Papers by Michael Rastatter
Language Speech and Hearing Services in Schools, 1984
This investigation studied the effects of two forms of rhinological disorders on the relative amp... more This investigation studied the effects of two forms of rhinological disorders on the relative amplitude and time characteristics of the /m/, /n/, and // phonemes. Results showed that the temporal characteristics and performance variability associated with the production of the nasal sounds were within normal limits for the denasal subjects, whereas relative amplitude changes occurring across the V nasal V waveforms were significantly greater for the denasal speakers. These results suggest that true stop/nasal articulatory substitutions do not actually occur in the speech of denasal speakers. Clinical implications are discussed.
Perceptual and Motor Skills, 1986
Syntactic decoding reaction times of 20 learning disabled children comprising two groups of subje... more Syntactic decoding reaction times of 20 learning disabled children comprising two groups of subjects (mean age of 8 and 13 yr., respectively) were compared to the responses of normal controls matched for age and sex. An analysis of variance procedure showed that the learning disabled children and their normal peers did not differ significantly in responses to the experimental stimuli. This held true regardless of linguistic complexity, suggesting that delays in processing elementary syntactic constructions are not a concomitant of learning disabilities.
Journal of Fluency Disorders, 1997
The purpose of this study was to investigate the effects of various environmental conditions unde... more The purpose of this study was to investigate the effects of various environmental conditions under non-altered feedback (NAF) and frequency-altered feedback (FAF) on stuttering frequency. Eight adults who stutter read aloud under three conditions of NAF and identical conditions of FAF. In one experimental condition, the participant read aloud while alone unaware of a concealed microphone. In a second condition, the participant read aloud while alone with a video camera conspicuously recording the task. A third condition had participants read aloud with two observers and with a video camera conspicuously recording the task. Results showed that stuttering frequency was significantly greater while reading aloud with NAF compared to the three conditions of FAF. Significant differences in stuttering frequency did not occur between the three NAF conditions or between the three FAF conditions. It appears that stuttering is not as susceptible to operant environments, as previously proposed.
Journal of speech and hearing …, 1990
The present study investigated the effects of advanced aging on hemispheric organization for visu... more The present study investigated the effects of advanced aging on hemispheric organization for visual-linguistic processing. Lexical decision vocal-reaction times of geriatric subjects were measured for unilaterally presented concrete and abstract nouns in an attempt to obtain an index of differential left and right hemispheric processing ability. Results of an ANOVA procedure showed that reaction times were significantly faster when subjects were presented the stimulus items in their right visual fields, regardless of whether the item was a concrete or abstract word. An ANOVA procedure applied to the arcsine of the percentages of occurrence of false-positive and false-negative error types showed a significant interaction between the error type and visual field variables. Post hoc tests showed left visual field, false-positive errors occurred significantly more often than the remaining visual field, error type configurations. Finally, for the reaction time data, a significant correlation existed between the two visual fields for the concrete and abstract items. Collectively, such findings were consistent with a callosal relay model of neurolinguistic organization, suggesting that the right hemisphere's ability to perform lexical decisions was diminished in the present group of elderly subjects.
Learning Disabilities Research, 1990
Journal of fluency disorders, 1988
The present study measured plasma levels of epinephrine, norepinephrine, dopamine, and primary am... more The present study measured plasma levels of epinephrine, norepinephrine, dopamine, and primary amino acids of five stutterers employing state-of-the-art high performance liquid chromatographic technology. Pertinent findings showed that glutamine levels of all five subjects were more than four standard deviation units higher than the reference mean, which was interpreted as reflecting a possible increase in left hemispheric GABAergic activity. When considered within the parameters of a reciprocal interhemispheric neurotransmitter balance theory, such findings may well suggest that neurotransmitter ratios between and within the two hemispheres are aberrant in the stuttering population. A theoretical model is presented elucidating these disturbed relationships and their possible influence on speech fluency.
American Journal of Speech-Language Pathology, 2000
Language Speech and Hearing Services in Schools, 1982
Language Speech and Hearing Services in Schools, 1984
Journal of Speech and Hearing Research, Jul 1, 1987
The purpose of the current study was to investigate the effects of advanced aging on hemispheric ... more The purpose of the current study was to investigate the effects of advanced aging on hemispheric organization for linguistic processing. Specifically, it was an attempt to identify whether the neurological substrate responsible for right-hemispheric language analysis diminishes in function. Measures of the influence on reaction time of the hand used to respond versus the hemisphere stimulated were obtained for a geriatric sample in an attempt to obtain an index of right-versus left-hemisphere auditory-verbal processing ability. Twenty-four right-handed geriatric subjects responded to monaurally presented verbal stimuli with their right and left hands at separate times. Reaction times were significantly faster when subjects heard the words in their right ears, regardless of the hand used to respond. Such findings were consistent with a strict model of neurolinguistic organization that suggests that the left hemisphere was responsible solely for language processing in the present group of elderly subjects. Compared to data previously gathered for young subjects, the current findings were interpreted to suggest that right-hemispheric language processing ability is inhibited in the more advanced stages of life.
