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Psychologist with the best job—studying baby laughter—has some seriously wholesome science

baby laughter
Photo by Deedee Geli on Unsplash

Before there are words, there is laughter. Babies make gigglefests look easy. They laugh at everything from traffic jams, to dogs and cats, to mommy and daddy tying their shoes. No punchline necessary. LOLs abound.

As sweet as it is, a mystery still remains. Exactly why do babies laugh?

Developmental psychologist Caspar Addyman aims to answer this question. And he takes his job very seriously, tirelessly conducting experiments to study human behavior. His subjects? Babies. His research? Laughter. That's right. Someone spends all day listening to the innocent giggles of small children. Arguably the best job in the world, second to petting cats.

Addyman's baby laughter studies have inspired some other innovative and creative projects, such as the Shake, Rattle, and Roll (play specifically made for babies to make them laugh) or Imogen Heap's Happy Song, which she collaborated with Addyman on. And though his research was making headlines a year ago, it's once again going viral. Because his findings are simple, heartwarming and profound.

Collecting parents' observations of their baby's laughter—ages ranging from newborn to 2.5 years old—Addyman would ask when the baby's first laugh was, if mommy or daddy was funnier and if certain toys inspired more chuckles than another. Through his worldwide studies, Addyman gained these insights:


Peekaboo is the ultimate funny.

baby laughter studyPhoto by tian dayong on Unsplash

To no parent's surprise, peekaboo is a never-ending barrel of laughs. But what about it is so funny? One of the reasons, according to Addyman, is that babies have no concept of time. So each time mommy or daddy magically disappears, it comes as a shock. Then when the beloved parent comes back, the surprise is a riot. But the fun doesn't stop there. As babies develop a sense that a mom or dad will come back, the game evolves into delightful anticipation. That's why even 2-year-olds still find peekaboo amusing.

Tickling is the second contender.

why do babies laughPhoto by Gabe Pierce on Unsplash

Though this one has the bonus of physical stimulus, the most important factor is the social context. Which is why receiving a tickle from a stranger is terrifying, where a tickle from mommy is welcomed and hilarious. Addyman says that tickling also developed from an even older communication ritual: "Tickling has deep evolutionary roots that come from being a mammal. It's partly related to grooming, a vital function that is also pleasurable." Tickling, like grooming, is a one-on-one trust-building experience.

When it comes to laughter, the more the merrier.

scientist studies baby laughterPhoto by Nathan Dumlao on Unsplash

When a cartoon played to a group of preschoolers, they laughed eight times more than when that same cartoon played in front of a single preschooler, alone. This implied that laughter is primarily a social tool of communication. "It's a genuine signal that you send when you're in a relaxed and comfortable situation," Addyman says in his interview with TED. He noted that even the preschoolers who watched the cartoon alone would often look toward the researchers during the funny bits. Laughter gives us a sense of belonging.

Freud was wrong.

baby laughter ted talkPhoto by Juan Encalada on Unsplash

Babies do not instinctively find joy in another's pain. Addyman's studies showed that babies were more likely to laugh at themselves falling over, versus someone else. Schadenfreude, therefore, seems to be a concept we learn in adulthood to cope with the harsh realities of life, rather than something we're born with.

Mommy is no less funny than Daddy.

baby laughter sciencePhoto by Seth Reese on Unsplash

Both mom and dad seemed to score equal amounts of funny points. However, parents also reported that their sons laughed close to 50 times a day, whereas their daughters seemed to only chuckle around 37 times. The divide, Addyman says, could be due to how the behavior is "reinforced by the parents … If you think your boy baby is laughing more, you may try to make them laugh more."

The key ingredient to laughter: LOVE.

science of laughterPhoto by Daniel Thomas on Unsplash

"Happiness is greatest when we're with our loved ones," Addyman says. Human connection is far more impactful than a puppet or a toy. Hence the power of peekaboo. More than anything, a baby is looking for pure social interaction and undivided attention from their adult protectors. Their laughter is a way of having a heartfelt conversation.

