Age-Related Changes in Motor Control During Articulator Visuomotor Tracking

Ballard, Kirrie J.; Robin, Donald A.; Woodworth, George; Zimba, Lynn D.
August 2001
Journal of Speech, Language & Hearing Research;Aug2001, Vol. 44 Issue 4, p763
Academic Journal
The present study provides normative data on changes in visuomotor control of the oral-facial system across the lifespan. Control of the lower lip, jaw, and larynx (i.e., fundamental frequency) was examined using a nonspeech visuomotor tracking (VMT) task, where subjects move the articulator of interest to track a moving target on an oscilloscope screen. This task examines articulator motor control during movements that are similar to speech but that do not impose linguistic units or the demands of coordinating multiple structures. Accuracy and within- and between-subject variability in tracking performance were measured by cross correlation, gain ratio, phase shift, and target-tracker amplitude difference. Cross-correlation analyses indicated that performance of children (aged 8;2 to 17;0 [years;months]) and older adults (aged 45;1 to 84;3) is poorer than that of younger adults (aged 17;1 to 45;0). Accuracy of movement amplitude tended to increase during development and decline with aging, whereas age did not appear to influence accuracy of temporal parameters in lip and jaw tracking. In contrast, age tended to influence individual variability in temporal but not amplitude parameters. Differences were noted between articulators. The data complement previous studies that considered accuracy and variability of articulator movement during speech. The VMT method and the data provided may be applied to assessment of impairments in the motor speech system and to differential diagnosis of motor speech versus linguistically based disorders.


Related Articles

  • Stability of Upper Face Height-Total Face Height Ratio with Increasing Age. NASJLETI, CARLOS E.; KOWALSKI, CHARLES J. // Journal of Dental Research;Nov1975, Vol. 54 Issue 6, p1241 

    The article presents a study which examined the effects of aging on the ratio of upper facial height to total facial height, focusing on the stability of this ratio throughout the third through fifth decades of life. The author mentions that total face height is measured as the distance from the...

  • Longest-Living Mammals.  // Scholastic News -- Senior Edition;09/25/2000, Vol. 69 Issue 4, p3 

    Presents a graphical representation of the average life spans of long-living mammals.

  • Longest-Living Mammals.  // Scholastic News -- Edition 4;09/25/2000, Vol. 63 Issue 4, p3 

    Presents a graphical representation of the average life spans of long-living mammals.

  • Can we stay young? Kluger, Jeffrey; Lafferty, Elaine // Time International (South Pacific Edition);11/25/96, Issue 48, p70 

    Examines how scientists are starting to unlock the mysteries of aging and how we may be able to prevent it. Possibility that researchers may one day not only lengthen life-spans but improve them as well; Historic changes in life expectancy; Research into the cellular-damage model of aging;...

  • Mutant Models of Prolonged Life Span. Mahler, Joel F. // Toxicologic Pathology;Nov/Dec2001, Vol. 29 Issue 6, p673 

    Aging is an important biological process that affects all creatures. For humans, age-related diseases and the question of why we age and die also have tremendous social and philosophical impact. We can therefore expect that models to study mechanisms of the aging process will always attract much...

  • Extending the Human Life Span. Glannon, Walter // Journal of Medicine & Philosophy;Jun2002, Vol. 27 Issue 3, p339 

    Research into the mechanisms of aging has suggested the possibility of extending the human life span. But there may be evolutionary biological reasons for senescence and the limits of the cell cycle that explain the infirmities of aging and the eventual demise of all human organisms. Genetic...

  • Does Having Children Extend Life Span? A Genealogical Study of Parity and Longevity in the Amish. McArdle, Patrick F.; Pollin, Toni I.; O'Connell, Jeffrey R.; Sorkin, John D.; Agarwala, Richa; Schaefer, Alejandro A.; Streeten, Elizabeth A.; King, Terri M.; Shuldiner, Alan R.; Mitchell, Braxton D. // Journals of Gerontology Series A: Biological Sciences & Medical ;Feb2006, Vol. 61 Issue 2, p190 

    Background. The relationship between parity and life span is uncertain, with evidence of both positive and negative relationships being reported previously. We evaluated this issue by using genealogical data from an Old Order Amish community in Lancaster, Pennsylvania. a population characterized...

  • An Analysis of the Relationship Between Metabolism, Developmental Schedules, and Longevity Using Phylogenetic Independent Contrasts. De Magalhães, João Pedro; Costa, Joana; Church, George M. // Journals of Gerontology Series A: Biological Sciences & Medical ;Feb2007, Vol. 62 Issue 2, p149 

    Comparative studies of aging are often difficult to interpret because of the different factors that tend to correlate with longevity. We used the AnAge database to study these factors, particularly metabolism and developmental schedules, previously associated with longevity in vertebrate...

  • Scientists Achieve Record Extension of Life Span in Simple Organism. Dye, Dayna // Life Extension;May2008, Vol. 14 Issue 5, p21 

    The article presents a study that shows the effect of combining knocked out genes and dietary restriction on the lifespan of a baker's yeast. The organism is allowed to live 10 times longer than its normal life span. Scientists knock out RAS2 and SCH9 genes that have been found to promote cancer...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics