HealthyNCT05472961
Eye Movements in Visual Search
A study testing Target and Stimulus in people with Healthy, run by Vanderbilt University at 1 site in United States.
Trial summary
Using a noninvasive eye tracker, the investigators will measure how participants move their eyes to objects arrayed on a computer screen. Participants will be asked to find one element among many. Read more about this study
- Who is it for?
- Ages 18 to 50 years
- Conditions the study is for
- Healthy
- What is being tested?
- Target and Stimulus
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 0 participants
- Where
- 1 siteUnited States
- Study dates
- 20 Feb 2025to 20 Feb 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 50 years
- All sexes
- No healthy volunteers
- Adult
Who may be able to join
- Sona System users (open to the public)
Who cannot join
- participants that fail the Ishihara color vision screening test
- participants with acuity worse than 20/20 with or without correction
- children under 18
- adults over 50
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Eye Movement Studies of Visual Search
Using a noninvasive eye tracker, the investigators will measure how participants move their eyes to objects arrayed on a computer screen. Participants will be asked to find one element among many.
Read the detailed description
The investigators measure how quickly and how accurately participants can move their eyes from a central fixation point to a target object arrayed with one or more distractor objects. A noninvasive eye tracker will be used to measure their eye movements. Participants may also be asked to make a decision about a feature of the target they have selected with a key press. Difficulty of the search for the target object and difficulty of the decision about a feature of the target object will be manipulated.
- Conditions
- Healthy
- Being tested
- Target and Stimulus
- Keywords
- eye tracker, visual perception
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Target and StimulusBehavioural
The investigators manipulate the difficulty of search for the target object by manipulating the number of distractor objects and/or the similarity between the target and distractors. The investigators manipulate the difficulty of the decision about a feature by manipulating the similarity of the feature to a criterion. The investigators manipulate the timing of when the decision feature appears on the object relative to the onset of the array and/or the onset of the saccade away from fixation in a gaze-contingent manner.
| Study group | Role | What they receive |
|---|---|---|
| Within Subjects Experimental Design | Experimental | All participants are tested in all conditions. Receives: Behavioral: Target and Stimulus |
What is being measured
The primary outcome is the main question the study is designed to answer.
Eye Tracking Data
Saccade Events, Fixation Events, Pupil Size
Measured: During 1-2 hour experimental session
Response Data
Response Time, Error Rate
Measured: During 1-2 hour experimental session
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Jul 2022
- Study start20 Feb 2025
- Primary completion20 Feb 2025
- Study completion20 Feb 2025
Why it stopped: No human participants were required as part of the computational modelling for this experiment during the period of this project. No participants were recruited and no data was collected.
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for HealthyStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Not applicable
- Intervention model
- Single group
- Model description
- Participants are asked to view an array of objects on a computer screen equipped with a noninvasive eye tracker. They are asked to search for a target object among one or more distractor objects and may be asked to respond to a feature of the target object with a key press that was selected via a gaze shift.
- Masking
- None (open label)
- Enrolment
- 0 participants (actual)
Sponsor and investigators
- Lead sponsor
- Vanderbilt University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Thomas J. Palmeri, Vanderbilt University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05472961
- Sponsor's protocol ID
- 140970
- Status last verified
- Feb 2025
- First submitted
- 21 Jul 2022
- Last updated
- 21 Feb 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: Only de-identified behavioral data will be shared with other investigators upon request.
Study at a glance
From the registry record, last updated by the sponsor on 21 Feb 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Eye Movement Studies of Visual Search
- ClinicalTrials.gov ID
- NCT05472961
- Acronym / sponsor ID
- 140970
- Conditions
- Healthy
- Keywords
- eye tracker, visual perception
- Study type
- Interventional
- Recruitment status
- WithdrawnReason stopped: No human participants were required as part of the computational modelling for this experiment during the period of this project. No participants were recruited and no data was collected.
- Enrolment
- 0 participants (actual)
- Lead sponsor
- Vanderbilt UniversityUniversity, hospital or other
- Study start
- 20 Feb 2025 (actual)
- Primary completion
- 20 Feb 2025 (actual)
- Study completion
- 20 Feb 2025 (actual)
- First posted
- 25 Jul 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Using a noninvasive eye tracker, the investigators will measure how participants move their eyes to objects arrayed on a computer screen. Participants will be asked to find one element among many.
Detailed description
The investigators measure how quickly and how accurately participants can move their eyes from a central fixation point to a target object arrayed with one or more distractor objects. A noninvasive eye tracker will be used to measure their eye movements. Participants may also be asked to make a decision about a feature of the target they have selected with a key press. Difficulty of the search for the target object and difficulty of the decision about a feature of the target object will be manipulated.
Study design
- Primary purpose
- Basic science
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
- Model description
- Participants are asked to view an array of objects on a computer screen equipped with a noninvasive eye tracker. They are asked to search for a target object among one or more distractor objects and may be asked to respond to a feature of the target object with a key press that was selected via a gaze shift.
| Arm | Type | Receives |
|---|---|---|
| Within Subjects Experimental Design | Experimental | Behavioral: Target and StimulusAll participants are tested in all conditions. |
Who may qualify
- Ages
- 18 to 50 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Sona System users (open to the public)
Key exclusion criteria (4 listed)
- participants that fail the Ishihara color vision screening test
- participants with acuity worse than 20/20 with or without correction
- children under 18
- adults over 50
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Target and StimulusThe investigators manipulate the difficulty of search for the target object by manipulating the number of distractor objects and/or the similarity between the target and distractors. The investigators manipulate the difficulty of the decision about a feature by manipulating the similarity of the feature to a criterion. The investigators manipulate the timing of when the decision feature appears on the object relative to the onset of the array and/or the onset of the saccade away from fixation in a gaze-contingent manner. | Behavioural | Within Subjects Experimental Design |
Primary outcome
Eye Tracking Data
Time frame: During 1-2 hour experimental session
Saccade Events, Fixation Events, Pupil Size
Response Data
Time frame: During 1-2 hour experimental session
Response Time, Error Rate
Results and safety
The study was withdrawn before enrolling participants, so there are no results.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Feb 2025.
- Individual participant dataSharing planned: Yes. Only de-identified behavioral data will be shared with other investigators upon request.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Target and Stimulus in people with Healthy, run by Vanderbilt University at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: withdrawn, as of the sponsor's last update on 21 Feb 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study was withdrawn before enrolling participants, so there are no results.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Eye Tracking Data (time frame: During 1-2 hour experimental session). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Feb 2025.