Folia phoniatrica, 1990
... Titre du document / Document title. Formant frequency structure of the aging male and female ... more ... Titre du document / Document title. Formant frequency structure of the aging male and female vocal tract. Auteur(s) / Author(s). RASTATTER MP ; JACQUES RD ; Affiliation(s) du ou des auteurs / Author(s) Affiliation(s). Bowling green state univ., dep. ...
Journal of speech and hearing research, 1987
The purpose of the current study was to investigate the effects of advanced aging on hemispheric ... more The purpose of the current study was to investigate the effects of advanced aging on hemispheric organization for linguistic processing. Specifically, it was an attempt to identify whether the neurological substrate responsible for right-hemispheric language analysis diminishes in function. Measures of the influence on reaction time of the hand used to respond versus the hemisphere stimulated were obtained for a geriatric sample in an attempt to obtain an index of right-versus left-hemisphere auditory-verbal processing ability. Twenty-four right-handed geriatric subjects responded to monaurally presented verbal stimuli with their right and left hands at separate times. Reaction times were significantly faster when subjects heard the words in their right ears, regardless of the hand used to respond. Such findings were consistent with a strict model of neurolinguistic organization that suggests that the left hemisphere was responsible solely for language processing in the present grou...
Perspectives on Administration and Supervision, 2003
Perceptual and Motor Skills, 1984
The peak amplitude of EMG activity was measured from the orbicularis oris superior, orbicularis o... more The peak amplitude of EMG activity was measured from the orbicularis oris superior, orbicularis oris inferior, and masseter muscles of 3 mild and 3 moderately articulatory disordered and 3 normal boys repeating a series of /p ae/ syllable trains with the jaw fixed. Analysis showed similar levels of peak EMG amplitude and variability of performance for all subjects across the three muscles. These data were interpreted to suggest that speech-motor equivalence for simple articulatory acts requiring compensation is functioning within normal limits for the disordered subjects studied here.
Perceptual and Motor Skills, 1986
Three groups of women, of mean age 21, 72, and 84 yr. (ns = 34, 17, 17), were tape-recorded while... more Three groups of women, of mean age 21, 72, and 84 yr. (ns = 34, 17, 17), were tape-recorded while describing the "Cookie Thief" picture of the Boston Diagnostic Aphasia Test. Voice fundamental frequency (fo) was measured for a 30-sec. sample from the middle of their descriptions. Analysis showed that the two elderly groups' mean fo was significantly lower than the younger females', but no differences between means were significant for the older groups. Similar findings were obtained for variability of performance. Also, the older groups were more restricted in their vocal maneuvering below their average fo. Compared to past findings showing greater fo variability during reading, the current data suggest that the magnitude of variability of fo in elderly women is dependent upon both the vocal parameters measured and the method used to obtain the data.
Perceptual and Motor Skills, 1988
The current study investigated the capacity of the right hemisphere to process verbs using a para... more The current study investigated the capacity of the right hemisphere to process verbs using a paradigm proven reliable for predicting differential, minor hemisphere lexical analysis in the normal, intact brain. Vocal reaction times of normal subjects were measured to unilaterally presented verbs of high and of low frequency. A significant interaction was noted between the stimulus items and visual fields. Post hoc tests showed that vocal reaction times to verbs of high frequency were significantly faster following right visual-field presentations (right hemisphere). No significant differences in vocal reaction time occurred between the two visual fields for the verbs of low frequency. Also, significant differences were observed between the two types of verbs following left visual-field presentation but not the right. These results were interpreted to suggest that right-hemispheric analysis was restricted to the verbs of high frequency in the presence of a dominant left hemisphere.
Perceptual and Motor Skills, 1989
Lexical decision vocal reaction times (RT) were obtained for a group of Chinese subjects to unila... more Lexical decision vocal reaction times (RT) were obtained for a group of Chinese subjects to unilateral tachistoscopically presented pictorial, single, and combination Chinese characters. The RT showed a significant right visual-field advantage, with significant correlations of performance between the visual fields for each type of character. Error analysis gave a significant interaction between visual fields and error type--significantly more false positive errors occurred following left visual-field inputs. These results suggest that the left hemisphere was responsible for processing each type of character, possibly reflecting superior postaccess lexical-decision processes.
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Papers by Michael Rastatter