Addyman admits that in a grown-up world, laughter might not come as easily. But he says the first step is to do what babies do: just be in the moment. "Babies laugh more than us because they take the time to look around," he says. Addyman thinks that a baby's pure, (literally) unadulterated laughter might be an expression of "flow," a term created by psychologist Mihaly Csikszentmihalyi to label that joyful state where you're so fully immersed in the present moment, you can't help but enter bliss. Considering how effortlessly a baby can reach joy, it seems he's onto something.


Plus his own studies are far from over. Next Addyman plans to explore how a baby's laughter plays a role in their learning process. There's still so much to learn, and laugh at.

By the way, you can watch Addyman's inspiring TEDxBratislava Talk on laughter via YouTube. It's great for all ages.

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Three women, three MS journeys: How multiple sclerosis looks different for everyone

Gina, Nathalie and Helga share their reactions to being diagnosed with MS and how they stay informed and positive in the face of ever-changing symptoms.

Courtesy of Sanofi

Helga, Nathalie and Gina all have MS, and their experiences show how differently the disease can manifest.

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It’s been 155 years since neurologist Jean-Martin Charcot gave the first lecture on a mysterious progressive illness he called “multiple sclerosis.” Since then, we’ve learned a lot. We know MS causes the immune system to attack healthy tissue, including damaging the brain and spinal cord. Resulting symptoms can be debilitating and include fatigue, blurred vision, memory problems and weakness. Huge advancements in our understanding of MS and its underlying causes, as well as treatment advances, have been made in the past few decades, but MS remains a complex and unpredictable reality for the 2.8 million+ people diagnosed around the world.

Ironically, the only real constant for people living with MS is change. There’s no set pattern or standard progression of the disease, so each person’s experience is unique. Some people with MS have mild symptoms that worsen slowly but sometimes improve, while others can have severe symptoms that drastically alter their daily lives.

All people with MS share some things in common, however, such as the need to stay informed on the ever-evolving research, find various lines of support and try to remain hopeful as they continue living with the disease.

To better understand what navigating life with MS really looks like, three women shared their MS stories with us. Their journeys demonstrate how MS can look different for different people and interestingly, how the language used to talk about the disease can greatly impact how people understand their realities.

woman with horse, woman riding horseGina loves riding her horse, Benita.Courtesy of Sanofi

Gina—Hamburg, Germany (diagnosed with relapsing multiple sclerosis in 2017)

When her youngest son was 4 months old, Gina started having problems with her eye. She’d soon learn she was experiencing optic neuritis—her first symptom of MS.

“Immediately after the diagnosis, I looked up facts on MS because I didn’t know anything about it,” Gina says. “And as soon as I knew what could really happen with this disease, I actually got scared.”

As her family’s primary income provider, she worried about how MS would impact her ability to work as a writer and editor. Her family was afraid she was going to end up in a wheelchair. However, for now, Gina’s MS is managed well enough that she still works full-time and is able to be active.

“When I tell somebody that I have MS, they often don't believe me the first time because I don't fulfill any stereotypes,” she says.

Overwhelmed by negative perspectives on living with MS, Gina sought support in the online MS community, which she found to be much more positive.

“I think it’s important to use as many positive words as you can when talking about MS.” It’s important to be realistic while also conveying hope, she says. “MS is an insidious disease that can cause many bad symptoms…that can be frightening, and you can't gloss over it, either.”

To give back to the online community that helped her so much, Gina started a blog to share her story and help others trying to learn about their diagnosis.

Though she deals with fatigue and cognitive dysfunction sometimes, Gina stays active swimming, biking, riding horses and playing with her sons, who are now 11 and 6.

Cognitive dysfunction is common in MS, with over half of people affected. It can impact memory, attention, planning, and word-finding. As with many aspects of MS, some people experience mild changes, while others face more challenges.

Gina says that while there’s still a lot of education about MS needed, she feels positive about the future of MS because there’s so much research being done.

woman in wheelchair holding medal, woman rowingNathalie is an award-winning rower with multiple international titles.Courtesy of Sanofi

Nathalie — Pennes Mirabeau, France (diagnosed with relapsing-remitting multiple sclerosis in 2002)

Nathalie was a teenager and a competitive athlete when she noticed her first symptoms of MS, but it would take four years of “limbo” before she was diagnosed.

