title: Aging effects on sensorimotor integration: a comparison of effector systems and feedback modalities.
abstract: Research on motor aging has focused on visuomotor effects in limb musculature, with few comparisons across effectors or feedback modalities. The authors examined steady fine force control in oral and manual effectors under visual and auditory feedback in 13 young (19-23 years old) and 13 older (60-77 years old) participants, hypothesizing that force variability would increase with aging (a) more in the finger than the lip and (b) for both feedback modalities. The magnitude of variability increased with age for both visuomotor and audiomotor tasks but age-related differences were greater in the lip than the finger. These results point to increased variability as a potential early marker of changing motor function (prior to loss of strength) that extends beyond the visuomotor system.
authors.affiliation: Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, IL 61820, USA. tloucks@illinois.edu
authors.forename: Christina R
authors.initials: CR
authors.lastname: Bronson-Lowe
authors.forename: Torrey M
authors.initials: TM
authors.lastname: Loucks
authors.forename: Edward
authors.initials: E
authors.lastname: Ofori
authors.forename: Jacob J
authors.initials: JJ
authors.lastname: Sosnoff
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology*; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*; D055815:Young Adult