Rodolfo Sommers

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The purpose of this study was to investigate the effects of speed and cognitive stress on the articulatory coordination abilities of adults who stutter. Cardiovascular (heart rate, systolic blood pressure, and diastolic blood pressure), behavioral (dysfluencies, errors, speech rate, and response latency), and acoustic (word duration, vowel duration,(More)
39 stutterers and 39 normal speakers indicated their ear preferences for dichotically presented words and digits. A single response mode for both dichotic words and digits was selected to study speech perception. Stutterers showed significantly less of the normal right-ear preference for dichotic words and digits than non-stutterers. The proportion of(More)
Nonspeech and speech auditory processing skills as well as internal speech processing skills were assessed among four patients with acquired "pure" apraxia of speech, 10 with acquired aphasia, 10 with aphasia plus apraxia of speech, and 11 neurologically normal adults. Fourteen tasks were administered and performances on 68 variables were examined using(More)
Researchers describe Mandarin Chinese tone phonemes by their fundamental frequency (Fo) contours. However, tone phonemes are also comprised of higher harmonics that also may cue tone phonemes. We measured identification thresholds of acoustically filtered tone phonemes and found that higher harmonics, including resolved harmonics above the Fo and unresolved(More)
Relationships between the fine motor skills and linguistic abilities of 37 developmentally delayed children, ages 5 to 9 yr., were studied using a battery of expressive and receptive language tests, a measure of fine motor performance, a dichotic listening test, and individual intelligence tests. While IQs and MAs were not related to fine motor skills, both(More)
A dichotic word task was used to contrast the speech-perceptual functioning of two groups of Down's syndrome children having qualitatively different speech and language skills to that of nonretarded subjects. Although the 20 nonretarded subjects showed an average 23% right-ear effect on the task, the average ear effect for 29 Down's syndrome subjects was(More)
This article contains a summary of aspects of research designs and strategies found in 63 published reports in which the effectiveness of treatment of articulation or phonological disorders was evaluated. These research reports were published in four nationally refereed journals that contained most of the literature published in the decades of the 1970s and(More)