Today’s update for Living on the Spectrum explores new neurological findings regarding brain wiring and subcortical regions, alongside critical reports on the ethical practices of autism clinics and the profound impact of hormonal changes on ADHD across the lifespan.
‘Push-pull’ recipe for neural wiring used in multiple brain regions
Molecular Guidance System
Researchers identified two molecules, teneurin-3 (TEN3) and latrophilin-2 (LPHN2), that coordinate to guide nerve fibers during brain development. TEN3 acts as an attractive force to stabilize correct neural connections, while LPHN2 provides a repulsive signal to prevent fibers from attaching to the wrong targets. This "push-pull" mechanism operates across the visual and auditory systems as well as the spinal cord.
Impact on Sensory Mapping
Disrupting these molecular cues results in misplaced connections and distorted sensory maps. These biological errors may explain the heightened sensory sensitivities frequently observed in autistic individuals. Future studies will examine whether autism-related variations in transcription factors interfere with these guidance molecules, leading to the atypical auditory and sensory processing characteristic of the condition.
Importance of looking beyond the cortex for brain regions and neural pathways that play a role in autism
Focus on the Thalamus and Striatum
Recent studies using single-cell spatial transcriptomics indicate that subcortical regions are more affected in autism than the cerebral cortex. Genes associated with profound autism show peak activity in the thalamus during mid-gestation. Additionally, chromosomal alterations like 16p11.2 lead to an overpopulation of inhibitory neurons in the striatum, a region responsible for movement and reward.
Future Therapeutic Directions
The research suggests that autism shares dysregulated pathways with other neuropsychiatric conditions, such as schizophrenia. Experts advocate for shifting focus toward specific neural circuits, particularly thalamocortical pathways, rather than the entire brain. Investigating sex-specific gene expression within these subcortical circuits may clarify why autism presents differently across the gender spectrum.
How oligodendrocytes may shape autism
Role of Myelin and White Matter
Oligodendrocytes, the support cells that insulate neurons with myelin, appear to play a central role in neurodevelopmental differences. Mutations in genes like CHD8 specifically within these cells lead to social behaviors and seizures in mouse models. Other genetic variations, such as those in PTEN, correlate with an overproduction of white matter and atypical myelin placement, affecting how quickly signals travel through the brain.
Therapeutic Windows
Because oligodendrocytes continue to develop into early adulthood and maintain high plasticity, they provide an extended timeframe for potential medical intervention. Treatments that promote myelination—similar to those currently used for multiple sclerosis—could eventually support improved brain function for individuals with specific genetic profiles.
How the Menstrual Cycle Impacts ADHD
The Estrogen-Dopamine Connection
Fluctuating hormone levels directly influence ADHD symptoms because estrogen helps regulate dopamine, the neurotransmitter responsible for focus and executive function. During the first two weeks of the menstrual cycle, rising estrogen levels often improve productivity. However, the drop in dopamine that accompanies rising progesterone in the premenstrual phase typically intensifies irritability and emotional dysregulation.
Lived Experience of Hormonal Shifts
Women with ADHD report significant declines in working memory and heightened sensory overload during specific phases of their cycle. These shifts often manifest as severe forgetfulness and anxiety that disrupt professional and family life. Many expressed concern that the permanent decline of estrogen during menopause would make these symptoms unmanageable.
When ADHD and Menopause Collide
Perimenopausal Challenges
Perimenopause often creates a crisis for neurodivergent women as declining estrogen causes established coping mechanisms to fail. This transition can trigger severe exhaustion, executive dysfunction, and may even unmask previously undiagnosed autism. For many, physical touch becomes painful due to intensified sensory processing differences during this period.
Treatment and Care Gaps
Research indicates that women with ADHD experience perimenopausal symptoms earlier and more severely than neurotypical women, often between ages 35 and 39. While Hormone Replacement Therapy (HRT) and Hormone Stabilization Therapy (HST) can restore cognitive balance and make ADHD medications more effective, many patients face resistance from medical providers. Only 24% of surveyed women found their doctors receptive to discussing these hormone-based interventions.
Short naps, long hours: How autism clinics squeeze Medicaid dollars out of preschoolers
Profit-Driven Therapy Practices
Reports indicate that some autism clinics are maximizing Medicaid billing by requiring preschoolers to attend intensive therapy for excessively long hours. To increase billable time, some facilities have reportedly reduced or eliminated nap times for young children. This practice stems from a reimbursement system that prioritizes the quantity of therapy hours over the developmental needs of the child.
