Experiment 2: One Target in Many Situations

NCT06934148 | Recruiting

• 2 other identifiers: 2007P000646-HR01EY017001
• Study Type: interventional
• Target: 40
• Locations: 1 country
• Sites: 1

Brief Summary

The goal is to look for qualitative differences in visual search behavior when one search is performed many times in a row compared to when multiple search tasks are intermixed. Four search tasks are tested. The target is the same in every task but the types of distractors change from task to task. In the Mixed condition, the four tasks are randomly changed from trial to trial. In the Blocked condition, each task is run as a block of 100 trials.

Conditions

Vision; Healthy; Attention

Keywords

visual search; visual attention

Outcome Measures

Primary Outcomes (1)

• Response Time (RT)

  How long it takes to respond that the target is present or absent.

  through study completion, an average of one year

Secondary Outcomes (1)

• Accuracy

  through study completion, an average of one year

Study Arms (2)

Blocked Trials

EXPERIMENTAL

There are four search tasks in this experiment. Each task will be presented in a separate block of 100 trials

Behavioral: Blocked Trials

Mixed Trials

EXPERIMENTAL

There are four search tasks in this experiment. All tasks will be randomly mixed in a single block of 400 trials.

Behavioral: Mixed trials

Interventions

Blocked Trials BEHAVIORAL

Each search task will be presented in a block of trials.

Blocked Trials

Mixed trials BEHAVIORAL

All tasks will be randomly mixed in a single block of 400 trials

Mixed Trials

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Pass Ishihara color vision test

You may not qualify if:

• vision less than 20/25 with correction
• history of neuromuscular or visual disorders

Sponsors & Collaborators

• Brigham and Women's Hospital: lead
• National Eye Institute (NEI): collaborator

Study Sites (1)

Brigham & Women's Hospital

Newton, Massachusetts, 02458-2423, United States

RECRUITING

Study Officials

• Jeremy M Wolfe, PhD

  Brigham and Women's Hospital

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Jeremy M Wolfe, PhD

CONTACT

6178511166; jwolfe@bwh.harvard.edu

Cailey Tennyson, BA

CONTACT

617-525-3681; ctennyson1@bwh.harvard.edu

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: SEQUENTIAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Model Details: Each observer will do 400 "mixed" trials and 400 "blocked trials.

Study Record Dates

• First Submitted: April 11, 2025
• First Posted: April 18, 2025
• Study Start: June 1, 2024
• Primary Completion (Estimated): June 1, 2029
• Study Completion (Estimated): June 30, 2029
• Last Updated: April 21, 2025

Record last verified: 2025-04

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ICF, ANALYTIC CODE
• Time Frame: Data will be placed on the Open Science Framework (OSF) site and should be permanent
• Access Criteria: open

Locations

US (1)