Lightnews — Scholar-powered news

Artin Arshamian @artinarshamian.bsky.social · Jul 25

I told Gemini that it gave me a reference that doesn't exist (literately: "the paper XXX does not exist"). It started arguing back! I had to prove it back-and-forth four times (!!) before it admitted the error! Now it named our chat: "Fictional References Accusation" How disturbing is that?

Artin Arshamian @artinarshamian.bsky.social · Jul 18

Came up with this exact system over the summer too! It is working great. I’ve killed every single project. Productivity is nonexistent. But still not sure how to break this to my collaborators😬

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Artin Arshamian @artinarshamian.bsky.social · Feb 27

Interesting question! We don’t think this effect is related to the physical movement. We believe it's entirely driven by brainstem preBötC interneurons (oscillators) even without breathing movement. Animal studies are needed to confirm, but I'd bet on it.

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Artin Arshamian @artinarshamian.bsky.social · Feb 27

theconversation.com/your-pupils-...

Your pupils change size as you breathe – here’s why this new discovery is important

It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and cognitive effects.

theconversation.com

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Artin Arshamian @artinarshamian.bsky.social · Feb 26

www.vice.com/en/article/b...

Breathing and Vision May Be Linked—Here’s Why That Matters

Researchers from the Karolinska Institutet have discovered a new connection between our vision and breathing.

www.vice.com

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Artin Arshamian @artinarshamian.bsky.social · Feb 21

The PRP is unique in that it is cyclical, ever-present, and requires no external stimulus. Check out our paper: physoc.onlinelibrary.wiley.com/doi/full/10....

The pupillary respiratory‐phase response: pupil size is smallest around inhalation onset and largest during exhalation

Abstract figure legend Across five experiments including 203 participants and a wide range of experimental conditions we demonstrate that pupil size fluctuates in a systematic manner over the course ...

physoc.onlinelibrary.wiley.com

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Artin Arshamian @artinarshamian.bsky.social · Feb 21

🧵Meet the Pupillary Respiratory-Phase Response (PRP): pupils constrict during inhalation and dilate during exhalation.

It is the fourth known mechanism influencing pupil size, alongside the pupillary light, near fixation, and psychosensory responses.

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Artin Arshamian @artinarshamian.bsky.social · Oct 21

Our new research reveals how the olfactory bulb (OB) and piriform cortex (PC) communicate odor valence in humans. plos.io/3NrX79q

The human olfactory bulb communicates perceived odor valence to the piriform cortex in the gamma band and receives a refined representation back in the beta band

How is information about odor valence communicated from the olfactory bulb to the olfactory cortex in humans? This neuroimaging study reveals when the subjective valence information is communicated, a...

plos.io

Artin Arshamian @artinarshamian.bsky.social · Jul 24

Our pre-print is gaining some attention. Hope the paper and the upcoming perception studies do not disappoint😀

www.newscientist.com/article/2438...

Your pupils change size as you breathe

Our pupils shrink and expand as we breathe in and out, but whether this affects vision is unclear

www.newscientist.com

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Artin Arshamian @artinarshamian.bsky.social · Jul 18

Great news and well deserved!

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Artin Arshamian @artinarshamian.bsky.social · May 16

5/5 The moral of the story: ALWAYS pre-register and replicate your cool findings if possible. Presume that you are wrong, even if your data tells you otherwise. #neuroskyence #psychology #neuroscience

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Artin Arshamian @artinarshamian.bsky.social · May 16

4/5 We pre-registered the finding and conducted a new experiment with 142 subjects (power of 0.91%). The result? No replication and substantial evidence for the null!

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Artin Arshamian @artinarshamian.bsky.social · May 16

3/5 An exploratory analysis revealed a beneficial effect on memory approximately 1 second after inhalation onset. The story could have ended here. With 72 subjects, this was a large study and a cool finding that could be easily published in good journal. But we didn’t stop there.

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Artin Arshamian @artinarshamian.bsky.social · May 16

2/5 In Experiment 1 (n=72), subjects engaged in a rapid serial visual presentation (RSVP) paradigm to test if memory performance differed between inhalation and exhalation. Results? No difference when stimuli were presented at the start of inhalation.

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Artin Arshamian @artinarshamian.bsky.social · May 16

1/5 Inhalation does not improve memory compared to exhalation - A cautionary tale. In the largest study to date (pre-registered, total n=214), we tested memory performance as function inhalation vs. exhalation onlinelibrary.wiley.com/doi/10.1111/... #neuroskyence

<em>Psychophysiology</em> | SPR Journal | Wiley Online Library

Using a task that engages oscillatory activity-dependent visual memory (fast processing of natural images), we find that the natural breathing cycle does not have a significant impact on recognition ...

onlinelibrary.wiley.com

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Artin Arshamian @artinarshamian.bsky.social · May 16

Exactly. I looked at Fig. 4A and just wondered if the “predicted values” that are not correlated with chronological age is just noise or if there is something real there that reflects biological aging. Does the Cam-CAN have other relevant info to compare with? Either way very cool study!

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Artin Arshamian @artinarshamian.bsky.social · May 14

Super cool! Is possible to compare the young people predicted to be old (e.g., 20 -> 50) and old predicted to be young (e.g., 80 -> 50) on other measurement? Like, e.g., underlying structural differences? That could be a marker for the difference between biological vs chronological aging.

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Artin Arshamian @artinarshamian.bsky.social · Apr 2

Have this on our next JC :)😀

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Reposted by Artin Arshamian

Micah G. Allen @micahgallen.com · Mar 29

Research shows breathing can change our exteroceptive & affective perception, but how? Pleased to share our latest study, led by my PhD student Malthe Brændholt w/ Daniel Kluger, where we investigated the cognitive mechanisms using computational modeling! 🧠📈 www.biorxiv.org/content/10.1...

Figure 1: schematic showing stimulus design, psychophysics, and assignment of respiratory phase.

figure 2: figure showing overview of heirarchical drift diffusion modelling and key parameter effects.

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Reposted by Artin Arshamian

Asifa Majid @asifamajid.bsky.social · Mar 27

One thing that's so fun about working on olfaction is the interdisciplinarity. An article in the Royal Society of Chemistry featuring our work on the cross-cultural perception of odor pleasantness. edu.rsc.org/feature/the-...

The science behind the smell

What makes a bad smell smell bad? Sniff out the chemical culprits behind obnoxious odours

edu.rsc.org

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Artin Arshamian @artinarshamian.bsky.social · Mar 25

How cool is this!? Interoception "in the" olfactory bulb via heartbeats. Let's test this in humans ASAP.

www.science.org/doi/10.1126/...

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Artin Arshamian @artinarshamian.bsky.social · Mar 14

Here we show that the human olfactory bulb can detect metabolic state, as evidenced by its response to fasting. This method enables the use of odors to study metabolic changes in health and disease (e.g., in eating disorders). Use it! #neuroskyence

www.sciencedirect.com/science/arti...

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Artin Arshamian @artinarshamian.bsky.social · Feb 14

Me: Draw a brain with the olfactory bulb and piriform cortex marked.

ChatGpt: The illustration of the human brain with the olfactory bulb and piriform cortex marked is now available.

Me: Yeah, it seems pretty reasonable. Thanks!

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Artin Arshamian @artinarshamian.bsky.social · Jan 31

This looks great! Cool study; I think I will suggest my (i.e., force) students to read it before they do their judgments of learning tasks for their exams!

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Artin Arshamian @artinarshamian.bsky.social · Dec 8

We show that while performance is not affected it does influence response bias and modulate brain activity during encoding. If you're fascinated by breathing and brain science, check out our open paper.

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