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Pravesh Parekh

@parekhpravesh.bsky.social
155 followers 343 following 21 posts

Postdoctoral researcher | Neuroimaging | Genetics | Machine learning | Psychiatry | Progressively dystopian

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Reposted by Pravesh Parekh
Damien Fair @drdamienfair.bsky.social · 15/08/2026
The HBCD Study Data Release 2.1 is here 👇🏾 3,500+ children followed from pregnancy through early childhood: MRI, dMRI, resting-state fMRI, EEG, biospecimens incl. genetics, wearables, and rich behavioral + environmental data. New in 2.1: Olink inflammation markers + the ERICA assessment.
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Pravesh Parekh @parekhpravesh.bsky.social · 17/06/2026
“Motion insensitive resting state analysis” (MIRA) - meet me at #OHBM2026 at poster 2400 today and tomorrow to talk about a new way of performing motion correction for resting state fMRI!
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Pravesh Parekh @parekhpravesh.bsky.social · 14/06/2026
Pleased to share that FEMA-Long is now published in PLOS Genetics! FEMA-Long, an efficient mixed-effects modeling method, includes modeling unstructured covariance, spline and spline interactions, and performing longitudinal GWAS to discover time-dependent genetic effects doi.org/10.1371/jour...
doi.org
FEMA-Long: Modeling unstructured covariances for discovery of time-dependent effects in large-scale longitudinal datasets
Author summary Most large-scale datasets have complexities such as repeated measures, related individuals, or other dependencies across samples, preventing the use of standard regression approaches fo...
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Pravesh Parekh @parekhpravesh.bsky.social · 14/06/2026
I will be presenting tricks and tips for "Efficient large-scale statistical analyses in the big data era" today at the educational session "The Research Lifecycle: A Primer on Open and Sustainable Science Practices" at #OHBM2026. Happy to discuss! Course material here: github.com/parekhpraves...
github.com
GitHub - parekhpravesh/efficientAnalyses: Code and tutorials demonstrating how to perform large-scale statistical analyses in a computationally efficient manner
Code and tutorials demonstrating how to perform large-scale statistical analyses in a computationally efficient manner - parekhpravesh/efficientAnalyses
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Paul Taylor @afni-pt.bsky.social · 09/06/2026
Job ad (1/2): Postdoc fellowship in the AFNI group (SSCC, NIMH, NIH, USA). FMRI/MRI methods dev, software design, statistics, analysis, data viz, quality control, machine learning and more! Please see: discuss.afni.nimh.nih.gov/t/job-ad-pos... I am happy to chat at OHBM+Brainhack. Please share!
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Fiona Tribe @fionatribe.bsky.social · 23/04/2026
Yes, Swiss scientist Fritz Zwicky coined the term “dark matter” which is impressive, but he also coined the term “spherical bastard” to describe people who are bastards no matter which way you look at them, and I think that should be celebrated more.
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Cameron Blevins @cblevins.bsky.social · 03/04/2026
This is so, so well-articulated.
People call this friction "grunt work." Schwartz uses exactly that phrase, and he's right that LLMs can remove it. What he doesn't say, because he already has decades of hard-won intuition and doesn't need the grunt work anymore, is that for someone who doesn't yet have that intuition, the grunt work is the work. The boring parts and the important parts are tangled together in a way that you can't separate in advance. You don't know which afternoon of debugging was the one that taught you something fundamental about your data until three years later, when you're working on a completely different problem and the insight surfaces. Serendipity doesn't come from efficiency. It comes from spending time in the space where the problem lives, getting your hands dirty, making mistakes that nobody asked you to make and learning things nobody assigned you to learn.
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Katie Mack @astrokatie.com · 03/04/2026
More context on this #Artemis II image: * This is the night side, lit by moonlight. You can see city lights in Spain & Portugal, & a sliver of day at lower right * The Sun is entirely behind Earth, which makes it a kind of solar eclipse, but w/ Earth doing the eclipsing instead of the Moon: ☀️🌍🚀🌕
A full disc image of Earth, as seen from the Orion Crew Module. The planet is a pale blue, swirling with white clouds and glowing slightly lighter blue in place from reflected light. At lower left, a large brown landmass is Africa, with Spain and Portugal with twinkling lights where the planet curves. At top right, auroras glow in a thin green glow, just barely separated from the planet's surface. Earth is set against the black of space (pic: NASA/R.Wiseman)
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Dr. Natasha Rajah, Ph.D. @mnrajah.bsky.social · 06/03/2026
Really sick of AI being forced down everyone’s throat. AI can be a useful tool for some activities (mostly improving efficiency on monotonous tasks). But the sales pitch is insane & the idea that if you’re not integrating AI you are going the way of the 🦕 is insulting.
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Steve Smith @fmrib-steve.bsky.social · 25/10/2025
