Visual Stimulus Competition

Not Applicable

• Conditions: Visual Pathway Disorder
• Interventions: Behavioral: Item spacing

• Registration Number: NCT03741595
• Lead Sponsor: University of Houston

Brief Summary

In this study, we will use behavioral methods to investigate several types of interactions that occur when visual stimuli conflict, such as when objects are presented nearby to each other, or to separate eyes. We will target purely sensory aspects by using simple geometric shapes: letters and lines. Our outcome measure will be performance thresholds.

Detailed Description

Participants will be shown visual stimuli on displays and be asked to identify some aspect of the stimuli: their orientation and/or color, the existence of binocular suppression, etc.

In different blocks, stimuli will be manipulated in different ways to characterize basic aspects of visual processing. For example, the contrast, color, and/or spatial layout of stimuli will be varied.

Study Timeline

• Status Verified: 2018-11
• Study Start: 2018-11-01
• Study First Submitted: 2018-11-12
• Study First Submitted QC: 2018-11-12
• Last Update Submitted: 2018-11-12
• Study First Posted: 2018-11-15
• Last Update Posted: 2018-11-15
• Primary Completion: 2019-11-01
• Study Completion: 2019-11-01

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 10

Inclusion Criteria

• Normal Vision
• English language

Exclusion Criteria

• Less than 20/20 in either eye
• Vision-affecting abnormalities (amblyopia, keratoconus, etc.)
• Ortho-K lenses

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Single Arm	Item spacing	-

Primary Outcome Measures

Name	Time	Method
Detection probability	2 hours	Ability to detect a target stimulus as a function of flanker proximity

Trial Locations

Locations (1)

University of Houston, College of Optometry; 🇺🇸 Houston, Texas, United States