Peter Kirk

Peter Kirk

@peterakirk.bsky.social

Neuroscientist & Psychologist at the NIH | Anxiety & Mood Disorders, Naturalistic Neuroimaging, Subjective Experience, Physiology, Development | Disclaimer: all views/posts are my own.

820 followers719 following59 posts

Peter Kirk reposted

Peter Kirk reposted

Just published - what happens in the brain when people offload memories into external reminders? Using fMRI decoding, we found that the corresponding neural trace fades until it becomes statistically absent. www.nature.com/articles/s41... 🧵...

nature.comCognitive offloading weakens the neural representation of to-be-remembered information - Scientific ReportsScientific Reports - Cognitive offloading weakens the neural representation of to-be-remembered information

Peter Kirk reposted

Peter Kirk reposted

New paper alert! 📣📣 In this work, we investigated the origins of somatic symptoms – a common and debilitating feature of anxiety and depression. 'Anxiety is associated with the persistence of conditioned somatic sensations over time'

osf.ioOSF

Peter Kirk reposted

🧠 New work showing prominent and widespread 𝘪𝘯 𝘷𝘪𝘷𝘰 pre-synaptic terminal reductions in people with schizophrenia.🧠 nature.com/articles/s41... Strongest effects in left hemisphere, but synaptic loss didn't track with MRI grey matter alterations, but did align with..👇1/4

nature.comWidespread synaptic density loss in schizophrenia follows molecular and network architecture - Molecular PsychiatryMolecular Psychiatry - Widespread synaptic density loss in schizophrenia follows molecular and network architecture

Peter Kirk reposted

🎉 Excited to share our publication in PNAS! 🎉 What happens when our stream of consciousness turns towards the body? Our fMRI study of 536 individuals finds that 'body-wandering' is associated with patterns of brain connectivity, physiology, affect, and mental health: www.pnas.org/doi/full/10....

Peter Kirk reposted

🧠 Resting-state fMRI is often treated as the gold standard for studying the brain’s intrinsic organization. But is it actually the best way to estimate functional architecture? We tested this directly. 🧵1/8

Our analyses revealed tripartite associations between anxiety symptoms, participants descriptions of the movie, and brain activity in insula, default mode, and dorsal attention regions. These findings underscore the utility of movie paradigms in research on subjective emotional experiences. 2/2

Patients with and without anxiety watched an anxiety-inducing movie during fMRI. Afterward, they provided open descriptions of the movies. Their responses underwent natural language processing to quantity semantic content. 1/2

Peter Kirk reposted

Excited to share our new paper in Scientific Reports. Pre-scanning state anxiety was associated with reduced rs-FC in the DMN in a trait-anxious community sample, underscoring how children’s MRI scanning experiences may be associated with rs-FC. Grateful for mentorship from @UCRiverside and @NIH.

Peter Kirk reposted

Peter Kirk reposted

Want to learn about FMRI visualization, processing and group analysis? Join us for the next AFNI Bootcamp (Jan. 27-29, 2026) for a fun few days of theory and interactive practicals. Details+registration for this virtual course: afni.nimh.nih.gov/bootcamp

Peter Kirk reposted

This paper had a pretty shocking headline result (40% of voxels!), so I dug into it, and I think it is wrong. Essentially: they compare two noisy measures and find that about 40% of voxels have different sign between the two. I think this is just noise!

Eiko Fried@eikofried.bsky.social

Would love to hear expert views on this paper. It appears to show that the operationalization of brain activity the field has relied on for 3 decades—the BOLD response—is not actually a sensible measure of brain activity. www.nature.com/articles/s41...

Peter Kirk reposted

Excited to share our manuscript about BrainEffeX, a tool for exploring fMRI effect sizes. Includes why we made it, how to use it + contribute, and how we made it. @sneuroble.bsky.social @psychonetrics.bsky.social @alexkfischbach.bsky.social @nichols.bsky.social @dscheinost.bsky.social & MINDS Lab

Aperture Neuro@apertureohbm.bsky.social

Shearer et al. introduce an interactive web application for exploring fMRI effect maps: doi.org/10.52294/001... @halleeshearer.bsky.social @sneuroble.bsky.social @ohbmossig.bsky.social #OpenDatasets #SpecialIssue

Peter Kirk reposted

Data only shows associations. Turning those into claims about mechanism or causation? That requires a Rosetta Stone of prior knowledge + theory. Resting-state fMRI is purely observational; correlation is its currency. From this, plenty of "theoretical toys" about brain function can be built...

bioRxiv Neuroscience@biorxiv-neursci.bsky.social

Resting-State fMRI and the Risk of Overinterpretation: Noise, Mechanisms, and a Missing Rosetta Stone https://www.biorxiv.org/content/10.1101/2025.09.16.676611v1

Peter Kirk reposted

Peter Kirk reposted

Peter Kirk reposted

Peter Kirk reposted

Launched in 2023, Imaging Neuroscience is now firmly established, with full indexing (PubMed, etc.) and 700 papers to date. We're very happy to announce that we are able to reduce the APC to $1400. Huge thanks to all authors, reviewers, editorial team+board, and MIT Press.

