Development and application of a /bAk/–/dAk/ continuum for testing auditory perception within the Dutch longitudinal dyslexia study

Beinum, F.J. van; Schwippert, C.; Been, P.; Leeuwen, Theo H. van; Kuijpers, Cecile

doi:10.1016/j.specom.2005.04.003

Cited by 30 publications

(29 citation statements)

References 29 publications

(40 reference statements)

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“…A pattern of poor performance in quiet that worsens significantly in noise would suggest that phonemic categories in individuals with dyslexia may be underspecified and easily affected by further degradation of the signal. Overall, the group data revealed fewer across-group differences than many previous studies of speech perception abilities in adult dyslexics (e.g., Steffens et al, 1992;Schwippert and Koopmans-van Beinum, 1998;van Beinum et al, 2005). No significant differences between the AR and DYS groups were found in the steepness of the identification functions for a 'pea'/'bee' contrast both in quiet and in noise, nor for adaptive discrimination tasks for the same contrast.…”

Section: Discussioncontrasting

confidence: 59%

“…This view that individuals with dyslexia may benefit from the redundancy of acoustic cues that is present in natural speech is supported by some studies showing better performance with natural than with synthetic speech tests (Lieberman et al, 1985;Masterson, Hazan and Wijayatilake, 1995). However, differences in categorization between DYS and AR groups have been obtained both for studies using fully-synthetic continua (e.g., Steffens et al, 1992;Breier et al, 2001) and those using computer-edited natural speech (e.g., Schwippert and Koopmans-van Beinum, 1998;van Beinum et al, 2005;Manis et al, 1997).…”

Section: Discussionmentioning

confidence: 95%

“…More recent studies on the categorization of phonemic contrasts in adults with developmental dyslexia have tended to confirm this pattern of a lower degree of consistency in phoneme identification, which results in shallower slopes of the identification function (Schwippert and Koopmans-van Beinum, 1998;van Beinum, Schwippert, Been, van Leeuwen, Kuijpers, 2005).…”

Section: Introductionmentioning

confidence: 98%

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Speech Perception Abilities of Adults With Dyslexia: Is There Any Evidence for a True Deficit?

Hazan

Messaoud‐Galusi

Rosen

et al. 2009

J Speech Lang Hear Res

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Purpose: This study investigated whether adults with dyslexia show evidence of a consistent speech perception deficit by testing phoneme categorization and word perception in noise.Method: Seventeen adults with dyslexia and 20 average readers underwent a test battery including standardized reading, language and phonological awareness tests, and tests of speech perception. Categorization of a 'pea'/'bee' voicing contrast was evaluated using adaptive identification and discrimination tasks, presented in quiet and in noise, and a fixed-step discrimination task. Two further tests of word perception in noise were presented.Results: There were no significant group differences for categorization in quiet or noise, for across-and within-category discrimination as measured adaptively, or word perception, but average-readers showed better across-and within-category discrimination in the fixed-step discrimination. Individuals did not show consistent poor performance across related tasks. Conclusions:The small number of group differences, and lack of consistent poor individual performance, suggests weak support for a speech perception deficit in dyslexia. It seems likely that at least some poor performances are attributable to non-sensory factors like attention. It may also be that some individuals with dyslexia have speech perceptual acuity that is at the lower end of the normal range and exacerbated by non-sensory factors.

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Section: Discussioncontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Speech Perception Abilities of Adults With Dyslexia: Is There Any Evidence for a True Deficit?

Hazan

Messaoud‐Galusi

Rosen

et al. 2009

J Speech Lang Hear Res

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“…Here, findings are in-consistent. Some studies have demonstrated that the deficits are independent of ISI and stimulus duration (9,12,27,(38)(39)(40)(41)(42). Others, however, showed deficits exclusively for brief ISIs and stimulus durations, thus supporting the temporal-specificity hypothesis (3,23,(43)(44)(45)(46).…”

mentioning

confidence: 95%

Adults with dyslexia are impaired in categorizing speech and nonspeech sounds on the basis of temporal cues

Vandermosten

Boets

Luts

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

120

113

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Developmental dyslexia is characterized by severe reading and spelling difficulties that are persistent and resistant to the usual didactic measures and remedial efforts. It is well established that a major cause of these problems lies in poorly specified representations of speech sounds. One hypothesis states that this phonological deficit results from a more fundamental deficit in auditory processing. Despite substantial research effort, the specific nature of these auditory problems remains debated. A first controversy concerns the speech specificity of the auditory processing problems: Can they be reduced to more basic auditory processing, or are they specific to the perception of speech sounds? A second topic of debate concerns the extent to which the auditory problems are specific to the processing of rapidly changing temporal information or whether they encompass a broader range of complex spectrotemporal processing. By applying a balanced design with stimuli that were adequately controlled for acoustic complexity, we show that adults with dyslexia are specifically impaired at categorizing speech and nonspeech sounds that differ in terms of rapidly changing acoustic cues (i.e., temporal cues), but that they perform adequately when categorizing steady-state speech and nonspeech sounds. Thus, we show that individuals with dyslexia have an auditory temporal processing deficit that is not speech-specific.auditory processing | categorical perception | speech perception S peech contains a number of acoustic cues that are used to discriminate speech sounds belonging to different phonetic categories. For example, the acoustic cue that is critical for differentiating /bA/ versus /dA/, a stop consonant followed by a vowel, lies within the first 100 ms of the sounds, during which time the frequency of the second formant changes rapidly (i.e., a temporal cue). In contrast, the acoustic difference between two vowels such as /u/ versus /y/ lies in the frequency of the second formant, which stays relatively stable over time. Hence, an accurate perception of steady-state (i.e., nontemporal) spectral cues is essential for identification of these vowels. There is ample evidence that individuals with dyslexia exhibit problems in the representation of speech sounds (1), and that these may be rooted in a more fundamental auditory processing deficit (2). Originally, it was claimed that individuals with dyslexia have a deficit in processing auditory cues that are "temporal" in nature (i.e., rapidly changing), thereby causing problems in the accurate processing of rapid acoustic changes in speech (such as in stop consonants) (3). This speech perception problem was thought to consequently cause a cascade of effects, starting with the disruption of the normal development of the phonological system, eventually resulting in problems learning to read and spell. However, despite substantial research efforts, the literature is not concordant with respect to the specific nature of these auditory problems. In particular, it is unclear (i...

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“…The stimuli used were synthesised (but based on actual recordings of utterances, see van Beinum, Schwippert, Been, van Leeuwen, & Kuijpers, 2005) to create a continuum in which the F2 onset frequency is the only major spectral change. F2 is constant at 1100 Hz in / bAk/ but the onset increases in ten steps to 1800 Hz in /dAk/.…”

Section: Periodicity Measures: Harmony Of Frequency and Amplitudementioning

confidence: 99%

Classifying acoustic signals into phoneme categories: average and dyslexic readers make use of complex dynamical patterns

Hasselman

2014

Preprint

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Development and application of a /bAk/–/dAk/ continuum for testing auditory perception within the Dutch longitudinal dyslexia study

Cited by 30 publications

References 29 publications

Speech Perception Abilities of Adults With Dyslexia: Is There Any Evidence for a True Deficit?

Speech Perception Abilities of Adults With Dyslexia: Is There Any Evidence for a True Deficit?

Adults with dyslexia are impaired in categorizing speech and nonspeech sounds on the basis of temporal cues

Classifying acoustic signals into phoneme categories: average and dyslexic readers make use of complex dynamical patterns

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