For people using the @ukbiobank.bsky.social UKB RAP cloud system for brain imaging analyses: In order to make RAP much easier to use, we have created a Docker which is easy to install and gives you a graphical desktop, FSLeyes and the HCP wb_view. docs.google.com/document/d/1...
docs.google.com
Imaging-friendly docker for UK Biobank RAP
An Easy Docker for Brain Imaging Visualisation on UKB RAP Paul McCarthy1 Stephen Smith1 1FMRIB, OxCIN, NDCN, Oxford University, UK Queries: email paul.mccarthy@ndcn.ox.ac.uk and stephen.smith@ndcn....
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Reposted by Pravesh Parekh
Adam Sharp @adamcsharp.bsky.social · 17/12/2025
A thread of how to say “nobody asked you” from around the world, starting with this one… A Lithuanian way of telling someone to mind their own business is ne tavo kiaulės, ne tavo pupos. It means “not your pigs, not your beans.”
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Pravesh Parekh @parekhpravesh.bsky.social · 05/09/2025
Motion Insensitive Resting-State Analysis (MIRA): a new way to perform motion correction that effectively removes the confounding effect of motion on the rsfMRI derived correlation matrices! Meet me at poster F13 and at the flash talk session today at #Flux2025 to find out more about this!
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Reposted by Pravesh Parekh
Timo B. Roettger @timoroettger.bsky.social · 02/07/2025
New paper out 🚨 in BMC Medical Research Methodology We assessed the prevalence of transparency-related practices in epidemiological secondary analyses for the Norwegian mother, father, and child cohort (MoBa). shorturl.at/604hn
bmcmedresmethodol.biomedcentral.com
Transparency in epidemiological analyses of cohort data a case study of the Norwegian mother, father, and child cohort study (MoBa) - BMC Medical Research Methodology
Background Epidemiological research is central to our understanding of health and disease. Secondary analysis of cohort data is an important tool in epidemiological research but is vulnerable to pract...
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Lucina Uddin @lucinauddin.bsky.social · 27/06/2025
The ABCD Study 6.0 release is finally here! 🧠 Apply for data access here @theabcdstudy.bsky.social www.nbdc-datahub.org
nbdc-datahub.org
NBDC Data Hub
NIH Brain Development Cohorts (NBDC) Data Sharing Platform: Unifying ABCD and HBCD data management in one powerful platform.
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Pravesh Parekh @parekhpravesh.bsky.social · 27/06/2025
Motion Insensitive Resting-State Analysis (MIRA): meet me at poster 1595 at #OHBM2025 to discuss a new way of performing motion correction for resting state fMRI that effectively removes the confounding effect of motion on rsfMRI derived correlation matrices!
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Reposted by Pravesh Parekh
Ali Rigby @neuromusicnerd.bsky.social · 25/06/2025
Stoked to be attending #OHBM2025 this week with our UCSD / JCVI team! If you’re here, be sure to stop by my poster to see some cool work from our lab using GAMMs: 📅 W/Th June 25th/26th 🧠 "Nonlinear age trajectories of subcortical microstructural and morphometric changes in the ABCD study"
Brisbane cityscape with the Brisbane sign in the foreground
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Pravesh Parekh @parekhpravesh.bsky.social · 25/06/2025
Meet me at #OHBM2025 poster 689 today/tomorrow to discuss using Fast and Efficient Mixed-Effects Algorithm (FEMA) for mixed-effects modeling with unstructured covariance and splines, perform longitudinal GWAS, and discover time-dependent genetic effects! www.biorxiv.org/content/10.1...
biorxiv.org
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Pravesh Parekh @parekhpravesh.bsky.social · 01/06/2025
Led by the incredible @gauravbhalerao.bsky.social
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The ABCD Study® @theabcdstudy.bsky.social · 22/05/2025
Coming June 2025! We are excited to launch the NIH Brain Development Cohorts (NBDC) Data Hub. This new data ecosystem will host & facilitate access to data from the Adolescent Brain Cognitive Development (ABCD) Study & the HEALthy Brain and Child Development (HBCD) Study. 1/13
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Pravesh Parekh @parekhpravesh.bsky.social · 16/05/2025
Introducing FEMA-Long for high-dimensional large-scale mixed-effects modelling! Includes modelling unstructured covariance, non-linear effects using splines, time-dependent effects with spline interactions, and longitudinal GWAS with time-dependent genetic effects! www.biorxiv.org/content/10.1...
biorxiv.org
FEMA-Long: Modeling unstructured covariances for discovery of time-dependent effects in large-scale longitudinal datasets
Linear mixed-effects (LME) models are commonly used for analyzing longitudinal data. However, most applications of LME models rely on random intercepts or simple, e.g., stationary, covariance. Here, w...
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Lucina Uddin @lucinauddin.bsky.social · 31/03/2025
FYI, if you want to be prepared to apply for the next ABCD Study data release, prepare for these new NIST security requirements 🧠: @ohbmofficial.bsky.social abcdstudy.org/scientists/d...
abcdstudy.org
Data Sharing - ABCD Study
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Ben Bolker @bbolker.bsky.social · 01/04/2025
#lirpaloof Since it's already 2025-04-01 for most of the world ... a slightly updated version of the `celebrate` package: `remotes::install_github("bbolker/bbmisc/celebrate")`. (Description: Celebrate your successes and mourn your failures.) Now supports `htest` objects!
celebrate              package:celebrate               R Documentation

