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Related Experiment Video

Updated: Jun 4, 2026

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Published on: December 24, 2015

Combining information from sources that vary in credibility.

M H Birnbaum¹, R Wong, L K Wong

¹Department of Psychology, University of Illinois at Urbana-Champaign, 61820, Champaign, Illinois.

Memory & Cognition

|February 3, 2011

Summary

Source credibility significantly influences how people integrate information. Higher credibility sources have a greater impact, especially when compared to less credible ones, affecting judgments in a relative, not additive, manner.

Related Experiment Videos

Last Updated: Jun 4, 2026

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Published on: December 24, 2015

Area of Science:

Cognitive Psychology
Social Psychology
Decision Making

Background:

Information integration models explore how individuals combine multiple pieces of information to form judgments.
Source credibility is a key factor that can influence the weight assigned to information.

Purpose of the Study:

To test models of source credibility in information integration.
To investigate how source credibility affects judgment formation in different contexts.

Main Methods:

Two experiments were conducted involving participants estimating used car values and rating person likeability.
Participants received information from sources with varying levels of credibility (expertise or acquaintance length).

Main Results:

Source credibility significantly magnified the impact of the provided information.
The effect of a source's credibility was inversely related to the credibility of other sources.

Conclusions:

Findings support a relative-weight averaging model of information integration, not additive or constant-weight models.
Source credibility plays a crucial, multiplicative role in how individuals process and weigh information from different sources.