Matthew Logie

Excited to share our paper (with @jzacks.bsky.social), now out in JEP:LMC!

Event boundaries sometimes disrupt temporal order memory in list-based paradigms—but what happens in narratives with more complex structures that better resemble real life?

✨ Link: psycnet.apa.org/record/2027-...

Human hippocampal theta–gamma coupling coordinates sequential planning during navigation

Impressive study from Dan Bush's Lab at UCL:

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

6/6 Memory for 'when' was temporally compressed and temporal distances between items in memory varied based on the nested event structure and not on the total number of seconds.

5/6 Interestingly we also found larger distances between pairs of images occurring within eight-image rooms than pairs occurring on either side of a room transition (event boundary). The boundaries provided a 'reset' for temporal distances.

4/6 Response times for placing the images from the first room were slower than images from the last room, suggesting a backwards scanning of memory.

3/6 We found variable temporal compression effects based on the number of items per room. The first images and the first rooms were place later in time (positive) while the last images and the last rooms were placed earlier in time (negative).

2/6 We presented sequences of images in virtual rooms, six rooms each containing four images or three rooms each containing eight images within the same total number of seconds. Participants were asked to remember the 'what' 'when' and 'where'.

1/6 Happy to share our new paper with @grassocamille.bsky.social and @virginievanw.bsky.social: "Nested contextual change and the temporal compression of episodic memory". www.biorxiv.org/content/10.6...

(Perceptual) space and time are warped by the gravity of objects and events in their vicinity. There's been a flurry of work recently documenting examples of this gravity, all resulting in some really neat illusions.

@brynnsherman.bsky.social and I discuss all of those, here:

rdcu.be/e5SWo

"Increasing memory set size during duration encoding consistently produced greater underestimation and stronger central-tendency effects"

New preprint: Inference over hidden contexts shapes the geometry of conceptual knowledge for flexible behaviour.

In this pre-reg study, our core claim was that we don’t just learn stimulus-reward. We infer hidden context and that inference re-wires attention and neural state space on the fly.
1/8

By applying analysis techniques they had been using to study the brain to their lab meetings, @lindadouw.bsky.social and team identified ways to boost communication among people with very different backgrounds.

By @emilysingerneuro.bsky.social

#neuroskyence

www.thetransmitter.org/methods/how-...

*** New paper just out! ***

Francesca Bellotti and @dbueti.bsky.social take a closer look at how speed and time interact when we judge visual stimuli.

Read it here: jov.arvojournals.org/article.aspx...

#TRFpaper

Delayed, Reduced and Redundant: Information Processing of Prediction Errors during Human Sleep During sleep, the human brain transitions to a ‘sentinel processing mode’, enabling the continued processing of environmental stimuli despite the absence of consciousness. We employed advanced informa...

An absolutely precision-oriented read from the wider team of @canalesjohnson.bsky.social and co. on the information processing of prediction errors--an already high feat. They go further, relating it to environmental stimuli across sleep stages.

New preprint alert! 📢 Event segmentation allows us to parse continuous experience into meaningful events. Working memory (WM) is suggested to play a key role in this process, but how?

osf.io/preprints/ps...

Adaptive episodic memory: how multiple memory representations drive behavior in humans and nonhumans | Physiological Reviews | American Physiological Society Episodic memory is a declarative long-term memory of a specific past experience. As such, it is multifaceted, encompassing both the objective and subjective components of that experience. These components can be flexibly represented at different levels of granularity, from precise, context-specific details to generalized, gistlike representations. In this review, we suggest that 1) multiple representations of an episodic memory at different levels of granularity are simultaneously encoded into a memory trace and 2) the relative weighting of these representations determines the extent to which a memory is reconstructed or reproduced at retrieval. We propose that this representational flexibility drives adaptive behavior by prioritizing reconstruction or reproduction depending on the age of the memory, its relationship to prior knowledge, current attentional goals or task demands, and individual differences. Drawing on research in humans and nonhuman animals, we show a close correspondence between psychological and neural representations of a memory across encoding, consolidation, and retrieval. Specifically, we discuss how hippocampal activity in humans and engram formation and activation in rodents support the reproduction of detailed memory representations, whereas schema formation across species, mediated by the medial prefrontal cortex, facilitates reconstruction and generalization to guide behavior. Finally, we consider how species- and individual-level differences shape episodic memory representations. By integrating findings across species, we illustrate how the correspondence between neural and psychological representations enables multiple memory representations to balance stability and flexibility, ultimately driving adaptive behavior.

How do memories guide behaviour?

Multiple memory representations, from detailed to gist-like, let us flexibly reconstruct or reproduce past experiences to behave adaptively across species.

Now out in Physiological Reviews with Morris Moscovitch, Melanie Sekeres & @brianlevine.bsky.social!

