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Male vs. Female Brain Differences & How They Arise From Genes & Hormones | Dr. Nirao Shah

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Male vs. Female Brain Differences & How They Arise From Genes & Hormones | Dr. Nirao Shah

Huberman Lab

2025/07/28
Huberman Lab

Huberman Lab

2025/07/28
OverviewShownoteHighlightsTranscriptChaptersPins

Shownote

My guest is Dr. Nirao Shah, MD, PhD, a professor of psychiatry, behavioral sciences and neurobiology at Stanford University School of Medicine. We discuss how the brains of males and females differ and how those differences arise from different genes and h...

Highlights

In this in-depth discussion, Dr. Nirao Shah explores the biological and genetic foundations of sex differences in the brain, shedding light on how hormones like testosterone and estrogen shape neural development and behavior across the lifespan. The conversation delves into the role of key genes, such as the SRY gene, and how hormonal exposure during critical developmental periods influences not only sexual differentiation but also broader behaviors, including mating, parenting, and aggression.
02:11
Stimulating hypothalamic circuits can elicit similar behaviors in both mice and humans.
05:35
Testosterone organizes the brain during development
12:52
SRY suppresses femaleness and amplifies maleness
18:32
Eight Sleep's Pod 5 offers cooling, heating, and NSDR relaxation tools
19:13
SRY gene is considered deterministic for maleness
25:12
SRY-related hormones play a key role in shaping the brain.
27:53
Testosterone exposure in female guinea pigs leads to male-like sexual behavior
31:25
Female infants with CAH are genetically female, fertile, and typically do not develop facial hair despite masculinized genitalia.
38:42
Individuals with androgen insensitivity syndrome are feminized despite XY chromosomes
43:46
Some brain regions controlling innate behaviors show binary sex differences in cell numbers
52:30
Removing testosterone in male mice and giving female hormones doesn't make them sexually receptive like females.
58:03
Adult hormone levels don't clearly define sexual orientation
1:09:36
An enzyme converting androgen into estrogen was discovered in human embryonic brain tissue.
1:10:37
Steroid hormones can enter the nucleus and regulate gene expression through receptor binding.
1:15:05
The discussion revolves around the challenges in determining when young people can make decisions about gender
1:19:05
Activating Tacr1-expressing neurons eliminates the refractory period in male mice
1:21:40
Function provides insights into biomarkers and toxin levels like mercury
1:26:22
Activating Tacr1 cells leads to dopamine release in the nucleus accumbens
1:27:05
Stimulating Tacr1 cells leads to reward-seeking without mating in virgin males
1:32:44
Testosterone levels vary widely at each age, and libido also varies greatly.
1:36:17
TACR1 cells project densely to the periaqueductal gray, a region involved in pain and innate behaviors.
1:42:36
Caring for others reduces selfishness and enhances altruism through oxytocin
1:43:18
Prairie voles form pair bonds even without oxytocin receptors, suggesting alternative mechanisms like vasopressin
1:52:55
Stimulating Tacr1 neurons in animals creates insatiable libido, suggesting a potential druggable target.
2:02:12
Estrogen helps preserve brain function and vascular health in both sexes.
2:07:51
Optogenetic activation of certain cells in male mice causes them to mate with males.
2:16:07
Atrazine's impact on frogs raises concerns about endocrine disruptors
2:21:06
Neural circuits exhibit dynamic plasticity, especially across female life stages.

Chapters

Nirao Shah
00:00
Mice, Humans & Brain, Biological Conservation
02:11
Hormones, Nature vs Nurture
05:25
Biological Sex Differences, Chromosomes & SRY Gene, Hormones
07:13
Sponsors: Maui Nui & Eight Sleep
16:01
Androgen Mutations, Feminization & Masculinization
19:09
SRY Gene; Animals & Sexual Trans-Differentiation
22:04
Hormones & Biological Brain Differentiation
27:49
Congenital Adrenal Hyperplasia, Androstenedione; Stress & Pregnancy
31:22
Genes, Brain Differentiation & Sexual Identity; Congenital Adrenal Hyperplasia
35:56
Testosterone, Estrogen & Brain Circuits
43:37
Sponsors: AG1 & LMNT
47:27
Intersex Individuals, Castration
50:36
Female Sexual Behavior, Brain, Testosterone & Pheromones
52:23
Identify as Heterosexual or Homosexual, Difference in Hormone Levels?
57:58
Gender, Sexual Orientation & Hormones; Hormone Replacement Therapy
1:00:42
Aromatization; Steroid Hormones & Gene Expression
1:10:21
Kids & Changing Gender Identity
1:15:00
Sexual Behavior, Refractory Period & Male Brain, Tacr1 Cells
1:19:05
Sponsor: Function
1:21:31
Hypothalamus, Dopamine, Prolactin, Cabergoline, Libido, Dopamine
1:23:19
Brain Circuits, Aggression & Sexual Behavior
1:27:05
Refractory Period; Age, Testosterone & Libido
1:32:40
Tacr1 Cells in Females, Periaqueductal Gray & Innate Behaviors
1:36:07
Parenting Behaviors & Brain Circuits; Pet Dogs
1:40:00
Oxytocin, Pair Bonding, Vasopressin; Biological Redundancy
1:43:12
Libido, Melanocortin, Tacr1 Neurons; GLP-1 Agonists, Clinical Trials; Kisspeptin
1:47:22
Female Brain Changes, Menstrual Cycle, Pregnancy, Menopause; Estrogen; Men & Hormone Fluctuation?
1:56:43
Life Experience Male vs Female, Sex Recognition, Behaviors & Context
2:04:10
Pain Management; Endocrine Disrupters, Gender Identity
2:16:05
Future Projects
2:21:03
Zero-Cost Support, YouTube, Spotify & Apple Follow & Reviews, Sponsors, YouTube Feedback, Protocols Book, Social Media, Neural Network Newsletter
2:24:29

Transcript

Andrew Huberman: Welcome to the Huberman Lab Podcast, where we discuss science and science-based tools for everyday life. I'm Andrew Huberman, and I'm a professor of neurobiology and ophthalmology at Stanford School of Medicine. My guest today is Dr. Nirao...