Perceptual organization of speech signals by children with and without dyslexia.
Kids with dyslexia struggle to organize broken speech, and that auditory weakness predicts their reading and phoneme skills.
01Research in Context
What this study did
Ni Chuileann et al. (2013) asked kids to listen to two kinds of messy speech. One kind sounded like a robot talking through a kazoo. The other kind sounded like whispers in a wind tunnel.
The team tested children with dyslexia and children who read on grade level. They wanted to see who could still understand the words when the sound signal was broken.
What they found
Kids with dyslexia named far fewer sentences correctly than their peers. The gap showed up on both the robot speech and the whispery speech.
Poor scores on the messy-speech task lined up with poor scores on reading tests and phoneme games. The worse the ear could organize sound, the worse the eye could organize print.
How this fits with other research
Foti et al. (2015) looked at dozens of studies and found the same wide pattern: reading disabilities drag down memory, attention, and executive skills. Susan’s small study adds a new brick to that wall by pointing to low-level sound coding as one starting point.
Duerden et al. (2012) gives hope. They ran nine short computer lessons that trained French kids with SLI to tell similar sounds apart. After only six total hours, voicing perception and phonological awareness jumped. The result shows the auditory weakness Susan found is trainable, at least in SLI.
Irwin et al. (2022) seems to disagree at first glance. They report that kids with autism ignore the speaker’s face and rely on raw sound. Susan’s kids with dyslexia, however, can’t organize the raw sound even when the face is absent. Different diagnoses, different weak spots: autism under-uses vision, dyslexia garbles audition.
Why it matters
If a learner’s reading is stuck, test how they hear noisy speech, not just clear phonics lists. Quick robot-speech or whisper-sentence tasks can flag kids who need stronger auditory training before decoding lessons will stick. Pair future phonics drills with brief sound-discrimination games like the ones G et al. used. Six hours may be enough to sharpen the ear so the reading brain can finally map letters to sounds.
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02At a glance
03Original abstract
Developmental dyslexia is a condition in which children encounter difficulty learning to read in spite of adequate instruction. Although considerable effort has been expended trying to identify the source of the problem, no single solution has been agreed upon. The current study explored a new hypothesis, that developmental dyslexia may be due to faulty perceptual organization of linguistically relevant sensory input. To test that idea, sentence-length speech signals were processed to create either sine-wave or noise-vocoded analogs. Seventy children between 8 and 11 years of age, with and without dyslexia participated. Children with dyslexia were selected to have phonological awareness deficits, although those without such deficits were retained in the study. The processed sentences were presented for recognition, and measures of reading, phonological awareness, and expressive vocabulary were collected. Results showed that children with dyslexia, regardless of phonological subtype, had poorer recognition scores than children without dyslexia for both kinds of degraded sentences. Older children with dyslexia recognized the sine-wave sentences better than younger children with dyslexia, but no such effect of age was found for the vocoded materials. Recognition scores were used as predictor variables in regression analyses with reading, phonological awareness, and vocabulary measures used as dependent variables. Scores for both sorts of sentence materials were strong predictors of performance on all three dependent measures when all children were included, but only performance for the sine-wave materials explained significant proportions of variance when only children with dyslexia were included. Finally, matching young, typical readers with older children with dyslexia on reading abilities did not mitigate the group difference in recognition of vocoded sentences. Conclusions were that children with dyslexia have difficulty organizing linguistically relevant sensory input, but learn to do so for the structure preserved by sine-wave signals before they do so for other sorts of signal structure. These perceptual organization deficits could account for difficulties acquiring refined linguistic representations, including those of a phonological nature, although ramifications are different across affected children.
Research in developmental disabilities, 2013 · doi:10.1017/S0142716412000410