore, this study sought to clarify possible age differences in such abnormalities. Children with PDD showed smaller P3 amplitudes than controls, but no abnormalities in selective attention. Adolescents with PDD showed abnormal selective attention, as reflected by larger auditory Processing Negativity (PN) and visual N2b, but no P3 abnormalities. Dipole localizations revealed that the locations of PN generators in subjects with PDD differed from controls. It was concluded that the abnormalities in selective attention in adolescents with PDD have a normalizing effect on P3, and possibly act as a compensatory process.
Adolescent↗
A meme's eye view of speech-language pathology.
In this article, the reason why certain terms, labels, and ideas prevail, whereas others fail to gain acceptance, will be considered. Borrowing the concept of "meme" from the study of evolution of ideas, it will be clear why language-based and phonological disorders have less widespread appeal than, for example, auditory processing and sensory integration disorders. Discussion will also center on why most speech-language pathologists refer to themselves as speech therapists or speech pathologists, and why it is more desirable to have dyslexia than to have a reading disability. In a meme's eye view, science and logic do not always win out because selection favors ideas (memes) that are easy to understand, remember, and copy. An unfortunate consequence of these selection forces is that successful memes typically provide superficially plausible answers for complex questions.
Aphasia↗
Attentive and preattentive processing in narcolepsy as revealed by event-related potentials (ERPs).
Narcolepsy is a neurological disorder, characterised by excessive daytime sleepiness, sleep attacks, cataplexy and abnormal manifestations of rapid eye movement sleep. Recent studies suggest that neuropsychological impairments in narcolepsy may include memory and attention deficits due to a monoaminergic or cholinergic transmitter dysfunction. To explore the nature of cognitive problems, the P300 and mismatch negativity (MMN) event-related potentials were investigated in narcoleptic patients and matched controls. Narcoleptics showed significantly increased P300 amplitudes relative to controls, especially at frontal recording sites. While control subjects exhibited typically larger MMN over the right than the left hemisphere, in particular at frontal and central electrodes, narcoleptics did not show this asymmetry. These results are interpreted as possible alterations in cognitive preattentive and attentive processing associated with altered functioning of the prefrontal cortex in narcolepsy.
Acoustic Stimulation↗
Mismatch negativity in the neurophysiologic/behavioral evaluation of auditory processing deficits: a case study.
The subject of this case report is an 18-year-old woman with grossly abnormal auditory brain stem response (ABR), normal peripheral hearing, and specific behavioral auditory processing deficits. Auditory middle latency responses (MLRs) and cortical potentials N1, P2, and P300 were intact. The mismatch negativity (MMN) was normal in response to certain synthesized speech stimuli and impaired to others--consistent with her behavioral discrimination of these stimuli. Behavioral tests of auditory processing were consistent with auditory brain stem dysfunction. A neuropsychological evaluation revealed normal intellectual and academic performance. The subject was in her first year of college at the time of the evaluation. This case study is important because: (1) Although there have been several reports of absent/abnormal ABR with preserved peripheral hearing and deficits in auditory processing, little is known about the specific nature of the auditory deficits experienced by these individuals. Such information may be valuable to the clinical management of patients with this constellation of findings. (2) Of interest is the information that the mismatch negativity (MMN) cortical event-related potential can bring to the evaluation of patients with auditory processing deficits. The MMN reflects central auditory processing of small acoustic differences and may provide an objective measure of auditory discrimination. (3) From a theorectical standpoint, a patient with neural deficits affecting specific components of the auditory pathway provides insight into the relationship between evoked potentials and physiological mechanisms of auditory processing. How do various components of the auditory pathway contribute to speech discrimination? How might evoked potentials reflect the processes underlying the neural coding of specific features of speech stimuli such as timing and spectral cues?
Achievement↗
Neurophysiological effects of stimulants.
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Attention Deficit Disorder with Hyperactivity↗