Why Stress Makes Some Memories Stick: What Parents Need to Know About the Developing Brain

How cortisol influences emotional memory, learning and children’s responses to stressful experiences.

Have you ever wondered why your child can remember an embarrassing moment from school in extraordinary detail, yet struggle to recall what they learned in class that same day? Or why a difficult experience can stay with a child long after the situation itself has passed?

The answer may lie, in part, in how the brain responds to stress.

Research published in Science Advances on October 16, 2026, by scientists at Yale University offers new insight into how cortisol, a hormone released during stress, influences the brain networks responsible for processing emotions and forming memories. The findings help explain why emotionally intense experiences can become particularly memorable, sometimes long after we would prefer to forget them.

For parents raising children in an international environment, these findings are especially relevant. Moving between countries, learning in a second or third language, adapting to a new school, navigating friendships and managing high academic expectations can all involve emotional demands. Understanding how stress affects memory can help us better support children as they learn, adapt and recover from challenging experiences.

What happens in the brain when we experience stress?

Cortisol is often described as the stress hormone. It is released as part of the body's natural response to demands or perceived threats. Although cortisol is frequently discussed in negative terms, its role is more complex: the stress response can help us respond to challenges, focus on important information and remember experiences that may matter for our future safety or success.

When something emotionally significant happens, the brain must perform at least two related tasks. First, it needs to register the emotional significance of the experience. Second, it needs to encode information about that experience so it can be remembered later.

The amygdala, a brain region involved in processing emotional significance, plays an important role in this process. Other brain networks contribute to forming and storing memories.

The Yale researchers investigated how cortisol affects these processes and how the networks involved communicate with one another. Participants received either hydrocortisone, a form of cortisol, or a placebo before viewing a series of pictures while undergoing functional magnetic resonance imaging (fMRI). Their emotional reactions were recorded, and their memory for the pictures was tested the following day.

The researchers found that cortisol strengthened memory for emotionally significant pictures. Their analyses also suggested that cortisol changed activity within networks involved in emotional processing and memory formation, as well as the coordination between these networks.

In other words, the brain does not simply record everything that happens around us equally. Under certain conditions, it gives greater priority to experiences that feel emotionally important.

Why do some experiences stay with us?

Think about a child who has recently started at an international school in the Netherlands.

During a typical school day, the child may learn new vocabulary, complete mathematics exercises, meet classmates and follow unfamiliar classroom routines. Much of this information may be forgotten or gradually consolidated into ordinary knowledge.

Now imagine that, during the same day, the child answers a question incorrectly in front of the class and hears classmates laugh.

Although this incident may last only a few seconds, the child might replay it repeatedly that evening. They may remember exactly where they were sitting, what the other children said and how their face felt when they became embarrassed.

The difference is not necessarily that the embarrassing incident was objectively more important than the mathematics lesson. Rather, it may have carried greater emotional significance for the child.

When an experience triggers a strong emotional response, the brain may devote additional resources to processing and remembering it. This can be adaptive: remembering danger, rejection or an important social experience can help us anticipate similar situations in the future.

However, the same process can also make uncomfortable experiences difficult to put aside.

A child who remembers a distressing classroom incident particularly vividly may begin to anticipate embarrassment in similar situations. They might avoid raising their hand, become reluctant to attend school or worry excessively about making mistakes.

The memory itself is not necessarily the problem. The difficulty arises when the memory becomes linked to expectations of future danger, rejection or failure, influencing how the child interprets and responds to new experiences.

Stress does not automatically improve learning

One of the most important points to take from this research is that stress does not make all memories stronger or learning more effective.

The Yale study focused on emotionally significant experiences in a controlled experimental setting. It does not demonstrate that chronic stress improves academic performance, nor does it establish that children exposed to stressful situations will remember everything more accurately.

A stressful experience may strengthen memory for some aspects of an event while making it harder to concentrate on other information. For example, a child who is worried about being judged may remember a teacher's critical comment but struggle to follow the rest of the lesson.

