Factors Affecting Stimulus Duration Threshold for Depth Discrimination of Asynchronous Targets in the Intermediate Distance Range.

IF 5 2区 医学 Q1 OPHTHALMOLOGY
Yiya Chen, Zijiang J He, Teng Leng Ooi
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Abstract

Purpose: Binocular depth discrimination in the near distance range (< 2 m) improves with stimulus duration. However, whether the same response-pattern holds in the intermediate distance range (approximately 2-25 m) remains unknown because the spatial coding mechanisms are thought to be different.

Methods: We used the two-interval forced choice procedure to measure absolute depth discrimination of paired asynchronous targets (3, 6, or 16 arc min). The paired targets (0.2 degrees) were located over a distance and height range, respectively, of 4.5 to 7.0 m and 0.15 to 0.7 m. Experiment 1 estimated duration thresholds for binocular depth discrimination at varying target durations (40-1610 ms), in the presence of a 2 × 6 array of parallel texture-elements spanning 1.5 × 5.83 m on the floor. The texture-elements provided a visible background in the light-tight room (9 × 3 m). Experiment 2 used a similar setup to control for viewing conditions: binocular versus monocular and with versus without texture background. Experiment 3 compared binocular depth discrimination between brief (40, 80, and 125 ms) and continuous texture background presentation.

Results: Stimulus duration threshold for depth discrimination decreased with increasing disparity in experiment 1. Experiment 2 revealed depth discrimination performance with texture background was near chance level with monocular viewing. Performance with binocular viewing degraded without texture background. Experiment 3 showed continuous texture background presentation enhances binocular depth discrimination.

Conclusions: Absolute depth discrimination improves with target duration, binocular viewing, and texture background. Performance further improved with longer background duration underscoring the role of ground surface representation in spatial coding.

影响中距离范围内异步目标深度辨别的刺激持续时间阈值的因素。
目的:近距离(< 2 m)的双眼深度辨别能力会随着刺激持续时间的延长而提高。然而,由于空间编码机制被认为是不同的,因此在中距离范围(约 2-25 米)是否也存在同样的反应模式仍是未知数:方法:我们使用双间隔强迫选择程序来测量配对异步目标(3、6 或 16 弧分)的绝对深度辨别力。实验 1 估计了在不同目标持续时间(40-1610 毫秒)下的双目深度辨别持续时间阈值,当时地板上有一个 2 × 6 的平行纹理元素阵列,跨度为 1.5 × 5.83 米。纹理元素在光线密闭的房间(9 × 3 米)中提供了可见背景。实验 2 采用了类似的设置来控制观察条件:双目与单目,有纹理背景与无纹理背景。实验 3 比较了短暂(40、80 和 125 毫秒)和连续纹理背景呈现时的双眼深度辨别能力:结果:在实验 1 中,深度辨别的刺激持续时间阈值随着悬殊度的增加而降低。实验 2 显示,单眼观看时,纹理背景的深度辨别能力接近偶然水平。在没有纹理背景的情况下,双目观看时的表现则有所下降。实验 3 显示,连续的纹理背景呈现会增强双眼的深度辨别能力:结论:绝对深度辨别力会随着目标持续时间、双目观看和纹理背景而提高。结论:绝对深度辨别力随着目标持续时间、双目观看和纹理背景的增加而提高,随着背景持续时间的延长,表现进一步提高,这强调了地表表征在空间编码中的作用。
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来源期刊
CiteScore
6.90
自引率
4.50%
发文量
339
审稿时长
1 months
期刊介绍: Investigative Ophthalmology & Visual Science (IOVS), published as ready online, is a peer-reviewed academic journal of the Association for Research in Vision and Ophthalmology (ARVO). IOVS features original research, mostly pertaining to clinical and laboratory ophthalmology and vision research in general.
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