Consequences for Children
The pressure to generate revenue through intensive therapy hours raises ethical concerns regarding child exhaustion and burnout. While providers face systemic pressure to maintain high billing rates, the resulting environment may prioritize profit over the well-being of the preschoolers receiving services.
When autistic kids grow up, Chapter 1: Those people
Systemic Research Gaps
The podcast "When autistic kids grow up" follows researcher Tempest McDonald as she highlights the lack of support for autistic individuals transitioning into adulthood. McDonald’s personal experience with a turbulent childhood informed her professional critique of the U.S. National Institutes of Health (NIH). She argues that current research and policy frameworks often discriminate against the needs of the adult autistic community.
Transition to Adulthood
The series focuses on the systemic failures that occur when the intensive supports provided to children disappear once they reach age 18. This "cliff" in services leaves many adults without the necessary resources for employment, housing, or continued healthcare, highlighting a significant disconnect between research funding and lived reality.
At 77, My Spark Refuses to Dim
Late-Life Diagnosis
Heidi Dellafera Eagleton, diagnosed with ADHD in her 60s, highlights the challenges and strengths of living with the condition at age 77. While ADHD-related inattentiveness contributed to physical injuries, such as a fractured patella from multitasking, it also provided the hyperfocus and energy necessary to complete a memoir during her recovery.
Resilience Through Creativity
Eagleton’s experience suggests that a late-life diagnosis can serve as a source of renewed purpose rather than just a label of impairment. By leaning into the creative aspects of her neurodivergence, she managed the physical and emotional hurdles of aging. She views her journey as a balance between managing the risks of impulsivity and embracing the resilience granted by her ADHD.
Podcast Transcript
Aaron: Hello everyone, welcome to the podcast. I’m Aaron.
Jamie: And I’m Jamie.
Aaron: In this episode, we’ve gathered some of the latest research and community discussions regarding neurodevelopmental differences—things like Autism, ADHD, and sensory processing. There’s a lot to get through, and some of it gets pretty deep into the biology of the brain, but it all connects back to the real-world experiences of families and individuals.
Jamie: It really does. What struck me about the recent reports is how we’re moving away from looking at the brain as just one big piece and starting to see the tiny, intricate "wiring" and the chemical changes that happen over a lifetime. It’s less about one single "cause" and more about how these different systems interact.
Aaron: I want to start with something that sounds like a construction project. I was reading about these molecules called Teneurin-3 and Latrophilin-2. Apparently, they act like a "push-pull" system for neurons? Jamie, for those of us who aren't in a lab, what does that actually look like in a developing brain?
Jamie: It’s a great analogy. Think of it as a GPS for nerve fibers. Teneurin-3 acts like a "keep going, you're on the right track" signal, helping connections stabilize. Latrophilin-2 is the "stay away" signal, preventing those fibers from ending up where they don't belong. When this push-pull balance is off, the brain's "sensory maps" get a bit distorted.
Aaron: So, if those maps are distorted, is that why a loud noise or a certain fabric might feel overwhelming for an autistic person? It’s like the signal is being delivered to the wrong "address" in the brain?
Jamie: That’s the working theory. If the auditory or tactile maps are misplaced or overlapping, the sensory input might be processed in a way that feels much more intense or confusing. And what's interesting is that researchers are now looking at the "basement" of the brain—the subcortical regions like the thalamus—rather than just the outer layer, the cortex, which is where most research used to focus.
Aaron: That’s a big shift, right? We used to think everything important happened on the surface. But now we’re hearing that the deep-seated "relay stations" like the thalamus might be where the real story is for profound autism.
Jamie: Exactly. The thalamus is like the brain’s switchboard. New studies using spatial transcriptomics—which is basically a way to map gene activity in specific cells—show that genes linked to autism are highly active in these deep regions during mid-gestation. It’s helping us realize that autism isn’t just one thing; it’s a variation in how these fundamental circuits are built from the very beginning.
Aaron: It makes me think about how we support people. If the wiring is that foundational, it really changes the conversation from "fixing" something to understanding how a person’s unique "map" works. But speaking of support, I saw a report that was quite upsetting—some clinics are being accused of cutting down on nap times for preschoolers just to bill more hours to Medicaid.
Jamie: That’s a very difficult conversation. There’s a tension between the need for intensive therapy and the basic needs of a child. When profit-driven models enter the picture, we see these ethical "gray areas" where a child’s exhaustion might be overlooked in favor of "billable hours." It’s a reminder that the system around the person matters just as much as the biology.
