brain scans

WTF Fun Fact 13091 – Scent Makes Dogs Feel Safe

You probably already know your dog is happy to be around you. They’re pretty good at showing it. Your behavior towards your dog is what matters most. But once they feel secure in your presence, your scent makes dogs feel safe.

The research on scent making dogs feel safe

Have you ever smelled a scent that reminded you of someone (perfume, for example) and had it stir your emotions?

Gregory Berns, a neuroeconomist at Emory University, performed functional magnetic resonance imaging (fMRI) on dogs (don’t worry, he taught them to sit still).

“We started the dog project about three years ago to get around this problem that we really don’t know what dogs are thinking or what they’re experiencing,” Berns said, according to National Geographic (cited below).

The goal was to see the activity of the brain’s nerve cells in order to get a hint of what they might be thinking. Of course, there’s a lot of interpretation to do to turn those images into ideas about doggy feelings. But they studied the part of the brain that is associated with reward.

According to NatGeo: “In the new study, Berns and his team performed fMRI on 12 dogs, including 5 service or therapy dogs and his own dog, Callie, to test their response to biological odors. The experiment dogs were presented with five scents on gauze pads: a familiar human, an unfamiliar human, a dog that lived in their household, an unfamiliar dog, and their own scent. The researchers found that the dogs’ caudate nucleus, an area of the brain associated with positive expectations, was most activated by the scent of the familiar person.”

The scent of a dog owner

The results suggested that dogs can pick out their owner’s familiar scent, AND it tends to produce a positive reaction that shows up in the reward center of the brain.

The dogs didn’t react to the other scents in any way that would indicate they had an emotional reaction to them.

While this is sweet and all, the research will be beneficial for service animals.

“What’s more, scanning potential service dogs for enhanced brain responses may pinpoint canines that are most up to the task. Training service dogs is very expensive, he said, and only 30 to 40 percent of those trained are placed with a person. Overall, Berns believes the dogs experience something akin to pleasure when they smell their owners.” — WTF fun facts

Source: “Dog Brains Link Pleasure With Owner’s Scent” — National Geographic

WTF Fun Fact 13073 – Teens Tune Out

Got teenagers? Do you feel like they listen to you? If not, it’s likely because our brains rewire themselves to tune out our parents in our teen years. In fact, Stanford University research shows that teens tune out their mothers’ voices around the age of 13.

How teens tune out

More specifically, according to Stanford (cited below), “Around age 13, kids’ brains no longer find their moms’ voices uniquely rewarding, and they tune into unfamiliar voices more.”

Of course, this doesn’t give a person a free pass not to listen to their mom. But it does seem to be an evolutionary mechanism. Our brains are preparing to separate us from our parents in the long run – something we all have to do in order to become successful adults.

Clinical associate professor of psychiatry and behavioral sciences Daniel Abrams, Ph.D. told Stanford News: “Just as an infant knows to tune into her mother’s voice, an adolescent knows to tune into novel voices. As a teen, you don’t know you’re doing this. You’re just being you: You’ve got your friends and new companions and you want to spend time with them. Your mind is increasingly sensitive to and attracted to these unfamiliar voices.”

Rewarding signals

All of these changes have to do with the reward centers of the brain. The brain prioritizes stimuli (like certain voices) that activate the reward centers. Unfamiliar voices start to stimulate the brain more around age 13. So while they are still capable of listening to their moms, teens simply don’t get the same level of stimulation and comfort from her familiar voice as they did as children.

In most ways, this is a good thing. It’s a sign that their brain is maturing and getting ready to engage with the world independently from their parents. This allows them to become “socially adept outside their families” – something required for any adult.

How things change over time

Under the age of 12, kids can identify their mom’s voice with great precision, and it tends to activate reward centers and emotion-processing regions of the brain. But if you’re a mom, take heart. Your voice is what sets your child’s brain up for their social and emotional future.

According to co-author Percy Mistry, Ph.D., “The mother’s voice is the sound source that teaches young kids all about the social-emotional world and language development.”

But things change as we grow up. And the switch towards privileging unfamiliar voices between ages 13 and 14 happens at the same time in all genders. — WTF fun facts

Source: “The teen brain tunes in less to Mom’s voice, more to unfamiliar voices, study finds” — Stanford University