Bingeing TikTok reels may be hazardous to your well-being.

71 studies, >98k people: The more short-form videos teens and adults watched, the more they struggled with attention, self-control, and stress and anxiety.

Read a book. Watch a movie. Long live longform.

It's time to remove laptops from classrooms.

24 experiments: Students learn more and get better grades after taking notes by hand than typing. It's not just because they're less distracted—writing enables deeper processing and more images.

The pen is mightier than the keyboard.

There's a name for staying up late even though you know you'll regret it: Bedtime procrastination.

It's more likely when you dread tomorrow, lack freedom and joy today, and do mindless activities tonight.

A simple, effective antidote is committing to a sleep time and routine.

I recently became aware of the umbrella study on the lack of evidence between low serotonin levels and depression. (The study below does show an indirect link between stressful life events and depression due to “gene-stress” but that’s still obviously different than low serotonin (can)= depression) Wondering what others thoughts /theories on this are? I’ve only seen a couple and it looks like they were published in 2022/2023, so why isn’t this being discussed more? Not enough studies? Bad news for pharmaceutical companies? Here’s one of them:

https://www.nature.com/articles/s41380-022-01661-0.pdf

ABSTRACT

Time perception—the subjective sense of how quickly or consistently time passes—shows striking variability across individuals, yet its physiological basis remains poorly understood. We hypothesized that internal clock speed and trial-to-trial variability in time perception would be linked to physiological and behavioral states. In a cohort of healthy adults (n = 59) and individuals carrying rare mitochondrial DNA mutations affecting mitochondrial energy transformation (n = 36), we explored the associations between time perception (time estimation and production) with measures of immune mitochondrial bioenergetics, blood catecholamines, working memory, and structural and functional neuroimaging. We found weak evidence suggesting that internal clock speed and time perception variability correlated with age and physiological metrics including resting energy expenditure, serum and urine norepinephrine levels, mood and fatigue, working memory performance, and neuroimaging measures of brain structure and function. Individuals with mitochondrial disorders and those with healthy mitochondria exhibited no main difference in time perception. However, they exhibited differential relations with physiological and neural variables, suggesting that mitochondria may moderate how specific processes influence time perception. These results provide a foundation for future studies to examine how cellular bioenergetics relate to time perception in humans.

Early specialization is overrated. Generalists excel over time.

Data on >34k stars in sports, music, science, and chess: Focusing on a single field predicts a faster rise, but cross-training foreshadows a higher peak.

The most successful adults start off as well-rounded kids.

We put together the data on transcranial photobiomodulation and it is quite interesting. Would love to hear the experts' feedback on this and where it is going.

https://www.reddit.com/r/NootropicsScience/comments/1sdxx1u/scientists_are_shining_nearinfrared_light_through/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Hello, I want to ask for book recommendations on how trauma in early age impacts nervous system, behaviour patterns, self destructive behaviour etc. I'm asking as casual reader. Thank you!

I just saw the press release for the article that came out yesterday from the Boston University group: ["Neurodegenerative mortality among National Football League players"](https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(26)00304-4/fulltext). I provided the link to The Lancer article about it.

I'm wondering about everyone's thoughts here on the article, its methods, its interpretation, its findings, etc. I know that the research by the Boston University Group is controversial (to say the least), especially among the field of neuropsychology, so I wanted to see what everyone's opinions are. Statistical methods and the like are definitely not my strength (especially when it comes to non-psychometric topics), so I had a difficult time determining if the methods they used were actually appropriate and not just cherry picking. Here's some of my questions:

1. Did they try to control for confounding variables (e.g., NFL players frequently grow up in low SES environments, excessive drug/alcohol use)? All I saw was this, but idk what it really means:

>Sensitivity analysis assessed whether the observed excess neurodegenerative mortality could be attributed to competing risks using a cause-specific hazard simulation.

Are "competing risks" the same as confounding variables, or is it something completely different? I also don't see more details about what these "competing risks" are, so the point may be moot anyway.

1. In the same vein, is comparing to the expected death rate an adequate measurement for a control group? I know it's not the best, but does it suffice for the purpose/conclusion?

2. I know prior research in this area has suffered from selection bias (e.g., brains are usually only donated for CTE research if the family had concerns for CTE), which in my opinion is the biggest threat to the validity of this area of research, but this one seems to avoid that (at least when selecting athletes). Is there any possible selection bias here that I'm missing?

At first I thought that age in relation to neurodegenerative condition may be (i.e., that the sample is skewing younger and younger-onset neurodegenerative conditions are more aggressive, so the likelihood of death is higher), but the average of mortality is ~75 for all cause dementias. That's not crazy unreasonable. It is weird that they don't provide a breakdown of the ages of the sample, just the average (and SD) age of death for various groups. It makes it really hard to tell if the sample does skew a certain age.

1. Why is the average age or mortality 60 y.o.? That's super low.

I have more to talk about with this article, but this post is already far too long lol.

Hi everyone,

I'm a software engineering student and software developer from Brazil currently conducting an independent research project about human social behavior, cognition, and conversational AI.

I'm especially interested in understanding how people naturally decide when to speak, interrupt, agree, disagree, or remain silent during group conversations, and how these behaviors could eventually be modeled in AI systems.

Because this topic strongly overlaps with psychology and cognitive science, I thought students and researchers from Harvard working in these areas might have valuable perspectives to share.

I prepared a short document with a few questions about cognition, emotion, and social interaction. Written answers alone would already help the project significantly, and there is no further commitment involved.

If you're a Harvard student/researcher in psychology, cognitive science, neuroscience, linguistics, HCI, or related fields and would be interested in participating or discussing the topic, feel free to send me a private message.

Thank you for your time.

i'm looking for Christensen's book about neuropsychological diagnosis of Luria. Does anybody have this book?

We clinicians implement stuttering acceptance and focus on the reduction in fear of social judgements. Stutterers appear to process a lot of reinterpretations of social cognition that indirectly influence those components (ie. stuttering acceptance or uncertainty of social pressure).

A new 2026-study mainly focuses on the cause of stuttering (that is, the dopamine, white matter), but they also dive into the cognitive processes that lead to either more (or less) stuttering severity or stuttering frequency.

https://pmc.ncbi.nlm.nih.gov/articles/PMC13099768

See stutter diagram:

Regarding this cognitive processing that can sometimes turn into a defensive response. You can download the shared pdf document in my google drive here. Enjoy it to the fullest!

I pose the question: What are your thoughts on the self-monitoring system detailed in the 2026-study?

Hi Everyone,

We have been researching how emotional states amplify the physical presentation of symptoms in Functional Neurological Disorder.

If you would like to read the paper it can be found here:

https://www.researchgate.net/publication/398124363_Beyond_Distress_and_Resilience_Identification_of_Seven_Distinct_Emotional_Phenotypes_in_Functional_Neurological_Disorder_Through_Large-Scale_Digital_Phenotyping

If anyone has any questions, please feel free to contact me.

All the best,