Auditory temporal order discrimination and backward recognition masking in adults with dyslexia. 2003

Yvonne M Griffiths, and Nicholas I Hill, and Peter J Bailey, and Margaret J Snowling
Department of Psychology, University of Essex, Colchester, Essex, United Kingdom. ymg@essex.ac.uk

The ability of 20 adult dyslexic readers to extract frequency information from successive tone pairs was compared with that of IQ-matched controls using temporal order discrimination and auditory backward recognition masking (ABRM) tasks. In both paradigms, the interstimulus interval (ISI) between tones in a pair was either short (20 ms) or long (200 ms). Temporal order discrimination was better for both groups of listeners at long than at short ISIs, but no group differences in performance were observed at either ISI. Performance on the ABRM task was also better at long than at short ISIs and was influenced by variability in masker frequency and by the spectral proximity of target and masker. The only significant group difference was found in one condition of the ABRM task when the target-masker interval was 200 ms, but this difference was not reliable when the measure was of optimal performance. Moderate correlations were observed between auditory thresholds and phonological skill for the sample as a whole and within the dyslexic and control groups. However, although a small subgroup of dyslexic listeners with poor phonology was characterized by elevated thresholds across the auditory tasks, evidence for an association between auditory and phonological processing skills was weakened by the finding of a subgroup of control listeners with poor auditory processing and normal phonological processing skills.

UI MeSH Term Description Entries
D008297 Male Males
D010470 Perceptual Masking The interference of one perceptual stimulus with another causing a decrease or lessening in perceptual effectiveness. Masking, Perceptual,Maskings, Perceptual,Perceptual Maskings
D010700 Phonetics The science or study of speech sounds and their production, transmission, and reception, and their analysis, classification, and transcription. (Random House Unabridged Dictionary, 2d ed) Speech Sounds,Sound, Speech,Sounds, Speech,Speech Sound
D010897 Pitch Discrimination The ability to differentiate sound frequency or pitch. Discrimination, Pitch,Pitch Discriminations
D004410 Dyslexia A cognitive disorder characterized by an impaired ability to comprehend written and printed words or phrases despite intact vision. This condition may be developmental or acquired. Developmental dyslexia is marked by reading achievement that falls substantially below that expected given the individual's chronological age, measured intelligence, and age-appropriate education. The disturbance in reading significantly interferes with academic achievement or with activities of daily living that require reading skills. (From DSM-IV) Alexia,Dyslexia, Developmental,Reading Disability, Developmental,Reading Disorder,Reading Disorder, Developmental,Developmental Reading Disorder,Word Blindness,Alexias,Blindness, Word,Blindnesses, Word,Developmental Dyslexia,Developmental Dyslexias,Developmental Reading Disabilities,Developmental Reading Disability,Developmental Reading Disorders,Disabilities, Developmental Reading,Disability, Developmental Reading,Disorder, Developmental Reading,Disorder, Reading,Disorders, Developmental Reading,Disorders, Reading,Dyslexias,Dyslexias, Developmental,Reading Disabilities, Developmental,Reading Disorders,Reading Disorders, Developmental,Word Blindnesses
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D001307 Auditory Perception The process whereby auditory stimuli are selected, organized, and interpreted by the organism. Auditory Processing,Perception, Auditory,Processing, Auditory
D001309 Auditory Threshold The audibility limit of discriminating sound intensity and pitch. Auditory Thresholds,Threshold, Auditory,Thresholds, Auditory

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