Peter Kirk reposted

Excited to share that our work is now published in Imaging Neuroscience! 🧠🥳 We show how aging reshapes the brain’s language and memory networks, revealing striking shifts in hemispheric specialization across the lifespan. Check it out @imagingneurosci.bsky.social

Imaging Neuroscience@imagingneurosci.bsky.social

New paper in Imaging Neuroscience by Elise Roger, Gaelle E. Doucet, et al: When age tips the balance: A dual mechanism affecting hemispheric specialization for language doi.org/10.1162/IMAG...

Peter Kirk reposted

Check our latest work ‘Linking Subjective Experience of Anxiety to Brain Function using Natural Language Processing’. Our analyses link movie-evoked brain activity and subsequent interview recordings in a pediatric sample with and without anxiety disorders (doi.org/10.31234/osf...).

Check our latest work ‘Linking Subjective Experience of Anxiety to Brain Function using Natural Language Processing’. Our analyses link movie-evoked brain activity and subsequent interview recordings in a pediatric sample with and without anxiety disorders (doi.org/10.31234/osf...).

Peter Kirk reposted

🚨 New #preprint: The molecular and cellular underpinnings of human brain lateralization 🔗 doi.org/10.1101/2025... 🧠 We identify an acetylcholine-norepinephrine axis underlying functional lateralization, along with mitochondrial and cellular correlates. 🧵1/9👇 #neuroskyence

doi.orgThe molecular and cellular underpinnings of human brain lateralizationHemispheric specialization is a fundamental characteristic of human brain organization, where most individuals exhibit left-hemisphere dominance for language and right-hemisphere dominance for visuosp...

Peter Kirk reposted

"To make a meaningful contribution to #neuroscience, #fMRI must break out of its silo." My latest attempt to convince you of the importance of multi-scale approaches for the study of the human brain.

The Transmitter @thetransmitter.bsky.social

Until recently, in-vivo brain imaging has largely been absent from… integrative efforts, limiting the opportunities to contribute our discoveries, theories or vision toward a comprehensive view of brain function, writes @avramholmes.bsky.social. #neuroskyence www.thetransmitter.org/future-of-fm...

Peter Kirk reposted

Is interoceptive sensing unified across internal organs? 🫀🫁 Our high-powered psychophysical study (N=241) suggests not. Bayesian evidence indicates interoceptive processes are largely modality-specific—challenging the idea of a unitary interoceptive sense. 🔗 Read here: osf.io/preprints/ps...

Our report on "The Relations Among Anxiety, Movie-Watching, and In-Scanner Motion" is out now in Human Brain Mapping. In short: even anxiety-evoking movies reduce pediatric in-scanner movement compared to 'rest', highlighting its benefit for developmental neuroimaging. doi.org/10.1002/hbm....

Peter Kirk reposted

The Holmes Lab is #hiring a full-time research assistant/predoc! Our work focuses on functional brain networks-- how they change, how they are impacted in psychiatric illness, and much more! Unfortunately, we cannot sponsor visas for this position. Please rt and reach out if you're interested👀

Peter Kirk reposted

🧠 📌 FINAL CALL FOR POST-DOC IN NEUROIMAGING 🧠 📌 Do you have (or will have soon) a PhD in Psychology, Neuroscience or Neuroimaging? Are you looking for a post-doc in neuroimaging? Do you want to join a friendly lab in a fab Psychology department? Do you wish to live in gorgeous Norwich?

Peter Kirk reposted

Peter Kirk reposted

I thought this was the conclusion of the original BWAS paper? Either way it's both imaging pipelines (specifically driving features from population average atlases) and noisy target phenotypes

Simon Eickhoff@sbe.bsky.social

The limiting factor for MRI based prediction of behavioral traits may be neither the imaging nor the pipeline or learning algorith but rather the reliability of the target phenotypes Thought provoking work my Martin Gell et al: www.nature.com/articles/s41...

Peter Kirk reposted

Peter Kirk reposted

#Neuroimaging crowd, hear me out! 👀 Did you ever want to add #EyeTracking to your #fMRI study but found it too much hassle? Got existing data you’d love to add eye tracking to? Consider trying out *MR-based eye tracking* (i.e. inferring gaze from eye voxels)! Here is a 🧵 with a few options!👇 1/9

Peter Kirk reposted

Working on new film project (INSCAPES 2!!). 💥. Does anyone have an audio recording of a modern, commonly used EPI sequence they could share? The composer builds her score around the types of sounds that occur inside the scanner, so I'm trying to get a few for her to listen to...🎵