Sign in

Liz Siefert

@lizsiefert.bsky.social
538 followers 219 following 11 posts

PhD candidate UPenn | memory, sleep, and neuroethics | Brown '19 🧠 | She/Her

PostsRepliesMedia
Reposted by Liz Siefert
Seth Koslov @skoslov.bsky.social · 19/08/2026
New preprint! Posterior cingulate is often linked to memory in humans but decisions in monkeys yet there's little consensus about its functional neuroanatomy. We recorded LFPs+single units in humans during matched value and memory based decisions, finding convergence in dorsal, but not ventral, PCC.
biorxiv.org
33312
Reposted by Liz Siefert
Kari Hoffman @karihoffman.bsky.social · 30/07/2026
📣New paper! How does the sleeping brain help us to integrate new experiences while managing memories from the past? For his PhD work, @sabbaspoor.bsky.social recorded hippocampal ensembles in freely moving monkeys and found something unexpected. 🧵1/n www.nature.com/articles/s41... 🧪🧠📈👩‍🔬#OpenAccess
nature.com
Experience reorganizes content-specific memory traces in macaques - Nature Neuroscience
In macaques, old memories, relative to new ones, are supported by more stable and interconnected cell assemblies. New-biased and old-biased assemblies reactivate during overnight sleep and can sometim...
410440
Reposted by Liz Siefert
Dhairyya Singh @dhairyyasingh.bsky.social · 09/07/2026
Out today! Our (w/ @annaschapiro.bsky.social) review of the alignment between the C-HORSE model and the hippocampal structure learning literature. We find strong congruence with the model's key principles and propose several avenues for future investigation!
royalsocietypublishing.org
Evidence for complementary learning systems within the hippocampus
Abstract. Decades of research have established the hippocampus as central to episodic memory, but growing evidence suggests that it also contributes to str
23311
Reposted by Liz Siefert
Brett L. Foster @brettlfoster.bsky.social · 29/06/2026
Exciting new preprint from the lab, led by @lizsiefert.bsky.social , together with @annaschapiro.bsky.social. Findings help to clarify when hippocampal ripples occur across wake and sleep, better aligning human data with animal models.
0125
Reposted by Liz Siefert
Erin J. Wamsley 🧠📈😴 @wamsleylab.bsky.social · 29/06/2026
"Ripple occurrence consistently tracked low arousal: rates were maximal in NREM sleep, small-pupil wake states, and slow heart rate periods across sleep and wake... ripple-like activity outside the hippocampus showed an opposite modulation, increasing with high arousal."
biorxiv.org
Arousal state modulates human hippocampal ripples
Hippocampal ripples are transient, high-frequency oscillations linked to memory replay and consolidation. Ripples are well-characterized in rodents to occur during periods of behavioral inactivity (i....
0144
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 29/06/2026
A *super* exciting new paper from @lizsiefert.bsky.social!! Human hippocampal ripple rates track very closely with several indicators of low arousal, during both sleep and wake. This is probably the most compelling data I have ever been associated with.
06114
Liz Siefert @lizsiefert.bsky.social · 29/06/2026
New preprint! We show low arousal states promote hippocampal ripple genesis in sleep and wake. This bridges rodent work, where ripples predominate during sleep, with human studies reporting ripples during active behavior, identifying low arousal as a common mechanism www.biorxiv.org/content/10.6...
biorxiv.org
Arousal state modulates human hippocampal ripples
Hippocampal ripples are transient, high-frequency oscillations linked to memory replay and consolidation. Ripples are well-characterized in rodents to occur during periods of behavioral inactivity (i....
38842
Reposted by Liz Siefert
Sarah Solomon @sarahsolomon.bsky.social · 13/04/2026
Super excited to share this preprint! How do we disentangle underlying structure from the particular features of a learning episode to benefit future learning? We find that memory reactivation during sleep promotes this structure abstraction process. www.biorxiv.org/content/10.6...
biorxiv.org
16518
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 13/04/2026
We’ve got an exciting new thing to share! We have causal evidence (using TMR) that memory reactivation during sleep promotes abstract understanding of underlying structure, allowing transfer learning in a new domain with zero superficial feature overlap with the learned one.
112135
Reposted by Liz Siefert
Eitan Schechtman @eitans.bsky.social · 07/03/2026
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!
Isrw group photo
0236
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 15/01/2026
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
elifesciences.org
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.
314153
Reposted by Liz Siefert
Catrina Hacker @catrinahacker.bsky.social · 05/01/2026
🚨 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) 🧠🟦 🧠💻
biorxiv.org
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 ...
211534
Reposted by Liz Siefert
Bill Grueskin @bgrueskin.bsky.social · 14/12/2025
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...
browndailyherald.com
Live updates: Two deceased in active shooter incident at Brown University
Serving the Brown University community since 1891
322732686
Reposted by Liz Siefert
tyler bonnen @tylerbonnen.bsky.social · 25/11/2025
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 😊
a red building on UPENN's campus photographed during the fallthe Philadelphia skyline, with clear skies and autumn trees
2522745
Liz Siefert @lizsiefert.bsky.social · 16/11/2025
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!!
1174
Reposted by Liz Siefert
Brynn Sherman @brynnsherman.bsky.social · 19/09/2025
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
momentslab.org
Moments Lab
28548
Reposted by Liz Siefert
Eitan Schechtman @eitans.bsky.social · 29/08/2025
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
