Tomita H, Fujiwara K. Effects of allocation of visuo-spatial attention to visual stimuli triggering unilateral arm abduction on anticipatory postural control.
Clin Neurophysiol 2008;
119:2086-97. [PMID:
18620907 DOI:
10.1016/j.clinph.2008.05.001]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Revised: 04/10/2008] [Accepted: 05/08/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVE
We investigated the effects of allocation of visuo-spatial attention to visual stimuli triggering arm movement on anticipatory postural control.
METHODS
Fourteen healthy right-handed subjects participated in the study. Visual stimuli were randomly presented to the left or right visual field on a screen. An attention-directing cue or a non-directional cue was presented at 1000ms before visual stimulus onset. Subjects focused or divided visuo-spatial attention (focused- and divided-attention conditions, respectively) based on types of cues, and abducted the left or right arm rapidly in response to target stimuli (with 30% probability of visual stimuli) according to the side of presentation. Peak-to-peak amplitude of P1 and N1 components of event-related potentials (P1-N1 amplitude) elicited by visual stimuli and activation timing of postural muscles with respect to the middle deltoid were measured.
RESULTS
Compared with divided-attention condition, in focused-attention condition P1-N1 amplitude at occipital electrodes was enhanced and activation of the left hip abductors during right arm abduction was hastened. A significant correlation was observed between the attention-related changes in these two measurements.
CONCLUSIONS
Anticipatory postural control during right arm abduction was influenced by attention-related modulation of sensory-perceptual processing.
SIGNIFICANCE
These findings are important for understanding of the effects of visuo-spatial attention on anticipatory postural control.
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