title: Effects of attentional dispersion on sensory-motor processing of anticipatory postural control during unilateral arm abduction.
abstract: OBJECTIVE
  We investigated effects of attentional dispersion on sensory-motor processing of anticipatory postural control during unilateral arm abduction.
  
  
  METHODS
  Thirteen adults performed arm abduction under two types of attentional dispersion conditions. A target stimulus was presented with 30% probability in two- or three-positions. By cue signal presentation, subjects either focused their attention on one position or divided attention for two or three positions and abducted right arm for target stimulus. Event-related potentials and onset time of postural muscles were measured.
  
  
  RESULTS
  P1-N1 and N2 amplitudes decreased with attentional dispersion in both conditions, but P3 did not change. With attentional dispersion to three-positions, N2 latency increased and start of late CNV was delayed, and also the onset time of gluteus medius was late in correlation to the late CNV changings, with no changings in two-positions.
  
  
  CONCLUSIONS
  With attentional dispersion, brain activation decreased in the area related to the sensory processing and especially in the stimulus discrimination area. With increasing attentional dispersion, the delay in motor preparation or anticipatory attention to target stimuli was related to the delay in stimulus discrimination and onset time of postural muscle activation.
  
  
  CONCLUSIONS
  Effects of attentional dispersion on sensory-motor processing of anticipatory postural control were experimentally demonstrated.
authors: Department of Physical Therapy, Faculty of Human Science, Hokkaido Bunkyo University, 5-196-1 Kogane-chuo, Eniwa 061-1449, Japan.
authors: Chie
authors: C
authors: Yaguchi
authors: Katsuo
authors: K
authors: Fujiwara
mesh_terms: D000328:Adult; D059031:Anticipation, Psychological / Q000502:physiology*; D001132:Arm / Q000502:physiology*; D001288:Attention / Q000502:physiology*; D003071:Cognition / Q000502:physiology; D003463:Cues; D004576:Electromyography; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D010465:Perception / Q000502:physiology; D011187:Posture / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*