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特殊教育学研究 >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/2241/113940
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| Title: | 弱視者の滑動性眼球運動の特性 |
| Other Titles: | Characteristics of Smooth Pursuit Eye Movements in Persons with Partial Sight |
| Authors: | 柿沢, 敏文
中田, 英雄
谷村, 裕
Kakizawa, Toshibumi
Nakata, Hideo
カキザワ, トシブミ
ナカタ, ヒデオ |
| Issue Date: | Mar-1989 |
| Publisher: | 日本特殊教育学会 |
| Journal Title: | 特殊教育学研究 |
| Volume: | 26 |
| Issue: | 4 |
| Start Page: | 11 |
| End Page: | 19 |
| Abstract: | 弱視者11名と晴眼者6名の滑動性眼球運動をEOG法(DC記録)を用いて測定した。被検者の眼前50cmあるいは100cmに、視角±10°で正弦波状に0.2Hzから1.45Hzまで5段階の周波数で水平方向に移動する視標を配置した。視標の追視によって生じる眼球運動のEOGをコンピュータ分析し、振幅比、位相角および時間ずれを求めた。その結果、晴眼者は視標の周波数が大になると振幅比と位相角の値が徐々に低下した。時間ずれはいずれの周波数の視標に対してもほぼ一定の値を示した。弱視者の振幅比と位相角の値は視標が比較的低周波数の段階で急激に低下した。時間ずれは視標が高周波数になるとともに大となった。また、弱視者は顕著な個人差が認められた。これらの結果から、弱視者は視標が比較的低周波数の段階で滑動性眼球運動の調節が限界に達すること、視標を中心窩ではなく網膜の周辺部で捕えていること、滑動性眼球運動の調節の時間的側面に問題があることがわかった。
Smooth pursuit eye movements were binocularly recorded with DC-electrooculography (EOG) in 6 subjects with sight and 11 subjects with partial sight. The pursuit target was a lightemitting diode (LED), located either 0.5m. or 1.0m. from the subject. The target moved sinusoidally in the horizontal plane at frequencies of 0.2, 0.36, 0.78, 1.2, and 1.45Hz. The peak amplitude of the stimulus was maintained at 10° (20° peak-to-peak). A headrest and dental bite board prevented subjects from making any head movements. Subjects were asked to track the movement of the stimulus as accurately as possible. With a computer, quantitative measures of gain, phase, and time lag were obtained by cross-power spectrum analysis of the stimulus input and eye-movement output. Data from subjects with sight showed gains close to 1.0 and phase shifts around 0° at 0.2Hz., 0.36Hz., and 0.78Hz. With increasing stimulus frequency, a gradual and slight decrease in gain and phase appeared in subjects with sight. It was found that subjects with partial sight could track a target moving at relatively slow stimulus frequencies; 0.2Hz. and 0.36Hz. They showed rapid decrements in gain, phase, and time lag at 0.78Hz. A one-way ANOVA showed no main effect of stimulus frequency in time lag for subjects with sight. In addition, there was greater variability in gain, phase, and time lag for persons with partial sight. It was concluded that the subjects with partial sight could track a moving object only poorly. However, the tracking performance of some of them was similar to that of persons with sight. Thus, given a well-designed perceptual and motor program, the oculomotor skills of persons with partial sight could be developed. |
| URI: | http://hdl.handle.net/2241/113940 |
| Rights: | 日本特殊教育学会
本文データは学協会の許諾に基づきCiNiiから複製したものである |
| Text Version: | publisher |
| Appears in Collections: | 柿澤 敏文 (Kakizawa Toshibumi)
中田 英雄 (Nakata Hideo)
特殊教育学研究
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