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Visual Stimulus Competition

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03741595
Recruitment Status : Enrolling by invitation
First Posted : November 15, 2018
Last Update Posted : November 15, 2018
Information provided by (Responsible Party):
Daniel R. Coates, 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.

Condition or disease Intervention/treatment Phase
Visual Pathway Disorder Behavioral: Item spacing Not Applicable

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.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 10 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: Visual Stimulus Competition
Actual Study Start Date : November 1, 2018
Estimated Primary Completion Date : November 1, 2019
Estimated Study Completion Date : November 1, 2019

Arm Intervention/treatment
Experimental: Single Arm Behavioral: Item spacing
Spatial proximity of items to one another

Primary Outcome Measures :
  1. Detection probability [ Time Frame: 2 hours ]
    Ability to detect a target stimulus as a function of flanker proximity

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Normal Vision
  • English language

Exclusion Criteria:

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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03741595

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United States, Texas
University of Houston, College of Optometry
Houston, Texas, United States, 77204
Sponsors and Collaborators
University of Houston

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Responsible Party: Daniel R. Coates, Assistant Professor, University of Houston Identifier: NCT03741595    
Other Study ID Numbers: STUDY00001197
First Posted: November 15, 2018    Key Record Dates
Last Update Posted: November 15, 2018
Last Verified: November 2018

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No