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Darius Valevicius

@dariusliutas.bsky.social

270 followers 140 following 540 posts

Restless neuroscientist and occasional artist. PhD candidate at Université de Montréal. Interests include: Emotion, critical psychiatry, trauma, psychophysiology, history and phil of science, painting, drawing, music, game development dariusliutas.com

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Darius Valevicius @dariusliutas.bsky.social · 1d

Little view of Montreal at dusk yesterday

Darius Valevicius @dariusliutas.bsky.social · 2d

Or a discord server for people wanting to talk shop in their spare time? If some folks show interest I can throw one together

Darius Valevicius @dariusliutas.bsky.social · 2d

I felt the part about scientific conversations taking the backseat to logistical and "academic lifestyle" conversations. Honestly the latter bores me to tears most of the time ;-; time to start a journal club I guess?

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Darius Valevicius @dariusliutas.bsky.social · 5d

That was an initial thought I had, that EDA spiking/sudomotor nerve firing might correlate with the phase of low frequency BOLD oscillations. But I wonder why that would be?

Darius Valevicius @dariusliutas.bsky.social · 6d

Also @blaisefrederick.bsky.social

Darius Valevicius @dariusliutas.bsky.social · 6d

Breath holding in anticipation? Or neuronally induced anticipation signal? Why does the EDA spike seem to trigger/coincide with a crash in GS? Paging @danielhandwerker.bsky.social @practicalfmri.bsky.social

Paper in question: doi.org/10.1016/j.ne...

Darius Valevicius @dariusliutas.bsky.social · 6d

Physio question for #neuroskyence: This figure shows that global BOLD signal is already increasing before the onset of electrodermal spikes (t=0), and falls rapidly afterwards. I get the same pattern in my dataset (also for event-related analysis, GS peaks at t=0). What are potential explanations?

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Darius Valevicius @dariusliutas.bsky.social · 10d

I guess that is one way to put it 😅

Darius Valevicius @dariusliutas.bsky.social · 13d

Not exactly sure how to put this but I guess I'm wondering how much of a disconnect there is between the phenomenology of peripheral vision and how we think about it conceptually, and how that's affected by mistaking beliefs for percepts

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Darius Valevicius @dariusliutas.bsky.social · 13d

Do we know how much is "filling in" and how much is just beliefs about what ought to be there? I recall someone arguing that the blind spot phenomenon was proof of top down predictive processing. But to me, it just registers as an absence or lack, not that anything has been "filled in".

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Darius Valevicius @dariusliutas.bsky.social · 13d

Dovetails well with this recent work: bsky.app/profile/tsbo...

Taylor Bolt @tsbolt.bsky.social · May 7

First post on an exciting new manuscript online today @natneuro.nature.com - in collab with @lucinauddin.bsky.social and Catie Chang. We take a fresh look at the physiological dynamics associated with the global signal 🧠 ...

www.nature.com/articles/s41...

Read here:
rdcu.be/ek01F

Autonomic physiological coupling of the global fMRI signal

Nature Neuroscience - The brain and body are necessarily connected. Here the authors show that brain blood flow and electrical activity are coupled with systemic physiological changes in the body.

rdcu.be

Darius Valevicius @dariusliutas.bsky.social · 13d

"The findings support our reframing of arousal from a discrete, one-dimensional state to a structured, organism-wide process that continuously unfolds in an abstract multidimensional mathematical space."

Has Platonism gone too far?

Cool paper though :)

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Darius Valevicius @dariusliutas.bsky.social · 23d

I noticed a jump from mixed selectivity to multifunctionality in this discussion - does a complex tuning curve imply a node with multiple functions? Or a node with a function that is recruited in multiple contexts?

Darius Valevicius @dariusliutas.bsky.social · 23d

"The Trading Game" is great pop econ. But yeah this balance is something that's been on my mind a lot, all my aspirations to help people by understanding the brain / the psyche start to pale the more broke we all get...

Darius Valevicius @dariusliutas.bsky.social · 24d

Could be a motor metaphor, e.g. when feeling "up" you feel buoyant (I know you'll appreciate that term) and have a spring in your step, when feeling "down" you can't seem to muster up the energy to rise out of bed?

Neurologically it must have something to do with SEEKING system tone..?

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Darius Valevicius @dariusliutas.bsky.social · 24d

And these days we also use it to refer to a non-symptomatic feeling/emotion 😛

Btw, the term "autism" was originally coined to refer to a symptom of schizophrenia, as recently as the 1910s. Big semantic shift!

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Darius Valevicius @dariusliutas.bsky.social · Sep 6

Thanks for reaching out to include us! An intimidating but fun opportunity :)

Darius Valevicius @dariusliutas.bsky.social · Sep 6

Which in my code is motivated by my need to minimize cognitive load, and in brains I imagine is motivated by the need to conserve resources by minimizing distances for frequent signals

Darius Valevicius @dariusliutas.bsky.social · Sep 6

This is always intuitive to me as someone who codes a lot (particularly for video games). Even if I write "spaghetti code" where many scripts are obliged to reference each other, there's still a method to the madness and individual scripts/objects maintain as much modularity as I can give them...

Darius Valevicius @dariusliutas.bsky.social · Aug 29

📌

Darius Valevicius @dariusliutas.bsky.social · Aug 29

📌

Darius Valevicius @dariusliutas.bsky.social · Aug 21

Thanks for the tip! It seems like this explanation might be the case, though I'll have to wait for the rest of the data to be sure.

Darius Valevicius @dariusliutas.bsky.social · Aug 18

I would liken this to the painting style where you make a very detailed underpainting or sketch which results in the top coat basically being paint-by-numbers :)

Darius Valevicius @dariusliutas.bsky.social · Aug 18

Another strat that I sometimes manage to use is to create an outline that has a bullet point for every single idea, statement, or thought, and edit that + arrange it into a logical sequence and hierarchy before turning it all into prose at the end.

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Darius Valevicius @dariusliutas.bsky.social · Aug 17

Since you're on the topic right now, maybe you can help me with this :)

bsky.app/profile/dari...