The effects of stress depend on many factors, including the intensity and duration of the stress, the individual's interpretation of the situation, previous experiences and the support available to them.

It is therefore important to distinguish between a manageable challenge that helps a child engage and learn and stress that overwhelms their ability to cope.

A little excitement before a performance, sporting event or presentation may help a child feel alert and focused. Persistent fear of failure, social rejection or disappointing adults is a different matter.

Children need opportunities to experience challenges, but they also need to feel sufficiently safe to make mistakes, ask questions and recover when things do not go as planned.

Why this matters for international families in the Netherlands

International families often navigate several transitions simultaneously. A child may be learning Dutch while attending an English-language or international school, adjusting to a new curriculum and trying to establish friendships in an unfamiliar cultural environment.

Even positive changes can require considerable emotional and cognitive effort.

1. Learning in another language requires more than vocabulary

A child learning in a language that is not their strongest may be working hard simply to understand instructions, follow conversations and determine when it is appropriate to contribute.

If they are also worried about making mistakes or sounding different from their peers, the emotional demands increase.

When a child appears distracted, forgetful or reluctant to participate, it is worth considering whether anxiety or the effort involved in navigating a multilingual environment is affecting their ability to engage with the task.

This does not mean that every learning difficulty is caused by stress. Persistent concentration or academic difficulties may warrant further investigation. However, understanding the child's linguistic and emotional context is an important part of the picture.

2. Social experiences can feel disproportionately significant

Friendships are central to children's sense of belonging. For a child who has recently moved countries, a disagreement with a friend or an experience of exclusion may feel especially threatening.

Without an established support network, a single difficult interaction can carry considerable emotional weight.

Parents may be surprised by how vividly their child remembers a seemingly minor incident. Instead of dismissing it as insignificant, try to understand what it meant to the child.

Questions such as "What was the hardest part for you?" or "What were you worried might happen next?" can help uncover the emotional meaning of the experience.

The aim is not to confirm that the child's worst interpretation is correct, but to show that their feelings are being taken seriously while helping them consider alternative explanations.

3. After-school meltdowns may reflect accumulated demands

Some children manage to keep themselves together throughout the school day, only to become tearful, irritable or overwhelmed when they arrive home.

Parents may wonder why their child can follow school routines but seems unable to manage ordinary requests at home.

For some children, maintaining attention, regulating emotions, navigating social interactions and meeting expectations throughout the day requires substantial effort. By the time they reach a familiar and safe environment, their capacity to cope with additional demands may be reduced.

Stress-related emotional memories may also contribute to this pattern. A difficult interaction at school can continue to occupy a child's thoughts after the event has ended.

This does not mean every after-school meltdown is caused by cortisol or emotional memory. Fatigue, hunger, sensory overload, neurodevelopmental differences and other factors can also contribute.

Nevertheless, it is useful to view these moments as potential signals of accumulated demands rather than automatically interpreting them as defiance or poor behaviour.

How can parents help children process stressful experiences?

Parents cannot prevent children from experiencing disappointment, embarrassment or anxiety, and they do not need to. Everyday challenges provide valuable opportunities to develop resilience, problem-solving skills and confidence.

What parents can influence is how children experience these challenges, how supported they feel afterwards and what they learn from them.

1. Help your child feel safe before trying to solve the problem

When a child is highly upset, lengthy explanations or attempts to correct their thinking may not be helpful immediately.

Start by acknowledging the emotion: "That sounds really embarrassing" or "I can see that you were worried about what the other children thought."

This does not require agreeing with every conclusion the child draws. It simply communicates that their experience matters.

Once the child is calmer, you can begin to explore what happened and what might help next time.

2. Separate what happened from what your child fears it means

Children may move quickly from an event to a broader conclusion.

For example:

• What happened: "I gave the wrong answer in class."

  
  

• What I felt: "I felt embarrassed."

  
  

• What I thought it meant: "Everyone thinks I'm stupid."

  
  

• What I fear will happen next: "Nobody will want to be my friend."

  
  

Helping a child distinguish these elements creates space for reflection

.