Audio 'announcements' when printing model summaries

Description:

     The only function of this package is to augment the printing of
     model summaries with appropriate sound effects based on whether
     you have achieved the magical p<0.05 level of significance for at
     least one variable (not including the intercept - we have to try
     to be a _little_ bit sensible ...)

Details:

     Sounds are taken from <http://freesounds.org>

     To set an alpha-level different from 0.05, you can specify
     ‘options(celebrate.alpha = <value>)’

        • fanfare: user primordiality,
          <https://www.freesound.org/people/primordiality/sounds/78823/>
          (CC BY 3.0)

        • trombone: user kirbydx,
          <https://www.freesound.org/people/kirbydx/sounds/175409/>
          (CC0)

Examples:

     ## Not run:
     
     m1 <- lm(speed~dist,cars)
     m2 <- lm(Income~Population,data.frame(state.x77))
     summary(m1)
     summary(m2)
     ## chi-squared test
     M <- as.table(rbind(c(762, 327, 468), c(484, 239, 477)))
     dimnames(M) <- list(gender = c("F", "M"),
                         party = c("Democrat","Independent", "Republican"))
     (Xsq <- chisq.test(M))  # Prints test summary
     boring <- matrix(c(6,5,4,5), nrow = 2)
     (chisq.test(boring))
     ## End(Not run)
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Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 21/03/2025
Did you know that all the fine artisanal memes from my stats lectures are available in the course repo? Reuse and remixing freely encouraged github.com/rmcelreath/s...
GLMM meme: cat on left licking himself labeled GLM; tiger on right in same posture labeled GLMMthis is your brain [egg]
this is regression [frying pan]
this is your brain on regression [egg frying in pan]
any questions?elton john meme: RESULTS SECTION (left) METHODS SECTION (right)terminator meme:
What's your mom's job? STATISTICIAN
Is it okay to replace missing values with zeros?
Sure honey that sounds fine
Your foster parents are dead
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Frank Harrell @f2harrell.bsky.social · 09/03/2025
Dive into stat modeling&applications, relaxing assumptions, predictive accuracy, preserving information, imputation, model validation, Bayesian models, causal specification+many controversial topics: Regression Modeling Strategies course May 15-16, 19-20 hbiostat.org/doc/rms/4day.html #StatsSky
hbiostat.org
RMS
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Adriana Guatame-García @adriguatame.bsky.social · 06/03/2025
A friend included this anti-acknowledgement section on her PhD thesis. She also added the proposition: “Systematic bullying and undermining of girls and women in STEM starts early on and is the reason why they do not stay in science and related fields.” Absurd we still need to go through this 🧪👩‍🔬
There have been people less than helpful in my journey here. I wanted to acknowledge those too, bc I know I am not unique in this experience.
No thank you to the physics study assoc that made me sing songs about how women couldn't study physics without sleeping with the professor, the day I stepped into university life. No thank you to the 5th year physics student that decided to assign me a stripper name within the first minute of meeting me in the physics coffee corner in my first year. No thank you to the technician that was responsible for onboarding me on the use of the cluster in my third year who raised his eyebrows and asked me if that meant I was some sort of computer girl. No thank you to the senior researcher that sent me utterly inappropriate texts after a conference, then proceeded to apologise months later by telling me they had not been meant for me anyway so no hard feelings remain hopefully And no thank you to him for attending every conference I've been to since. No thank you to the people who told me that it was surprising that I was doing a PhD since I was a girl. No thank you to the man who mistook me for a coffee lady at a conference, and after having to correct him two times that I did not work there, responded with you should consider it. No thank you to the researcher that asked me what I was wearing underneath my outfit during a conference. No thank you to the physicist who declared to a room full of other physicists that biologists don't know how to design an experiment. No thank you to the people who have called me scary instead of strong and intimidating instead of intelligent.
And finally, no thank you to the exec board of the TU Delft, whose knee-jerk reaction to being held up a mirror about the social safety at the university, was to sue the party holding up the mirror instead of looking at the problems they highlighted.
... You have made me feel like I do not belong in science & I cannot forgive you for that.
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Department of Imaging Neuroscience @imagingneuroucl.bsky.social · 24/01/2025
Happy 30th birthday year to SPM!! 🎈🍰 To get the party started, we are delighted to announce SPM 25.01, a major new version of the open-source neuroimaging software. Read the preprint to discover what's new arxiv.org/pdf/2501.12081 and download SPM for free from Github github.com/spm/spm/rele...
arxiv.org
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Caroline Bowen, Speech-Language Pathologist 🇦🇺🇳🇿🌻 @carolinebowen.bsky.social · 18/01/2025
REFUSE. (lexical stress)
A notice with a buff coloured background and bold dark brown printing in capital letters, pinned to a dark grey-green coloured door. The word REFUSE is in larger print than the rest of the notice. The notice reads:

