Why emotion anchors memories: what neuroscience already knows

You may remember exactly where you were when you got news that changed your life. The kitchen, the color of the tablecloth, the TV on in the living room, the way the voice on the other end of the line broke on the second sentence. Your memory recorded it all on its own, as sharp as a photograph, and has kept the scene for years without asking anyone's permission. Neuroscience has spent decades trying to understand why the brain protects certain moments so fiercely, and what it has found matters to your brand, which needs to be remembered.

The amygdala and the consolidation of emotional memories

The name that appears in almost all of this research is the amygdala, a small structure deep inside the brain. In a review published in 2004 in the Annual Review of Neuroscience, neuroscientist James McGaugh describes the amygdala as central to acquiring and retaining lasting memories of emotional experiences. Kevin LaBar and Roberto Cabeza, in Nature Reviews Neuroscience in 2006, summed up the idea in a sentence we adopted as the epigraph of this series: emotional events often attain a privileged status in memory.

What intrigues us most in this story is time. A memory keeps setting after the event, in a process researchers call consolidation. In a 2015 piece for the Association for Psychological Science, McGaugh recalls experiments in which the stress hormone epinephrine, given to rodents shortly after training, improved memory. When researchers applied propranolol directly to the amygdala, the effect disappeared. In humans, the same propranolol blocked the memory gain caused by emotional arousal, according to the 1994 study by Cahill, Prins, Weber and McGaugh, which he revisits in the same piece.

Keep the caveat in the box above in mind. Proof of cause and effect comes mainly from animals, and brain imaging in people shows correlation. Even with this caution, the body of evidence points in a consistent direction: what stirs us receives special treatment when it becomes a memory.

Emotional memories are forgotten more slowly

In 2015, Andrew Yonelinas and Maureen Ritchey published a review in Trends in Cognitive Sciences with a title that seems written by a scriptwriter: the slow forgetting of emotional episodic memories. The conclusion is direct. The current literature indicates that emotional memories are forgotten more slowly than neutral ones, and the authors attribute a decisive role in this effect to the amygdala.

The researchers themselves point out limits. They propose an alternative explanation to the classic consolidation theory, a sign that the mechanism is still under debate. Most of the evidence comes from negative, arousing material, and the effect with positive stimuli remains an open question. They also acknowledge several important questions the model leaves unanswered.

Translated into the life of a brand, the finding suggests a less steep forgetting curve for whatever touched someone. Among the dozens of pieces a person sees in a week, the ones that carry a concrete, heartfelt scene tend to last longer in memory. A month later, the practical question for whoever is investing is whether some piece of that scene is still alive in the viewer's mind, and whether the brand is in that piece.

When emotion steals the scene from the brand itself

If you approve scripts, hold on to this caveat. In a 2005 study in Psychology and Aging, Elizabeth Kensinger, Olivier Piguet, Anne Krendl and Suzanne Corkin observed that the vividness of memories increases for emotional items and that memory for the central details of a scene gets stronger. The same paper warns that emotion does not always improve memory. Emotional arousal seems to narrow attention and push peripheral details aside.

In an advertising piece, the peripheral detail is often the brand itself: the logo in the corner, the sign-off in the last two seconds, the packaging that appears when the music has already ended. The viewer leaves the film with a heavy heart and no idea who told that story. Ipsos, in a 2016 analysis by Gailynn Nicks, reaches a compatible recommendation: emotion makes it easier to recall the brand at the moment of choice when it comes within a consistent structure, with distinctive brand assets.

The excerpt shows in practice what Kensinger's research suggests. The film's first image is the packaging itself, revealed by the fridge light, and in the sequence that follows the bottle stays in the same spot in the frame while the characters change around it. The product sits at the center of the scene, the place emotion lights up, and so it tends to be remembered along with it.

Vivid memories, high confidence: the warning from flashbulb memories

Let's go back to the kitchen from the first paragraph. Jennifer Talarico and David Rubin asked 54 Duke students to record, on September 12, 2001, how they had learned about the attacks of the day before. The students were tested again 1, 6 or 32 weeks later. The title of the article, published in 2003 in Psychological Science, already sums up the conclusion: confidence characterizes these memories. According to the authors, their special feature lies in the accuracy the person believes they have.

For your brand, this calls for humility. Emotion keeps a memory alive, full of color and certainty, and over time the person may retell the details in their own way, rearranging the scene each time they remember it. That is why brand assets need to be simple and repeated firmly, so they can withstand this silent rewriting.

The question from Léo Bento, our founder, brings the subject to the face of the person receiving the message:

The chin comes in here as an image. There is no peer-reviewed study confirming chin trembling as a marker of crying, and we treat this observation with that caution. The question remains valuable because it makes you think, when it is time to approve a piece, about real people sitting in front of a screen, silently deciding what they will keep.

Damasio, peak and end: hypotheses still under debate

In marketing conversations, the somatic marker hypothesis, associated with neuroscientist A.R. Damasio, often appears as proof that we decide with emotion. Read the authors' own wording carefully. In a 2005 article by Bechara, H. Damasio, Tranel and A.R. Damasio, somatic markers appear as feelings that, when associated with a negative future outcome, work as an alarm signal. They write that, depending on the circumstances, emotions can play a useful or a disruptive role in decision-making. A critical review by Dunn, Dalgleish and Lawrence, from 2006, concluded that the hypothesis needs additional empirical support to remain tenable. In our view, the fair name for it is an influential, debated hypothesis.

The same caution applies to the peak-end rule. In 1993, Kahneman and colleagues showed that 22 of 32 participants preferred to repeat a longer painful experience, with a hand in cold water, because it ended slightly less uncomfortably. In 2003, a study of 682 colonoscopy patients, by Redelmeier, Katz and Kahneman, found a result along the same lines. The rule deals with how people evaluate experiences, especially pain, and applying it to ads is an extrapolation. In the tenth article of the series, we show how to use it in the structure of a script with this honesty.