Levari Exp.20: 2D - Partial Feedback

NCT06355999 | Completed

• 1 other identifier: 2007p000646-F
• Study Type: interventional
• Target: 55
• Locations: 1 country
• Sites: 1

Brief Summary

Suppose that observers are trying to classify a spot on the skin as normal or abnormal and suppose that the two attributes that are important are the color and shape of the spot. The investigators have found that perceptual decisions of this short are shaped by the prevalence of the target abnormality and by the feedback that observers (Os) receive. If abnormal spots are rare (low prevalence), Os will tend to become more conservative about calling spots abnormal. In this experiment, Os see items defined by color and shape. They are looking for one combination (bumpy green). Bumpy green targets can be common (50% prevalence) or rare (10%). Os in one group will get feedback about their responses based on color. The other group will receive feedback based on shape. The investigators will look for effects of prevalence and of the type of feedback. The goal is to better understand perceptual decisions in settings like clinical evaluation of skin lesions.

Conditions

Form Perception; Color Perception; Decision Making

Keywords

shape perception; decision making; prevalence effects; feedback

Outcome Measures

Primary Outcomes (1)

• Percentage of stimuli identified as target items

  Participants are presented with visual stimuli from a 10 by 10 set of 100 possibilities. There are 10 levels of color (blue to green) and 10 levels of shape (smooth="Bouba" to bumpy = "Kiki", fully crossed with each other. Participants are asked to state whether an item is or is not a "green Kiki" target. For each of the 100 items, the primary outcome measure is the percentage of time that the specific item is called "Green Kiki" target.

  Through study completion, an average one 1 year

Study Arms (2)

Color Feedback

EXPERIMENTAL

Observers are told if the color but not if the shape was correctly identified

Behavioral: Color Feedback

Shape Feedback

EXPERIMENTAL

Observers are told if the shape but not if the color was correctly identified

Behavioral: Shape Feedback

Interventions

Color Feedback BEHAVIORAL

Feedback is given about the correctness of the response on the color dimension

Color Feedback

Shape Feedback BEHAVIORAL

Feedback is given about the correctness of the response on the shape dimension

Shape Feedback

Eligibility Criteria

• Age: 18 Years - 80 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• normal color vision- 20/25 or better acuity

You may not qualify if:

• no history of visual or oculomotor disease-

Sponsors & Collaborators

• Brigham and Women's Hospital: lead

Study Sites (1)

Visual Attention Lab / Brigham and Women's Hospital

Boston, Massachusetts, 02215, United States

Location

Study Officials

• Jeremy M Wolfe, PhD

  Brigham and Women's Hospital

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Masking Details: Observers are naive as to the purpose of the experiment until after participation
• Purpose: BASIC SCIENCE
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Model Details: Two groups, each receiving different feedback

Study Record Dates

• First Submitted: March 27, 2024
• First Posted: April 10, 2024
• Study Start: May 1, 2021
• Primary Completion: June 1, 2021
• Study Completion: June 1, 2021
• Last Updated: August 13, 2024

Record last verified: 2024-08

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ICF
• Time Frame: available after data collection, no end time
• Access Criteria: openly available

Locations

US (1)