Memory Biases

Suggestibility

Definition

Suggestibility is the tendency to incorporate ideas, details, or interpretations from others into one's own memories and beliefs without noticing they came from an external source. Especially vulnerable are children, people under stress, and situations with authoritative senders.

Real-world example

Ceci and Bruck (1993) studied child witnesses: repeated suggestive questions like 'He touched you here, didn't he?' led over time to a substantial share of children reporting events that had never happened, and later recounting them with detail and emotion as if they actually remembered them.

Suggestibility also plays a role in 'recovered memory' therapy, in questionable police interviews, and in everyday situations: if someone tells you convincingly 'you did say that ...,' you may end up believing you said it.

Supplementary perspective

Suggestibility isn't the same as lying – the person actually believes the memory. It's closely tied to the misinformation effect, but emphasizes the mechanism: repetition, authority, and emotional tone gradually cause a suggestion to be encoded as one's own recollection.

Practical advice

Recognize

—Watch out if a memory first surfaces after repeated pressure or leading questions.
—Check whether details in the memory came from conversation, not from the experience.
—Notice if you become more certain of a memory the more you talk with the same person about it.

Counteract

—Use open questions (What happened? Tell me more.) rather than closed or leading ones.
—Write down important observations early, before conversations can shape memory.
—For important memories: cross-check against independent sources – photos, messages, other witnesses.

Ethical use

—In interviewing children: use validated protocols and avoid repeated pressure.
—In therapy: avoid techniques that 'dig up' memories without independent verification.
—In leadership: ask open questions when investigating incidents, not suggestive ones.