02012
Reposted by Liz Siefert
Brynn Sherman @brynnsherman.bsky.social · 24/07/2025
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...
osu.wd1.myworkdayjobs.com
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...
35852
Reposted by Liz Siefert
Zhenglong Zhou @neurozz.bsky.social · 16/07/2025
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
bit.ly
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...
06425
Reposted by Liz Siefert
Brynn Sherman @brynnsherman.bsky.social · 24/06/2025
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!
714430
Reposted by Liz Siefert
Simon Kern @skjerns.de · 16/06/2025
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 👇
25627
Liz Siefert @lizsiefert.bsky.social · 10/06/2025
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!!
091
Reposted by Liz Siefert
Dhairyya Singh @dhairyyasingh.bsky.social · 27/05/2025
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
osf.io
OSF
03011
Reposted by Liz Siefert
Allie Sinclair @asinclair.bsky.social · 17/05/2025
📣 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 ⤵️
3225316
Reposted by Liz Siefert
Allie Sinclair @asinclair.bsky.social · 13/05/2025
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/...
pnas.org
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 ...
415564
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 22/04/2025
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. 💜 🥲
1391
Reposted by Liz Siefert
Catrina Hacker @catrinahacker.bsky.social · 21/04/2025
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 🧪
upennglia.com
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]
1245
Reposted by Liz Siefert
Brains in Briefs @brainsinbriefs.bsky.social · 21/04/2025
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...
upennglia.com
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]
061
Reposted by Liz Siefert
Allie Sinclair @asinclair.bsky.social · 27/03/2025
📣 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
scienceimpacts.org
SCiMaP
21446225
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 06/03/2025
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!!)
0123
Reposted by Liz Siefert
Emily Meyer @emilymeyer.bsky.social · 14/01/2025
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/...
15715
Reposted by Liz Siefert
Marlie Tandoc @marlietandoc.bsky.social · 09/12/2024
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...
doi.org
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...
14720
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 25/11/2024
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...
direct.mit.edu
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...
311131
Reposted by Liz Siefert
Deepu Murty @vpmurty.bsky.social · 23/11/2024
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.
tobradpostle.bsky.social
Bluesky
614472
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 13/06/2024
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!!
02411
Liz Siefert @lizsiefert.bsky.social · 13/06/2024
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...
jneurosci.org
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...
1103
Reposted by Liz Siefert
Sarah Solomon @sarahsolomon.bsky.social · 11/06/2024
🚨Job alert! My new lab at Binghamton University is hiring a full-time lab manager ("assistant"). This is a great fit for a recent grad looking for cog/comp neuro experience before grad school. Details below, feel free to reach out with questions! binghamton.interviewexchange.com/jobofferdeta...
Text of the job description that can also be found on the application portal.
151
Reposted by Liz Siefert
Anna Schapiro @annaschapiro.bsky.social · 15/12/2023
Excited to share another lab paper out this week, from @lizsiefert.bsky.social!! We show that memory reactivation during sleep does not act holistically on all components of a memory! Unique features are enhanced at the cost of shared features, suggestive of a differentiation process.
22912
Liz Siefert @lizsiefert.bsky.social · 15/12/2023
New preprint! We use real-time TMR to show that sleep reactivation transforms object memories, enhancing certain features at the expense of others. W/ Sindhuja Uppuluri, Jianing Mu, @marlietandoc.bsky.social @jameswardantony.bsky.social @annaschapiro.bsky.social doi.org/10.1101/2023.12.14.571683
doi.org
Memory reactivation during sleep does not act holistically on object memory
bioRxiv - the preprint server for biology, operated by Cold Spring Harbor Laboratory, a research and educational institution
02211
Reposted by Liz Siefert
Jake Parker @jacob-a-parker.bsky.social · 12/11/2023
If you’d like to learn how suboptimal decision-making, choice variability, and individual differences can all reflect information-efficient inference, come to my poster at UU22 tomorrow, Monday morning from 8 am - 12 noon! #SfN23
092
Liz Siefert @lizsiefert.bsky.social · 11/11/2023
If you're at SfN and interested in memory reactivation during sleep, come check out my talk on Sunday morning! (8:45am, WCC 150) Part of an awesome nanosymposium on learning and memory led by @emilycowan.bsky.social #SfN23 #neuroskyence
0154
Reposted by Liz Siefert
Emily Meyer @emilymeyer.bsky.social · 11/11/2023
Come by my poster Sunday morning at #SfN titled "Investigating the capacity for tree shrew high-level vision"! Poster no. X1 #neuroskyence
0112
Reposted by Liz Siefert
Sarah Solomon @sarahsolomon.bsky.social · 10/11/2023
I'm recruiting PhD students to join my new cognitive neuroscience lab at Binghamton next fall! We'll use behavior, fMRI, and computational methods to explore how humans learn, represent, and flexibly use concepts in language and thought. If this excites you, too, please apply! tinyurl.com/42arf45f
tinyurl.com
Cognitive Psychology PhD | Psychology | Binghamton University
Learn how to apply to Binghamton University’s graduate program in Cognitive Psychology, which boasts a 96 percent employment rate upon completion.
152