[Dr. Algoe] When we get into a romantic relationship,
it's all sparks, and flowers, and hikes, and coffees.
But over time, the romantic couple gets into routines.
And so what we've argued
is that the moments of gratitude still matter,
because when we say "thank you,"
we're sending a message to the person
who just did something nice for us,
that they are valued, that they're seen,
that the thing that they did for us
was worth doing in the first place.
[Narrator] Thank you.
We often take the power of it for granted,
but it's fundamental to keeping your relationship healthy.
And letting your partner know that you appreciate them
can resonate throughout whole communities.
- I'm Dr. Sara Algoe, and I study the emotions
and social interactions that are at the heart
of our very best relationships.
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We do have really cool evidence
from hundreds of video-recorded conversations
where we had romantic couples in the lab.
One person just picks something that their partner
had done for them recently,
and we had them express gratitude to their partner.
Let me give you an example.
There was a work party,
and one partner remembered
that her partner likes lemon bars
and brought one home.
That was the thing.
It's a really little thing,
but the way that he expressed gratitude for it,
he said, "The fact that you remembered that,
that you were thinking about me."
And then he said, "It's not just this.
You do this kind of thing for me
and for other people all the time."
So it's just about putting that extra little emphasis
on what it was about their behavior
that really stood out.
[Narrator] Sara's research shows it's all about describing
the specific thing about your partner
that you're thankful for.
That is what helps to drive closeness and affection.
Her research also focuses on someone
who witnesses this exchange of gratitude.
When the witness sees that "thank you,"
they feel an increased sense of openness
towards the person that said it,
and that can lead to greater self-disclosure,
which is a measurement of how vulnerable
and honest someone is when talking about themselves.
[Dr. Algoe] And so what we know about self disclosure
is that you disclose a little bit more,
I disclose a little bit more,
and we know from other research that this is exactly
the kind of thing that opens the door
to more enduring and lasting bonds and relationships.
Now there's a twist to this study.
In these videos, the only person that you can see
is the person who's recording this message
to the romantic partner.
You never see the romantic partner in the video,
but we predicted that, actually,
this expression of gratitude to the romantic partner
gives a signal that the romantic partner
is a good person.
They're the kind of person who will go
out of their way to help another person.
[Narrator] Sara's research showed this witness
wanted to get to know the person being thanked,
even though they never saw them.
They had no idea who they were or what they look like,
but because they had been thanked,
they must be someone worth knowing.
Expressions of gratitude make both
the person being thanked
and the person saying "thank you" more appealing.
And that has ripple effects on everyone who witnesses this
and the communities that surround them.
[Dr. Algoe] I will offer you my working definition of love,
which is that it's an other-focused,
positive feeling that really blurs the boundaries
between the self and the other person.
If you think about love as a state
where you think of yourself as really merged
with the other person, then it makes a lot more sense
why you would be willing to sacrifice
for the other person because they're kind of
an extension of who you are.
It's such a little gesture.
It's not that hard to say "thank you" to someone,
but that has the potential
for helping that person establish better relationships.
It has this potential for reverberating effects
throughout your social network,
connecting people within our communities in ways
that I think are just starting to be understood.
- Thanks for watching,
and we hope you enjoyed this video.
Please like and subscribe.
To learn more about gratitude and love,
visit us at templeton.org/bigquestions.