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Dive into the research topics where Roger D. Colcord is active.

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Featured researches published by Roger D. Colcord.


Perceptual and Motor Skills | 1993

VOICE ONSET TIME OF VELAR STOP PRODUCTIONS IN AGED SPEAKERS

Linda Petrosino; Roger D. Colcord; Karen B. Kurcz; Robert J. Yonker

Voice onset time (VOT) was measured for voiced and voiceless velar stop consonants across three vowel contexts (/i, a, u/) in healthy young adult and older subjects. Analysis showed that mean VOT values for both /k/ and /g/ across the three vowel contexts did not differ between the two groups; however, differences in VOT variability (standard deviation) approached significance; the older subjects exhibited increased variability. This apparent increase in variability may be related to the subtle anatomical and physiological changes with age.


Folia Phoniatrica Et Logopaedica | 1996

Age-related differences in acoustical aspects of contrastive stress in women.

Gail P. Scukanec; Linda Petrosino; Roger D. Colcord

The purpose of this investigation was to compare the fundamental frequency (F0), durational, and sound pressure characteristics of speech during production of contrastive stress, a suprasegmental component of speech, in young adult and elderly women. Results indicate that, while both groups significantly increased F0, duration, and sound pressure level during production of contrastive stress, elderly women increased F0 to a significantly greater extent than young women and, for all acoustic parameters, the groups were dissimilar in position effects. In spite of the age related differences, such differences did not appear to limit the ability of elderly women to provide linguistic information through prosody. However, they may do so differently from young women. These findings may have implications in terms of treatment of speech disorders in the elderly.


Perceptual and Motor Skills | 2001

Differential vowel duration associated with children's word-final fricative deletion.

Leslie S. Plonsker; Linda Petrosino; Roger D. Colcord

This study assessed whether 3 children, 5 to 6 years old, who deleted word-final fricatives preserve the voicing contrast for those fricatives by producing differential duration of the preceding vowel. The childrens CV syllable productions were compared to their CV(C) syllable productions in which the final consonant was intended but actually deleted. Analysis indicated that all 3 children exhibited significantly longer vowel duration in CV syllables than in CV(C) syllables. This differential duration of the preceding vowel was shown in both isolation and carrier phrase conditions. Of the 3 children 2 preserved the voicing contrast by showing significantly longer vowels preceding voiced consonants as compared to voiceless consonants. One child did this in both isolation and carrier phrase conditions and the other child did this in isolation only. All 3 children manipulated vowel duration to signify the linguistic contrast, therefore these findings support a linguistic perspective of speech development which focuses on the acquisition and knowledge of the linguistic rules of the language. In addition, the large amount of variability in vowel duration for CV and CV(C) syllables and the marked variability in performance across children support a biological view of a developing vocal tract undergoing structural and physiological changes.


Perceptual and Motor Skills | 1986

Effects of auditory masking by white noise on primary stressing during spontaneous speech

Roger D. Colcord; Catherine Loren; Michael P. Rastatter

6 adult subjects (3 men, 3 women) produced highly similar spontaneous speech utterances in quiet and with 90-dB SPL white noise. The frequency of occurrence of perceptual judgments of primary stressing in an utterance was not affected by the masking noise. This finding supplements our previous report that variability for stress production of fundamental frequency (fo) during spontaneous speech was preserved under short-term auditory disruption. Also, it adds further support to the contention that fo is under open-loop regulation.


Perceptual and Motor Skills | 1986

Time Compression and Spectral Characteristics of Phonemes

Marie M. Watson; Michael P. Rastatter; Roger D. Colcord

The present study compared spectral characteristics of the test phonemes of Subtest 13 of Auditory-Visual Abilities Test produced at a normal rate and a 50% time-compression. Results showed marked damping of high frequency energy above 3000 Hz, a by-product of the instrumentation.


Perceptual and Motor Skills | 2002

Self-reported anxiety of adults who do and do not stutter.

Rodney Gabel; Roger D. Colcord; Linda Petrosino


Journal of Fluency Disorders | 1987

Visual coding strategies and hemisphere dominance characteristics of stutterers

Michael P. Rastatter; Catherine Loren; Roger D. Colcord


Perceptual and Motor Skills | 1986

Effects of Auditory Masking by White Noise on Variability of Fundamental Frequency during Highly Similar Productions of Spontaneous Speech

Catherine Loren; Roger D. Colcord; Michael P. Rastatter


Journal of Fluency Disorders | 1987

Perceptual analyses of stuttering and nonstuttering children's fluent speech productions☆

Roger D. Colcord; Hugo H. Gregory


Perceptual and Motor Skills | 2001

A Study of the Self-Talk of Adults Who Do and Do Not Stutter

Rodney M. Gabel; Roger D. Colcord; Linda Petrosino

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Linda Petrosino

Bowling Green State University

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Michael P. Rastatter

Bowling Green State University

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Gail P. Scukanec

Central Michigan University

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Leslie S. Plonsker

University of Wisconsin–Stevens Point

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Marie M. Watson

Bowling Green State University

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Rodney Gabel

Bowling Green State University

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Rodney M. Gabel

University of Wisconsin–Stevens Point

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