272. Say What Sticks: The Neuroscience of Memorable Communication

What It Covers

Cognitive neuroscientist Carmen Simon joins Matt Abrahams to explain how human brains process and retain information. The conversation covers attention systems, memory formation, and practical techniques — including the "10% message" framework — that communicators can use to ensure audiences remember and act on specific content.

Key Questions Answered

• •The 10% Message Framework: Audiences forget 90% or more of content within 48 hours, so identify one core message you want retained and build everything around it. Test yourself: if you called audience members 48 hours later, would their answers satisfy you? If not, your 10% message lacks sufficient clarity and repetition.
• •Repetition Frequency by Duration: Repeating a core message feels excessive but the data demands it. For a 5-minute presentation, repeat the key message at least 4 times; 10 minutes requires 6 repetitions; 20 minutes requires 12. Repetition does not mean identical phrasing — stories and analogies count, but always return to the exact same core statement.
• •Surprise vs. Novelty Distinction: Novelty requires something never seen before, which is difficult to produce consistently. Surprise only requires combining familiar elements unexpectedly — a pug emerging from an eggshell, for example. Twist what audiences already recognize rather than inventing something entirely new to reliably capture attention and increase memory encoding.
• •Strategic Priming Before Key Points: Place attention-grabbing or unusual elements immediately before the content that must be remembered, not randomly throughout. Priming prepares the brain to process the next stimulus more deeply. A strong story before an abstract point, or a semantic cue before a key concept, increases the likelihood that the following message gets encoded.
• •Unified Group Memory Drives Decisions: In a room of 20 people, each person retains a different random 10% unless the speaker controls it. Since decisions are social rather than individual, fragmented recall across a group slows or prevents action. Competitors who repeat their message more consistently become the familiar source, and audiences unconsciously attribute shared gist to whoever they recognize most.