Excited to share a new paper spearheaded by the wonderful @baror-shira.bsky.social:
tinyurl.com/bd8xdcum
@erc.europa.eu @nathumbehav.nature.com

We test the link between serial dependence (as an index of continuity) and event boundaries (indexing segmentation). A few key findings in the thread:

How eight initiatives are tackling neuroscience’s gender gap In honor of today’s International Day of Women and Girls in Science, The Transmitter spoke with eight women working to bolster their ranks in the field.

Happy International Day of Women and Girls in Science! For its 11th year, we’re celebrating eight women neuroscientists working toward gender equality in the field.

By Paige Miranda

#WomeninScience #neuroskyence

www.thetransmitter.org/qa/how-eight...

The Queen of Science – The woman who tamed Laplace. In a footnote to my recent post on the mythologizing of Ibn al-Haytham I briefly noted the inadequacy of the terms Arabic science and Islamic science, pointing out that there were scholars included…

Scientific translator, science writer, astronomer, Mary Somerville was born 16 December 1780 #histsci #womeninscience

thonyc.wordpress.com/2014/10/14/t...

Bluesky Map Interactive map of 3.4 million Bluesky users, visualised by their follower pattern.

I made a map of 3.4 million Bluesky users - see if you can find yourself!

bluesky-map.theo.io

I've seen some similar projects, but IMO this seems to better capture some of the fine-grained detail

Spontaneous Oscillatory Activity in Episodic Timing: An EEG Replication Study and Its Limitations Episodic timing refers to the one-shot, automatic encoding of temporal information in the brain, in the absence of attention to time. A previous magnetoencephalography (MEG) study showed that the rela...

📣New paper out! We successfully replicated our previous work (Azizi et al., 2023), demonstrating that alpha activity is a marker of contextual changes during resting-state.

w/ R. Bordas and @virginievanw.bsky.social
shorturl.at/bKAFp

The next article in the #PhiMiSci special issue on structuralism is out: “Linking the structure of neuronal mechanisms to the structure of qualia” by A. Maier and N. Tsuchiya. It surveys the key literature leading up to a structural approach to consciousness and rates the current state of the filed.

Passage of time in the brain, in the mind, both?

Commentary on @lapate.bsky.social recent work
#drift #fmri #human #time
Please,👇 if we missed relevant observations in the field!

w/ @vigano.bsky.social @beneuroscience.bsky.social & R. Bordas
@sfnjournals.bsky.social
@brainthemind.bsky.social

A very nice commentary. I would also recommend the following paper showing a 'reset' of gamma band drift at event boundaries.
elifesciences.org/reviewed-pre...

The Association between Oscillatory Burst Features and Human Working Memory Accuracy Abstract. Oscillatory power across multiple frequency bands has been associated with distinct working memory (WM) processes. Recent research has shown that previous observations based on averaged powe...

Working memory is an interplay between different rhythms. It is not steady state like we used to think back in the 20th century.
The Association between Oscillatory Burst Features and Human Working Memory Accuracy
doi.org/10.1162/JOCN...
#neuroscience

Now out in iScience: Alpha power indexes working memory load for durations

How does the brain store 'durations' in working memory?

👇👇👇

www.cell.com/iscience/ful...

Collaborative effort between @brainthemind.bsky.social and MNE-Python/INRIA.

Collaborative groups often outperform single individuals in complex problem solving. A new paper examined how to create the right incentives to promote this kind of collective intelligence.
www.pnas.org/doi/epdf/10....

Neural activations and representations during episodic versus semantic memory retrieval - Nature Human Behaviour In this Stage 2 Registered Report, Tibon et al. showed using fMRI that neural activity associated with successful memory retrieval did not differ between semantic and episodic memory, using a task wit...

Finally: the fantastic #registeredreport from bsky-less Roni Tibon is out: www.nature.com/articles/s41... showing less difference between #episodic vs. #semantic #memory than one might have thought.

Proud to have contributed a tiny part to this great paper.

Aperiodic 1/f noise drives ripple activity in humans - Nature Communications How aperiodic 1/f noise drives ripple activity in human brain and impacts on ripple detections is not fully understood. Here authors show that ripple detections should be driven by the 1/f noise, whic...

Ripple oscillations are central for memory and sleep.

But ripple detection in humans remains challenging. Here we introduce a simulation approach in @natcomms.nature.com as common ripple detectors mainly pick up 1/f noise and not genuine oscillations

👇
www.nature.com/articles/s41...

#neuroskyence

🚨 New preprint! What if individual alpha peak frequency—often treated as a global marker of brain function and clinical phenotypes—actually reflects a mixture of independent alpha rhythms with distinct frequencies and neural origins? That’s what @davidpascucci.bsky.social and I suggest here. #EEG