
Nancy Segal
American psychologist
4
APPEARANCES
4
PODCASTS
012
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OCT 5
Sep 12, 2026
#294: World-Leading Twin Researcher Explains Why You Can’t Escape Who You Are - Dr. Nancy Segal
10:39
10:58
11:11
11:19
19:57

Nick BraxHOST
And he achieved it, felt fantastic for a day or two, then emptiness, okay, what's next? So how come I don't feel like I'm okay? How come this hasn't filled that hole? You know, so yeah, I'm interested in that.

Nancy SegalGUEST
And we find that success is often met with great glee initially, but it's fleeting.

Nancy SegalGUEST
Now with athletes, it may be more limited within the athletic scope, but outside athletics, there may be many, many things they can do.

Nancy SegalGUEST
I know in my own case, when I finish something, there's a feeling of elation, but then there's this emptiness and I have to go on to another project.
8 MINS LATER

Nick BraxHOST
While we're on that note, can you, you know, you touched on it before, can you give me a bit more background on just your story and how you actually decided to go down this path? Obviously, like you said, you, you know, you're a twin, but what, what led you down this path? Uh, yeah.
Is Parenting Overrated? (Encore)
73:11
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17:22Nancy SegalGUEST
So when I told a colleague that I was participating in this debate, he said to me, you can't win, because parents believe that what they do makes an incredible difference in the lives of their children.
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17:33Nancy SegalGUEST
But as my colleague Dr. Plowman pointed out, DNA is the key driving force behind how children turn out to be as individuals.
N
17:46Nancy SegalGUEST
They come into the world with genetic predispositions that parents respond to and do not create.
55 MINS LATER
John DonvanHOST
And now to make her closing statement in support of the resolution, Professor of Psychology and Director of the Twin Study Center at California State University Fullerton, Nancy Siegel.
The Secret Twin Study: Files Sealed Until 2065
36:37
46:19
Carter RoyHOST
Years later, they were studied as adults in a study you, Nancy, know well because you took part in the study.
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36:55Nancy SegalGUEST
And then when they met at the age of 39, they discovered a whole long list of similarities in addition to their first names.
9 MINS LATER
Carter RoyHOST
Uh, w- what difficulties have the twins faced in accessing them, and why does the public have to wait so long to see them?
Nancy Segal (on twins)
11:13
11:19
11:27
11:32

Nancy SegalGUEST
So, at any rate, people began to see differences between different breeds of dogs, different mouse strains.

Nancy SegalGUEST
You could train an animal, for example, to avoid noxious noises when you paired it with food.

Nancy SegalGUEST
So, people began to see the constraints on the environment, it just wasn't a full explanation.

Nancy SegalGUEST
Then there was a case study of reared apart twins done by Paul Popenoe in, I think, the 1920s.
S
12:37speaker_5UNKNOWN
Yeah.