Recruiting

Observational Study

Sponsor:

University of Colorado, Denver

Code:

NCT06587113

Conditions

Eye Movements

Attention

Executive Function

Eligibility Criteria

Sex: All

Age: 18 - 65

Healthy Volunteers: Accepted

Interventions

Contour Search Task

Stop signal Task

Useful field of View

Attentional capture search task

Study Details

Brief summary:

The goal of this study is to investigate the finding that there are large individual differences in how participants move their eyes during active visual search. For example, some individuals tend to fixate, that is point their eyes steadily at a single location, for longer than other individuals before moving to another location. This experiment will use behavioral tasks to measure an individual's attentional and inhibitory functioning, and then see how each of these contributes to between-participant variability in eye movement behavior during visual search.

Conditions

Eye Movements

Attention

Executive Function

Study ID

NCT06587113

Start date

Sep 15, 2024

Status verified date

Feb, 2026

Completion date

May 15, 2026

Anticipated

Primary completion date

May 15, 2026

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18 - 65

Healthy Volunteers: Accepted

Inclusion Criteria:

  • 18-65 years old

Exclusion Criteria:

  • Self-reported history of neurological illness
  • Uncorrected vision problems

Study Design

Enrollment

225 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Basic Science

Interventions and Outcome Measures

Arms

experimental: Study Group Contour Search

This study examines eye movement behavior using eye-tracking technology. Healthy participants perform three different tasks, including a visual search task, a stop-signal task, and a useful field of view task. Behavioral performance and eye movements are recorded for all tasks.

experimental: Study Group Attentional Capture

This study examines eye movement behavior using eye-tracking technology. Healthy participants perform three different tasks, including a visual search task emphasizing distraction, a stop-signal task, and a useful field of view task. Behavioral performance and eye movements are recorded for all tasks.

Interventions

Contour Search Task

In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For the visual search task, participants will search for a visual target among distractors and make a response regarding its orientation. The target is defined by a contour formed through oriented Gabor patches.

Stop signal Task

In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For the stop-signal task, participants will make an eye movement to a target that appears on the screen, except on trials where a visual signal appears indicating they should cancel this behavior.

Useful field of View

In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. In the useful field of view task, participants will report the location of a briefly-presented and masked target, while also responding to the identify of a central target in some blocks.

Attentional capture search task

In this task, participants sit in front of a computer screen with their head in a chinrest to control for distance from the monitor and eye-tracking equipment. For this visual search task, participants will search for a visual target among distractors and make a response regarding its orientation. The target is defined as a unique shape, and is sometimes shown with a salient distractor.

Primary outcome measure

  • First fixation duration during visual search [ Time Frame: During visual search task ]
  • Fixation count during visual search [ Time Frame: During visual search task ]
  • Stop signal reaction time [ Time Frame: During inhibitory task ]
  • Useful field of view thresholding [ Time Frame: During attention task ]
  • Useful field of view dual task performance [ Time Frame: During attention task ]
  • Oculomotor capture by salient distractor [ Time Frame: During visual search task ]

Central Contacts and Locations

Central contacts

Carly J Principal Investigator, PhD

303-315-7068carly.leonard@ucdenver.edu

Ryan V Postdoctoral Fellow, PhD

303-315-7065ryan.ringer@ucdenver.edu

Locations

University of Colorado Denver

Recruiting

Denver, Colorado, United States, 80123

Contacts

Associate Professor, PhD

303-315-7068carly.leonard@ucdenver.edu

Ryan V Ringer, PhD

ryan.ringer@ucdenver.edu

More Information

Sponsor

University of Colorado, Denver

Last update posted

Feb 20, 2026

Last verified

Feb, 2026

Keywords

  • Individual differences
  • Eye movements
  • Perception
  • Attention
  • Inhibition

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-10. This information was provided to ClinicalTrials.gov by University of Colorado, Denver on 2026-02-20.