動体視力に対する左右方向の受動的頭部直線運動の効果 Effects of Interaural Passive Head Translation on Dynamic Visual Acuity

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To clarify the effect of head motion on dynamic visual acuity (DVA), we analyzed the relationship between DVA and eye movements during sinusoidal passive head translation at 0.6-1.4 Hz (amplitude: 5 cm) along the inter-aural axis using our original linear sled. Five healthy subjects were asked to read aloud sets of three numbers presented on a CRT monitor at a 30 cm distance that moved sinusoidally at the same frequency (amplitude: 7.5 cm) in the opposite direction to the head. We evaluated the percentage of correct answers as an index of DVA. For comparison, control experiments were conducted while the head was stationary. The main results showed that DVA improved significantly during head translation compared to when the head was stationary at 1.4 Hz (paired t-test, p<0.05). Although head translation did not affect DVA at 0.6-1.2 Hz. At 1.4 Hz, the vestibuloocular reflex evoked by head translation increased tracking gain, decreased phase-lag, and suppressed catch-up saccades. Consequently, gaze velocity (eye velocity in space) was bigger with head translation versus a stationary head. In addition, we identified another DVA-determining factor that was independent of head translation and eye movements. We consider that these composite factors improve DVA during higher-frequency head translation.

収録刊行物

  • Equilibrium research  

    Equilibrium research 65(4), 229-237, 2006-08-01 

    Japan Society for Equilibrium Research

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各種コード

  • NII論文ID(NAID)
    10021289514
  • NII書誌ID(NCID)
    AN00001485
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03855716
  • データ提供元
    CJP書誌  J-STAGE 
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