REFUSE TO BE STORED IN BLACK PLASTIC SACKS AND PLACED IN THE CONTAINERS  PROVIDED.
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Andrew Gelman et al. @statmodeling.bsky.social · 17/01/2025
7 steps to junk science that can achieve worldly success statmodeling.stat.columbia.edu/2025/01/17/7...
statmodeling.stat.columbia.edu
7 steps to junk science that can achieve worldly success | Statistical Modeling, Causal Inference, and Social Science
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tal yarkoni @talyarkoni.com · 30/03/2024
 “people won’t take us seriously if we speak plainly about what we’re doing, so we have to smoke and mirror some fake math at them to get them to show us respect”.
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Carl T. Bergstrom @carlbergstrom.com · 13/01/2025
When I was a young man there were whispered rumors among the elders that they could remember their own elders talking about a time when getting grants had been a means for doing science, rather than vice versa.
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Dan Quintana @dsquintana.bsky.social · 09/01/2025
Are you an early career researcher at @uio.no? Next Wednesday at 1pm I’ll be running a career development workshop for UiO ECRs, in which I’ll cover how a “start-up of one” mindset can be used for navigating academic careers. For more details ⬇️
mn.uio.no
The Start-Up Scholar - The Faculty of Mathematics and Natural Sciences
Join us for an interactive workshop that has been designed to help PhD candidates, Postdoctoral Fellows and Early Career Researchers plan their careers using a start-up framework.
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Nonia Pariente @npariente.bsky.social · 19/12/2024
Yearly reminder that the world will not end if you don’t submit your paper or revision before the holidays. Editors are people too & need a break. The @plosbiology.org team in particular has done outstanding work this year & fully deserves it. We’re mostly off the next 2 weeks. Happy holidays!
media.tenor.com
a cartoon of minnie mouse sitting at a desk holding a pencil and a cup of coffee
Alt: a cartoon of minnie mouse sitting at a desk holding a pencil and a cup of coffee
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Piotr Jaholkowski @jaholkowskipiotr.bsky.social · 17/12/2024
New paper alert! Our paper 'Charting the shared genetic architecture of Alzheimer's disease, cognition, and educational attainment, and associations with brain development' is out in Neurobiology of Disease! @SFFNORMENT www.sciencedirect.com/science/arti...
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DrBreaky @drbreaky.bsky.social · 18/12/2024
The Brain Connectivity Workshop 2025 will be held just before #OHBM2025 on the paradise that is Minjerribah (North Stradbroke Island) a one hour ferry ride from Brisbane Registration will open shortly (cost to be <$600 for travel registration & accomodation) so please plan your flights accordingly
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Julia Strand @juliafstrand.bsky.social · 11/12/2024
Hi all! I'm looking for a short, accessible reading for 1st year UGs that covers: 1) contributors to the replication crisis(e.g., p-hacking, publication bias, researcher degrees of freedom) 2) initiatives to address it (e.g., preregistration, sharing data and code, registered reports). Any tips?
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PHD Comics @phdcomics.com · 07/12/2024
How long it takes...
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Frank Harrell @f2harrell.bsky.social · 04/12/2024
Very interesting paper on confidence interval theory and misconceptions #StatsSky #Statistics
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Oded Rechavi @odedrechavi.bsky.social · 07/12/2024
Abstract Vs. Results
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