Liz Siefert

Isrw group photo

Still pumped up from yesterday's international sleep replay workshop! Provocative talks, engaging discussion groups & enthusiastic engagement by all attendees from undergrads to full professors. Stay tuned for info on the next one. And now, on to @cnsmtg.bsky.social. Check out our lab's posters!

A unifying account of replay as context-driven memory reactivation A context-driven memory model simulates a wide range of characteristics of waking and sleeping hippocampal replay, providing a new account of how and why replay occurs.

Really thrilled that this paper led by @neurozz.bsky.social is now published in its final version in @elife.bsky.social!!

This is a memory-focused (as opposed to RL-focused) account of the detailed characteristics of forward and backward awake and sleep replay!

elifesciences.org/articles/99931

Neural representations of visual memory in inferotemporal cortex reveal a generalizable framework for translating between spikes and field potentials Translating neurophysiological findings requires understanding the relationship between common measures of brain activity in animals (spiking activity) and humans (local field potentials, LFP). Prior ...

🚨 New preprint!

Why do some insights from spikes translate to field potentials while others don't? In this paper we compare visual memory representations in spikes and LFPs to propose a general framework that answers this question.

www.biorxiv.org/content/10.6...

🧵 (1/10)

🧠🟦 🧠💻

Live updates: Two deceased in active shooter incident at Brown University Serving the Brown University community since 1891

Kudos to the Brown University students who are posting continuous live updates, spaced just minutes apart, on the campus shooting. A lot of grace and professionalism under immense pressure.

www.browndailyherald.com/article/2025...

a red building on UPENN's campus photographed during the fall

the Philadelphia skyline, with clear skies and autumn trees

starting fall 2026 i'll be an assistant professor at @upenn.edu 🥳

my lab will develop scalable models/theories of human behavior, focused on memory and perception

currently recruiting PhD students in psychology, neuroscience, & computer science!

reach out if you're interested 😊

Additional plug for my talk, at 8:45am, examining the relationship between arousal state and hippocampal ripples in both sleep and wake states! In close collaboration with @yvonnechen.bsky.social 👁️😴🧠 #SfN

At SfN and interested in 'neuronal dynamics underlying memory'?? Come check out the nanosymposium (NANO011) that @catrinahacker.bsky.social and I are chairing tomorrow (Sunday) from 8-11:30am. So many awesome folks sharing their research, spanning work in rodents, NHPs, and humans!!

Moments Lab

Last month, I launched my lab at Ohio State. Our lab website is now live, and we're recruiting graduate students this cycle! If you're interested in the cognitive (neuro)science of learning & memory, please reach out!

www.momentslab.org

For >5 years, the International Sleep Replay Workshops (ISRW) have brought together scientists studying sleep & memory. The next ISRW will be on March 6th in Vancouver (before @cogneuronews.bsky.social). Follow the link for details and to join the mailing list.
isrw.bio.uci.edu

Pls repost! #sleep

Research Associate Screen reader users may encounter difficulty with this site. For assistance with applying, please contact hr-accessibleapplication@osu.edu. If you have questions while submitting an application, pleas...

I'm recruiting a lab manager for my soon-to-be-launched lab at Ohio State! If you know of any recent grads who may be interested both in helping to build the lab and in developing skills in the cognitive neuroscience of memory, please share!

osu.wd1.myworkdayjobs.com/en-US/OSUCar...

A gradient of complementary learning systems emerges through meta-learning Long-term learning and memory in the primate brain rely on a series of hierarchically organized subsystems extending from early sensory neocortical areas to the hippocampus. The components differ in t...

Excited to share a new preprint w/ @annaschapiro.bsky.social! Why are there gradients of plasticity and sparsity along the neocortex–hippocampus hierarchy? We show that brain-like organization of these properties emerges in ANNs that meta-learn layer-wise plasticity and sparsity. bit.ly/4kB1yg5

Incredibly excited and grateful to share that I’ll be starting a lab at The Ohio State University this(!) fall! My lab will study human learning and memory, with related interests in sleep, stress, and time perception. More info soon, but do get in touch if you’re interested in joining!

preprint alert 🚨
1/ Can we accurately detect sequential replay in humans using Temporally Delayed Linear Modelling (#TDLM)? In our recent study, we could not find any replay and decided to dig deeper by running a hybrid simulation with surprising results. Link to preprint & details below 👇

Amazing & comprehensive work by @brynnsherman.bsky.social demonstrating how sleep reactivation supports the integration of new info into existing knowledge. So excited to see this out!!