You might ask: "What do we know actually happened? What are you guessing the other children thought? Is there another explanation?"

The purpose is not to persuade children that everything is fine. It is to help them recognise that a powerful feeling does not always provide a complete or accurate account of a situation.

3. Make room for positive and meaningful experiences

The Yale findings suggest that emotionally significant experiences can be more memorable. This offers an opportunity to make learning meaningful without deliberately creating stress.

Connect new information to a child's interests, curiosity and everyday experiences. Use stories, humour, practical activities and opportunities for discovery.

For example, a child learning Dutch vocabulary may remember words more easily when they are connected to a favourite game, a trip to the local market or a funny family interaction.

The goal is to support engagement and meaningful learning, not to make every lesson emotionally intense.

4. Help children revisit difficult experiences when they are ready

Avoiding every uncomfortable situation may provide short-term relief but can prevent children from discovering that they can cope.

At the same time, repeatedly asking a child to recount a distressing experience when they are overwhelmed is unlikely to be helpful.

Instead, choose a calm moment to explore what happened, identify what the child learned and consider what they might do differently in the future.

For a child who felt embarrassed speaking in class, this might mean practising an answer at home, agreeing on a small first step with the teacher or identifying a supportive classmate.

If the memory continues to cause significant distress, avoidance or anxiety, professional support may be appropriate.

5. Protect opportunities for recovery

Sleep, predictable routines, movement, play and supportive relationships all contribute to children's capacity to manage everyday demands.

After a demanding school day, some children benefit from a quiet transition before homework, extracurricular activities or questions about school.

Rather than immediately asking, "How was your day? What homework do you have? Did you speak to your teacher?", consider whether your child first needs a snack, time outdoors, drawing, building with Lego or simply a little space.

Recovery is not the same as avoiding responsibilities. It helps children return to those responsibilities with more capacity to cope.

When should parents seek professional help?

Remembering an embarrassing moment or worrying about a difficult interaction is a normal part of childhood. The concern is greater when a child's response becomes persistent, intense or disruptive to everyday life.

Consider seeking advice if your child:

• Repeatedly relives upsetting experiences or becomes very distressed when reminded of them.

• Avoids school, social activities or previously enjoyable situations because of fear.

• Experiences persistent anxiety, sleep difficulties or physical complaints associated with worry.

• Becomes increasingly self-critical or expects negative outcomes in many situations.

• Shows ongoing difficulties with concentration, learning or emotional regulation across settings.

An assessment should consider the broader picture, including developmental history, school experiences, family circumstances, language demands and any relevant learning or neurodevelopmental differences. Stress may be one contributing factor, but it should not automatically be assumed to explain every difficulty.

The key message: memories are powerful, but they do not determine the future

The Yale research adds to our understanding of how stress hormones influence the brain networks involved in emotional processing and memory. It helps explain why certain experiences can leave such a lasting impression and why emotional significance matters when we learn.

For parents, the practical message is not to shield children from every difficult feeling or to try to make learning stressful so that it becomes more memorable.

Instead, it is to recognise that emotional experiences shape how children understand themselves, their relationships and the world around them.

A child who remembers a painful social experience may need help making sense of it. A child who struggles to concentrate may need a closer look at the demands they are managing. And a child who falls apart after school may need time to recover before they can talk about what happened.

With supportive relationships, opportunities to recover and help interpreting difficult experiences, children can learn that an uncomfortable memory is not a prediction of what will happen next.

At Baumgarten Child Psychology and More, we support international children, adolescents and families in the Netherlands with emotional wellbeing, anxiety, learning difficulties and neurodevelopmental questions.

 Understanding the interaction between a child's emotional experiences, learning environment and individual needs is an important part of identifying the support that will help them thrive.

Learn more at www.baumgartenchildpsych.com.

Research note: This article is based on the Yale University research summary dated October 16, 2026, describing findings published in Science Advances. The reported experiment involved adults receiving hydrocortisone or a placebo. The implications for children and everyday family life discussed here are practical applications of the findings, not direct conclusions from a child study.