180 Participants Needed

Visual Stimuli for Space Perception in Vision

ZH
Overseen ByZijiang He, Ph.D.
Age: 18 - 65
Sex: Any
Trial Phase: Academic
Sponsor: University of Louisville
No Placebo GroupAll trial participants will receive the active study treatment (no placebo)

What You Need to Know Before You Apply

What is the purpose of this trial?

The ability to judge the locations of various objects from oneself during self-motion in the intermediate distance range (\~2-25m) is crucial for successful performance of activities of daily living, such as walking and driving. However, little is known about the mechanisms of visual space perception involved in judging distance, the focus of this project, in the planning and/or execution of self-motion in the natural 3D environment. The theoretical knowledge to be gained from this project will contribute to the scientific literature and provide insights into how eye and neurological defects could impair visual space perception, wayfinding, and mobility.

Will I have to stop taking my current medications?

The trial information does not specify whether you need to stop taking your current medications.

How is the Visual Stimuli for Space Perception treatment different from other treatments for space perception issues?

This treatment is unique because it uses visual stimuli to enhance depth perception and spatial awareness by exploiting both classical binocular disparity and unmatched visual cues, which are not typically addressed by other treatments.12345

What data supports the effectiveness of the treatment Visual Stimuli for Space Perception in improving spatial awareness?

Research shows that perceived depth, defined by visual cues, enhances the precision of visual processing for objects perceived as closer, which suggests that visual stimuli can improve spatial awareness by helping people better judge object size and location.36789

Who Is on the Research Team?

ZH

Zijiang He, Ph.D.

Principal Investigator

University of Louisville

Are You a Good Fit for This Trial?

This trial is for adults and children over 18 with good stereo vision (sharp depth perception) and normal or corrected-to-normal eyesight. It's not suitable for those with physical movement issues, pregnant women due to the time needed, or anyone with a history of eye diseases.

Inclusion Criteria

I am 40 years old or younger.
My vision is 20/20, with or without correction.
Stereo acuity less than 20 arc sec

Exclusion Criteria

I have a history of eye problems.
I have limitations in my physical movements.
Vulnerable populations such as pregnant women will be excluded owing to the extensive time commitment required of the subjects.

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

2-4 weeks

Experimental Procedure

Participants judge perceived distances and heights of test targets before and after self-motion to assess visual space perception.

1 day
1 visit (in-person)

Follow-up

Participants are monitored for any changes in visual perception and cognitive processes after the experimental procedure.

4 weeks

What Are the Treatments Tested in This Trial?

Interventions

  • Visual Stimuli for Space Perception
Trial Overview The study tests how well people can judge the location of objects at intermediate distances while moving. Participants will be exposed to visual stimuli that challenge their space perception in a controlled three-dimensional environment.
How Is the Trial Designed?
1Treatment groups
Experimental Treatment
Group I: Visual scencesExperimental Treatment1 Intervention
Lit target locations in visual environment will be varied and subjects' perceived locations will be measured.

Find a Clinic Near You

Who Is Running the Clinical Trial?

University of Louisville

Lead Sponsor

Trials
353
Recruited
76,400+

National Eye Institute (NEI)

Collaborator

Trials
572
Recruited
1,320,000+

Published Research Related to This Trial

Perceived depth significantly enhances the precision of visual judgments, with size discrimination being more accurate for objects perceived as closer to the observer, as shown in a series of experiments.
This 'close advantage' extends beyond basic tasks, improving performance in more complex perceptual tasks like face perception, indicating that depth perception plays a crucial role in various visual processing scenarios.
Perceived depth modulates perceptual resolution.Ahsan, T., Bolton, K., Wilcox, LM., et al.[2022]
Distance judgments for floor-level objects can be made more accurately when multiple objects are present, as the relative positions provide additional information, regardless of the viewing duration.
Older observers benefit from prior visual experience, as longer viewing times in earlier trials help improve their ability to judge distances in subsequent, shorter trials.
The Effects of Age and Set Size on the Fast Extraction of Egocentric Distance.Gajewski, DA., Wallin, CP., Philbeck, JW.[2020]
In a study with 32 Taiwanese university students, it was found that increasing the spacing between standard and comparison stimuli led to greater errors in depth perception, indicating that spatial relationships significantly impact visual accuracy.
The color of the light also influenced depth perception, with green light causing more errors compared to white, yellow, and red lights, while viewing distance affected accuracy, with the least errors occurring at 110 cm compared to shorter and longer distances.
Effects of colored lights, spacing between stimuli, and viewing distance on error in a depth-matching task.Huang, KC.[2019]

Citations

Perceived depth modulates perceptual resolution. [2022]
The Effects of Age and Set Size on the Fast Extraction of Egocentric Distance. [2020]
Effects of colored lights, spacing between stimuli, and viewing distance on error in a depth-matching task. [2019]
Seeing beyond the target: environmental context affects distance perception. [2017]
From the most fleeting of glimpses: on the time course for the extraction of distance information. [2021]
Perspective Space as a Model for Distance and Size Perception. [2020]
The stereoscopic sliver: a comparison of duration thresholds for fully stereoscopic and unmatched versions. [2019]
Distortions of three-dimensional space in the perceptual analysis of motion and stereo. [2017]
Range image statistics can explain the anomalous perception of length. [2018]
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