“Ultimately, the diagnosis was more of a relief, than a shock,” she says. “Because when you have signs and you don’t know why, it’s worse than knowing, in the end, what you have.”

However, learning more about the disease—and the realities of disease progression—scared her.

“That glimpse of the future was direct and traumatic,” she says. Her neurologist explained that the disease evolves differently for everyone, and her situation might end up being serious or very mild. So, she decided to stop comparing herself to others with MS.

She said to herself, “We’ll see what happens, and you’ll manage it bit by bit.”

By 2005, Nathalie’s MS had progressed to the point of needing a wheelchair. However, that has not dampened her competitive spirit.

Nathalie began her international rowing career in 2009 and has won multiple world titles, including two Paralympic medals—silver in London and bronze in Tokyo. Now, at 42, she still trains 11 times a week. Fatigue can be a problem, and sometimes hard workouts leave her with muscle stiffness and shaking, but she credits her ongoing sports career for helping her feel in tune with her body’s signals.

“Over the years, I’ve learned to listen to my body, letting my body guide when I need to stop and take breaks,” she says.

Nathalie explains that she used to only look backwards because of the initial shock of her diagnosis. In time, she stopped thinking about what she couldn’t do anymore and focused on her future. She now lives in the following mindset: “Even when doors close, don’t miss out on those that open.” Instead of focusing on what she can’t do, she focuses on the opportunities she still has. Right now, this includes her training for the 2024 Paralympic Games in Paris, where she will compete for another rowing medal.

“I only go forward,” she says. “Well, I try, anyway…It’s easy to say, it’s not always easy to do. But that’s what I try to do.”

woman exiting water after swimming, woman with great daneHelga's Great Dane has become a helpful and beloved companion.Courtesy of Sanofi

Helga—Johannesburg, South Africa (diagnosed with relapsing multiple sclerosis in 2010)

When Helga first started having balance issues and numbness in her feet, she chalked it up to her training as a runner. But when the numbness moved to her face, she knew something was wrong. She never guessed it was MS.

“When I was diagnosed, I felt completely overwhelmed and clueless,” Helga says. “I felt that I had nowhere near enough information. I did not know anything about the disease…I had no idea that it was going to be a process of continually monitoring and adjusting your lifestyle.”

In the beginning, Helga’s symptoms developed slowly, and she didn’t appear ill to others. She was even able to run for a few years after her diagnosis, but she couldn’t do marathons anymore, and she began to fall frequently due to balance issues and right-foot dragging. Then her cognition issues became more problematic, especially in her job as a trainer in a printing company.

“My executive function, decision-making and short-term memory were affected to the point that I was eventually medically unfit for work,” she says. She stopped working in 2017.

However, she didn’t stop living life. Even though she could no longer run, she continued to swim competitively. She got a Great Dane puppy and trained him as a service dog to help her walk. She also serves as vice chair of the patient support organization Multiple Sclerosis South Africa, and she advises others who have been diagnosed to join a patient advocacy group as soon as possible to get reliable information and meet others with MS.

Helga says she is “hopeful” about the future of MS. “I must say that I am so grateful that we have all the new medications available, because my life would not be the same if it wasn't for that,” she adds.

Part of how she manages her MS is by looking at the positives.

“If I could tell the world one thing about MS, it would be that MS is an incurable disease of the nervous system, but it's also the greatest teacher of valuing your health, family, friends, and managing change in your life,” she says. “My life is diversified in a way that I never, ever thought it would, and MS has been honestly the greatest teacher.”

Each MS journey is unique – with each person impacted experiencing different struggles, successes, and feelings as they manage this unpredictable disease. But the common thread is clear – there is a critical need for information, support, and hope. We are proud to participate in World MS Day and share these incredible stories of living life while living with MS. To learn more about MS, go to https://www.sanofi.com/why-words-really-matter-when-it-comes-to-multiple-sclerosis.

MAT-GLB-2301642-v1.0-05/2023

This article was sponsored by Sanofi. Participants were compensated when applicable.

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