A mega-analysis of memory reports from eight peer-reviewed false memory implantation studies

Area of Science:

• Cognitive Psychology
• Memory Studies
• Forensic Psychology

Background:

• Memory implantation studies are crucial for understanding suggestibility in therapeutic, medical, and legal contexts.
• Previous research shows variability in false memory estimates due to differing operationalizations and induction techniques.
• Generalizability of findings from memory implantation studies is questioned.

Purpose of the Study:

• To develop and apply a reliable coding system for operationalizing false memories based on memory science.
• To systematically combine data from multiple memory implantation studies.
• To provide a valid estimate of false memory formation and identify moderating factors.

Main Methods:

• A reliable coding system with seven criteria (suggestion acceptance, elaboration, imagery, coherence, emotion, memory statements, non-rejection) was developed.
• Independent raters applied this system to transcripts from eight published memory implantation studies (N=423).
• Data amenable to meta-analysis were systematically combined.

Main Results:

• False memories were classified in 30.4% of cases, with an additional 23% showing partial acceptance of the suggested event.
• Memory formation rates reached 46.1% when suggestions included self-relevant information, used an imagination procedure, and lacked a photo.
• The developed coding system demonstrated utility in synthesizing data across studies.

Conclusions:

• The study provides a robust method for analyzing memory implantation data, addressing previous variability.
• A significant portion of participants exhibited false memories or partial acceptance of suggested events.
• Factors such as suggestion content and procedure influence false memory formation rates.