title: Feedback about isometric force production yields more random variations.
abstract: We investigated the relation between visual feedback and the degree of structure versus randomness in the variability of single-digit, isometric force output. Participants were instructed to maintain a constant level of force during the presence or absence of visual feedback about force output. The structure of force output variability was quantified using spectral analysis and detrended fluctuation analysis. Both analyses revealed that force output was less structured (more random) when visual feedback was available than when it was not. More random performance variation seemed to reflect a corrective strategy in the control of action.
authors.affiliation: Center for Cognition, Action, & Perception, Department of Psychology, University of Cincinnati, Cincinnati, OH 45221-0376, USA.
authors.forename: Dilip N
authors.initials: DN
authors.lastname: Athreya
authors.forename: Guy
authors.initials: G
authors.lastname: Van Orden
authors.forename: Michael A
authors.initials: MA
authors.lastname: Riley
mesh_terms: D000293:Adolescent; D000328:Adult; D000465:Algorithms; D003627:Data Interpretation, Statistical; D030141:Feedback, Psychological / Q000502:physiology*; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D005385:Fingers / Q000294:innervation / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology; D014159:Transducers; D055815:Young Adult