Aaron: It really points to the need for better advocacy as these children grow up. I was listening to a bit of Tempest McDonald’s story—she’s an autism researcher who has been very vocal about how the system treats autistic adults. She even challenged the NIH on discrimination. It feels like there’s a movement of researchers with lived experience who are finally saying, "The way you’re studying us doesn’t match our reality."
Jamie: And that’s vital because so much of our understanding is based on childhood. But these neurodevelopmental traits don't disappear at eighteen. We’re actually seeing some fascinating research now on how support cells in the brain—not just the neurons, but the "insulation" called myelin—continue to develop into early adulthood.
Aaron: You mean the oligodendrocytes? I’ve heard them called the "forgotten cells."
Jamie: That’s them. They create the white matter that helps signals travel smoothly. When genes like CHD8 or PTEN are involved, that insulation might be too thick, too thin, or in the wrong place. Because these cells are so "plastic"—meaning they can change based on the environment well into adulthood—it actually opens up new possibilities for therapies that don't just focus on the early years.
Aaron: That’s a hopeful note. It suggests the brain is much more adaptable over time than we once thought. But I have to say, for a lot of women, that "adaptability" feels more like a "perfect storm" when they hit midlife. We’ve had a lot of listeners asking about the link between ADHD and menopause.
Jamie: This is a huge area of concern that’s been overlooked for a long time. It boils down to the relationship between estrogen and dopamine. Estrogen actually helps regulate how dopamine works in the brain. So, when estrogen levels drop during perimenopause or even right before a period, dopamine levels can plummet too.
Aaron: Right, and for someone with ADHD who already has a "dopamine deficit," that’s like losing your last bit of fuel. I’ve heard women describe it as their coping mechanisms just... vanishing. They’ve managed their whole lives, and suddenly they can’t find their keys or finish a sentence.
Jamie: It can be very scary. Many women find that their ADHD symptoms—forgetfulness, emotional dysregulation—become much more severe. Some even find that sensory issues they’ve had under control suddenly become unbearable. A soft sweater might suddenly feel like sandpaper.
Aaron: And the timing is tough, too. The research says women with ADHD might hit perimenopause earlier, sometimes in their late 30s. If their doctor doesn't understand the link between hormones and neurodivergence, they might just get dismissed as being "stressed" or "depressed."
Jamie: There’s a significant gap in care there. Community feedback shows many providers aren't ready for this conversation. But for those who do find a specialist, things like Hormone Replacement Therapy or even just adjusting the timing of ADHD medication can make a world of difference. It’s about recognizing it’s a medical shift, not a personal failing.
Aaron: That reminds me of a story we saw about Heidi Dellafera Eagleton. She wasn’t even diagnosed with ADHD until her 60s! She’s 77 now, and she talked about how she had a serious fall because she was multitasking—that classic ADHD restlessness—but then she used her "hyperfocus" to write a whole memoir during her recovery.
Jamie: I love that story because it shows the "dual nature" we often talk about. There are real risks and challenges, like the physical accidents or the executive dysfunction, but there’s also this incredible resilience and energy. She called her diagnosis a source of renewed purpose.
Aaron: It’s a powerful perspective. Whether it’s a preschooler needing a nap, a researcher challenging the NIH, or a woman in her 70s finally understanding her brain, the theme seems to be the same: we need to look at the whole person, across their whole life, and respect the way their individual brain is wired.
Jamie: Well said. It’s about moving away from labels and toward understanding the mechanisms—whether that’s a "push-pull" molecule or a drop in estrogen—so people can get the specific support they need.
Aaron: We’ve covered a lot of ground today, from microscopic brain wiring to the complexities of the healthcare system and the lifelong journey of neurodivergence. If you want to dive deeper into any of these studies or the stories we mentioned, we’ve included all the summaries and original links on our episode page.
Jamie: Thanks for joining us for this conversation. It’s a lot to process, and it’s okay to have more questions than answers right now.
Aaron: Definitely. We’ll be back next time to keep exploring these topics with you. Take care, everyone.
Jamie: Goodbye.
References
- ‘Push-pull’ recipe for neural wiring used in multiple brain regions
- When autistic kids grow up, Chapter 1: Those people
- Short naps, long hours: How autism clinics squeeze Medicaid dollars out of preschoolers
- Importance of looking beyond the cortex for brain regions and neural pathways that play a role in autism
- How oligodendrocytes may shape autism
- When ADHD and Menopause Collide
- 4 Insights About ADHD & Perimenopause
- At 77, My Spark Refuses to Dim
- How the Menstrual Cycle Impacts ADHD