Eye Movements in Visual Search

NCT05472961 | Withdrawn

• 1 other identifier: 140970
• Study Type: interventional
• Target: N/A
• Locations: 1 country
• Sites: 1

Brief 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.

Conditions

Healthy

Keywords

eye tracker; visual perception

Outcome Measures

Primary Outcomes (2)

• Eye Tracking Data

  Saccade Events, Fixation Events, Pupil Size

  During 1-2 hour experimental session

• Response Data

  Response Time, Error Rate

  During 1-2 hour experimental session

Study Arms (1)

Within Subjects Experimental Design

EXPERIMENTAL

All participants are tested in all conditions.

Behavioral: Target and Stimulus

Interventions

Target and Stimulus BEHAVIORAL

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.

Within Subjects Experimental Design

Eligibility Criteria

• Age: 18 Years - 50 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• Sona System users (open to the public)

You may not qualify if:

• 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

Sponsors & Collaborators

• Vanderbilt University: lead

Study Sites (1)

Vanderbilt University

Nashville, Tennessee, 37240, United States

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Masking Details: Manipulation is within-participant. Participants view multiple visual search arrays in an experimental session. They will be masked with regards to the difficulty and timing manipulations until they experience them on a trial.
• Purpose: BASIC SCIENCE
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Distinguished Professor of Psychology

Model Details: 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.

Study Record Dates

• First Submitted: July 21, 2022
• First Posted: July 25, 2022
• Study Start: February 20, 2025
• Primary Completion: February 20, 2025
• Study Completion: February 20, 2025
• Last Updated: February 21, 2025

Record last verified: 2025-02

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ANALYTIC CODE
• Time Frame: Data will be shared after all analyses and modeling of the data are complete and manuscripts resulting from the research are accepted for publication.
• Access Criteria: We will share data with investigators who request (after research using the data are complete).

Locations

US (1)