Warning before misinformation exposure modulates memory encoding

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Exposure to misleading post-event information can distort eyewitness memory reports.
• The misinformation effect describes this memory impairment.
• Prewarnings about information reliability can mitigate this effect.

Purpose of the Study:

• To investigate if prewarnings improve memory accuracy by altering neural activity during misinformation encoding.
• To examine the neural mechanisms underlying the protective effect of prewarnings.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used in a repeated retrieval misinformation paradigm.
• Participants witnessed an event, received post-event information (consistent, neutral, misleading), and completed memory tests.
• A prewarning group was compared to a no-warning control group.

Main Results:

• Participants receiving a prewarning showed reduced susceptibility to misinformation.
• Prewarned participants exhibited increased frontal activity (lateral PFC, ACC) during misleading trials.
• A global reduction in auditory and semantic processing areas was observed in the prewarning group.

Conclusions:

• Prewarnings enhance memory accuracy by modulating neural activity during the encoding of post-event information.
• Frontal regions involved in source encoding and conflict detection are key to this protective effect.
• Neural activity changes during misinformation exposure predict behavioral protection from memory distortion.