New preprint! Statistical structure skews object memory toward predictable successors. Model simulations show how this bias can arise from the backward expansion of hippocampal representations.
w/co-first @codydong.bsky.social , @marlietandoc.bsky.social & @annaschapiro.bsky.social osf.io/yuxb6_v1

📣 It's official: I'm super excited to share that I'll be joining Rice University as an Assistant Professor in the Department of Psychological Sciences!

Lab will launch in Summer 2026— I'll be recruiting over the next year, so please spread the word! Short thread ⤵️

Behavioral interventions motivate action to address climate change | PNAS Mitigating climate change requires urgent action at individual, collective, and institutional levels. However, individuals may fail to act because ...

What motivates people to take action and share info about climate change? We tested 17 psychological interventions in a tournament—Discover the winners in our new paper! Out now in @pnas.org w/ @falklab.bsky.social, @michaelemann.bsky.social, & team. Thread ⤵️ 1/9

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

Presenting DR. Tandoc!!! @marlietandoc.bsky.social It has been such a joy to get to work with this brilliant, creative, and fun person. Marlie was key to building both our lab's research program and its community from the very beginning, and we are going to miss her immensely. 💜 🥲

I had so much fun writing this summary of awesome work done by @lizsiefert.bsky.social @annaschapiro.bsky.social and co.!

Learn about how your brain transforms memory during sleep (and at least one reason getting sleep is so important!): www.upennglia.com/briefs/bib-m...

#neuroskyence #SciComm 🧪

How does the brain transform our memories during sleep? — GLIA Or technically, Memory reactivation during sleep does not act holistically on object memory [See original abstract on Pubmed]

And next, NGG student Liz Siefert @lizsiefert.bsky.social tested whether reactivating certain memories during sleep in humans can help with their recall later. Current NGG student Catrina Hacker @catrinahacker.bsky.social breaks it down. www.upennglia.com/briefs/bib-m...

📣 Across the U.S., cuts to federal funding for health research are projected to cause losses of $16B and 68,500 jobs. How will YOUR area be impacted?

Excited to share SCIMaP, a website that our team has created to communicate the impact of funding cuts. #PsychSciSky #MedicalSky

scienceimpacts.org

Hey Philadelphia see you TOMORROW 11AM CITY HALL!!!!

(And if you're a Penn person, @pennmindcore.bsky.social is hosting poster-making and donut-eating beforehand!!)

Excited to share my first first-author paper out now in PNAS! By comparing retinotopically-defined visual areas in macaques and humans, we found that evolutionary expansion is reflected in the size, not number, of visual areas. #neuroskyence #neuroscience
www.pnas.org/doi/10.1073/...

Object Feature Memory Is Distorted by Category Structure Abstract. Memory systems constantly confront the challenge of capturing both the shared features that connect experiences together and the unique features that distinguish them. Across two experiments...

New paper out! Memory for object features is warped according to their role in a category, w/ features shared across category-mates misremembered as more similar. We explored the phenomenon in our NN model of the hipp. w/ @annaschapiro.bsky.social & @codydong.bsky.social doi.org/10.1162/opmi...

Rapid Learning of Temporal Dependencies at Multiple Timescales Abstract. Our environment contains temporal information unfolding simultaneously at multiple timescales. How do we learn and represent these dynamic and overlapping information streams? We investigate...

Very excited that this paper led by @cybellesmith.bsky.social is now out in JoCN!! We show how humans and recurrent neural nets can learn statistics unfolding at multiple timescales rapidly and concurrently.

direct.mit.edu/jocn/article...

I want to draw attention to a special issue that Lila Davachi and I put together to memorialize our friend and colleague Sarah DuBrow. It’s full of papers inspired by her work and her being from a group of collaborators, friends, and fans! Thanks @bradpostle.bsky.social for helping make this happen.

Super excited to share this one, out now in J Neuro! Memory reactivation during sleep does not act holistically on object memory. Led by the amazing @lizsiefert.bsky.social!!

This Week in The Journal How Sleep Transforms Our Memories Elizabeth Siefert, Sindhuja Uppuluri, Jianing Mu, Marlie Tandoc, James Antony, and Anna Schapiro (see article e0022242024) Memory consolidation is a process that ...

Very excited for this work to be featured in #JNeurosci “This Week in The Journal”!! www.jneurosci.org/content/44/2...

Memory Reactivation during Sleep Does Not Act Holistically on Object Memory Memory reactivation during sleep is thought to facilitate memory consolidation. Most sleep reactivation research has examined how reactivation of specific facts, objects, and associations benefits the...

Out now in J Neurosci! Using real-time TMR, we find that sleep reactivation transforms memory, improving certain memory features at the cost of others. W/ Sindhuja Uppuluri, Jianing Mu,@marlietandoc.bsky.social @jameswardantony.bsky.social @annaschapiro.bsky.social
www.jneurosci.org/content/44/2...