Louise B. Bjerrum

Does exposure to artificial light in the morning reduce reaction time variability during cognitive control processing? Being alert and attentive is essential for cognitive control processing, as it facilitates the detection of conflicting stimuli that require resolution. Exposure to daytime artificial light increas...

Paper 3 of the PhD is now out in Chronobiology International: doi.org/10.1080/0742... We found that a 2-h morning exposure to short-wavelength light contributed to lower reaction variability during the processing of cognitive conflicts🧠

One week ish since paper 2 of the PhD was published in Scientific Reports, just got an email notifying me that paper 3 has been accepted for pub in Chronobiology Int! Just one major revision this time around🎉

New publication, experimental study testing the acute effects of artificial light on alertness in the morning💡 www.nature.com/articles/s41... Main findings: faster reaction times and fewer attention lapses while being exposed to 🔵"blue" and 🔴"red" light. No sign. effect on reaction time variability.

Medical breakthroughs in 2025 ... and a happy new year.

New post!

There was a lot of innovation in medicine and biomedical research this year, and I've tried to summarize the biggest ones in this blogpost.

Medical breakthroughs in 2025. Plus a serious note at the end.
www.scientificdiscovery.dev/p/medical-br...

My 3 year old thought the moon looked pretty cool this morning. Can't disagree with that

Here is a godawful joke in chart form to ruin your Christmas season 🤪🎄

Some good f***ing news in the everyday chaos I'm trying to navigate (that is, balancing a new job and finishing the PhD thesis all while co-parenting two kids under the age of 3): paper 2 of the PhD was finally accepted after 3 major revisions involving a total of 8 reviewers🤯 It's been a ride

Appearantly, where I currently work, people 3D print games🤓

Let’s Git started | Happy Git and GitHub for the useR Using Git and GitHub with R, Rstudio, and R Markdown

Out of necessity for some tasks at my new job, I have put in an effort to truly learn git - like, properly this time around😅 And I can happily state that I FINALLY get the still photo shown below. Has been a mystery up until now

happygitwithr.com

DNA scientist James Watson has a remarkably long history of sexist, racist public comments “People say it would be terrible if we made all girls pretty,” he said in 2003. “I think it would be great.”

Hey folks, as news of Watson's demise spreads, please don't set aside his weighty legacy of misogyny and racism. He was truly among the worst of us. www.vox.com/2019/1/15/18...

GitHub - hadley/genzplyr: dplyr but make it bussin fr fr no cap dplyr but make it bussin fr fr no cap. Contribute to hadley/genzplyr development by creating an account on GitHub.

Do you teach #rstats? Do your students complain about how lame and old-fashioned dplyr is? Don't worry: I have the solution for you: github.com/hadley/genzp....

genzplyr is dplyr, but bussin fr fr no cap.

New job appreciation post pt.2: this week, I've spent most of my time learning Shiny in R💻 I'm having a great time🤩

Happy logical Halloween

That was certainly not the case as a PhD student at the University.

One week into my new role as an advisor/consultant in data analysis and statistics at the Center of expertise in medical quality registries in the Western Regional Health Authority (Norway). It's quite deliberating the fact that I'm mentally "done" with work when I leave the office around 4PM.

After “fast food”
And “fast fashion”

Have we entered the era of “fast science”?

Whoa—my book is up for pre-order!

𝐌𝐨𝐝𝐞𝐥 𝐭𝐨 𝐌𝐞𝐚𝐧𝐢𝐧𝐠: 𝐇𝐨𝐰 𝐭𝐨 𝐈𝐧𝐭𝐞𝐫𝐩𝐫𝐞𝐭 𝐒𝐭𝐚𝐭 & 𝐌𝐋 𝐌𝐨𝐝𝐞𝐥𝐬 𝐢𝐧 #Rstats 𝐚𝐧𝐝 #PyData

The book presents an ultra-simple and powerful workflow to make sense of ± any model you fit

The web version will stay free forever and my proceeds go to charity.

tinyurl.com/4fk56fc8

PhD thesis related pt.2: procrastination continues. Taking a theoretical deep dive into beta regression rather than writing about circadian entrainment in the Introduction section💁‍♀️ Hopefully, I will get the chance to discuss statistics/quant.methods during the defense🤞

PhD thesis related: SO much more fun discussing and criticizing (own) methods rather than working on the Introduction. I guess this is how procrastination manifests. Could have been worse, I could have started making some random R figures for instance💁‍♀️

Capturing trial-by-trial variability in behaviour: people with Parkinson’s disease exhibit a greater rate of short-term fluctuations in response times - Translational Psychiatry Translational Psychiatry - Capturing trial-by-trial variability in behaviour: people with Parkinson’s disease exhibit a greater rate of short-term fluctuations in response times

Working on the discussion section of the PhD thesis, where I (among other things) discuss ways of estimating intra-individual RT variability. This paper recently came out, featuring one of my co-supervisors: www.nature.com/articles/s41... Graph theory looks like an interesting estimation approach🤓

Sunday with my little man☕️

An arrow with a LaTeX equation

Trigonometric functions and a unit circle

A bivariate change model with structured residuals

A hierarchical model of cognitive abilities

Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other.
wjschne.github.io/ggdiagram/ar...

Not sure how little ole me got @rmkubinec.bsky.social, @chelseaparlett.bsky.social and @matti.vuorre.com to write a thing with me, but it happened! We wrote a Beta tutorial showcasing Beta and extensions of Beta (like ordered Beta). A preprint is available here: osf.io/preprints/ps....

Reevaluating the role of education on cognitive decline and brain aging in longitudinal cohorts across 33 Western countries - Nature Medicine In a large cross-national study, education was linked to better memory and larger brain volumes but not to slower cognitive or brain decline with age, suggesting that the association reflects early-li...

New study out in Nature Medicine: Education does not protect against age-related decline of memory. Read more here: Reevaluating the role of education on cognitive decline and brain aging in longitudinal cohorts across 33 Western countries www.nature.com/articles/s41...

What’s in a correlation? Correlation may not imply causation, but let’s just ignore that for a second. Correlations are standardized effect size metrics and as such have some quirks by design. These are benign enough when you...

New blog post! Calculating a correlation is easy enough. But let's say you calculated two of them and they happen to differ. What follows from that? Turns out there are too many moving parts for an easy answer.

www.the100.ci/2025/07/28/w...

make_tile() works as a charm, however, I can't get snap_tile() to work properly. Should the path specified in output_path() have another format than usual?😅 I'm using Windows, so my path would be something like "C://User//folder//subfolder//temp_hexsession//example_hexout.html""

Create a tile of logos for loaded packages Creates a responsive HTML file with tiled hex logos for all loaded packages in a session, which can be saved as a static screenshot in png format.

Want to visualize the R packages you have used in an analysis, e.g. for a presentation of research results? Recently came across the {hexsession} package made by @liomys.mx, so easy to use and the output looks great hexsession.liomys.mx

I cannot be convinced there exists a better title than "ItJustAintDopeToDropTheSlope.pdf" (which is how the .pdf on OSF is called).

Experimentology cover: title and curves for distributions.

Experimentology is out today!!! A group of us wrote a free online textbook for experimental methods, available at experimentology.io - the idea was to integrate open science into all aspects of the experimental workflow from planning to design, analysis, and writing.

"Simpson's gender-equality paradox" surely deserve some award for best title 👑
The gender-equality paradox seems really central to some narrative people have constructed (and successfully sold). I absolutely wouldn't be surprised if it turned out 100% confounding.>

www.pnas.org/doi/10.1073/...