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

IF 5 2区 医学 Q1 OPHTHALMOLOGY Investigative ophthalmology & visual science Pub Date : 2024-10-01 DOI:10.1167/iovs.65.12.36
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.

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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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