Heida Maria Sigurdardottir

@heidasigurdar.bsky.social

Cognitive (Neuro)scientist. Professor and Head of Dept. of Psych. Uni. of Iceland. PI of the Icelandic Vision Lab (visionlab.is). I like brains and lipstick. Weird is good. Alt account: @icevislab.bsky.social

If LLMs are increasingly used for data analysis, should we worry that they might encourage p-hacking? A recent preprint suggests that the answer may be yes, at least in relatively complex analytical pipelines. I share some personal experience here 👇 www.linkedin.com/posts/stefan...

LLM p-hacking | Stefano Palminteri

If LLMs are increasingly used for data analysis, should we worry that they might encourage p-hacking? A recent preprint, also featured in Science Magazine, suggests that the answer may be yes, at lea...

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Folda Guðlaugsdóttir:Ég valdi sálfræði af því að mig langaði að skilja betur hegðun og hugsun fólks og byggja það á vísindalegum grunni. Mér finnst sérstaklega áhugavert hvernig hægt er að nota sálfræðilega þekkingu í raunverulegum aðstæðum, til dæmis til þess að styðja við fólk og bæta líðan þess.

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My daughter just told me that she and her friends are going out to do ding dong dash -- are you supposed to tell your parents that? 😆 And then some dude chased them and now she is going to attempt to bribe him?! This is not how I remember things being done 🤣🤣🤣🤣

Though not without their flaws, Universities they have *already* done more to drive economic development and innovation than pretty much any other human institution, and that's in addition to creating informed citizens and otherwise enriching the human experience. The evidence for this is...

I am so happy to have been a part of this + @antonlukashevich.bsky.social The study is actually immensely important IMO. So many studies have been designed under the assumption that the link between CDA and individual differences in memory is large and robust. We find that this is not the case. 1/N

William Ngiam | 严祥全@williamngiam.github.io · 3mo ago

A multi-lab replication effort (@eegmanylabs.bsky.social) of the contralateral delay activity (CDA) has just been published online! In brief, the set-size effect appears to be robustly observed, but CDA correlation with VWM capacity is not reliably strong. doi.org/10.1016/j.co...

"Once the diverse abundance of [Arousal⁺ & Arousal⁻] populations across brain regions is considered, neurovascular coupling becomes consistent across the brain: it is described by a single model with two HRFs that are similar across regions" Super interesting work by @agnesland.bsky.social et al! 👇

Agnès Landemard@agnesland.bsky.social · 4mo ago

How does blood flow relate to brain activity? We discovered that it reflects two neural populations affected oppositely by arousal. Together, they explain neurovascular coupling in all brain regions and brain states! Out today in Nature: rdcu.be/fdC2A @uclbrainscience.bsky.social

The supply of blood to brain tissue is thought to depend on the overall neural activity in that tissue, and this dependence is thought to differ across brain regions and across brain states. However, studies supporting these views have measured neural activity as a bulk quantity and related it to blood supply following disparate events in different regions. Here we measure fluctuations in neuronal activity and blood volume across the mouse brain, and find that their relationship is consistent across brain states and brain regions but differs in two opposing brainwide neural populations. Functional ultrasound imaging (fUSI) revealed that whisking, a marker of arousal, is associated with brainwide fluctuations in blood volume. Simultaneous fUSI and Neuropixels recordings showed that neurons that increase activity with whisking have distinct haemodynamic response functions compared with those that decrease activity. Their summed contributions predicted blood volume across states.Brainwide Neuropixels recordings revealed that these opposing populations coexist in the entire brain. Their differing contributions to blood volume largely explain the apparent differences in blood volume fluctuations across regions. The mouse brain thus contains two neural populations with opposite relations to brain state and distinct relationships to blood supply, which together account for brainwide fluctuations in blood volume.

🎯 ECVP Symposia Spotlight Featuring: • What vision scientists can learn from continuous movement tracking during decision making — Elahe’ Yargholi • Vision on the Move: From Eye Movements to Visual Encoding (and back) — Antonella Pomè & Alessandro Benedetto #ECVP2026 #VisionScience

🌀ECVP Symposia Spotlight Featuring: • Probing the Visual System: Illusions as Windows into Typical and Atypical Cognition — Erez Freud & Elisabeth Hein • Visuomotor transforms in prostheses, virtual reality, and teleoperation — Emily Crowe #ECVP2026 #VisionScience

🙂 ECVP Symposia Spotlight# Featuring: • Recent Advances in Face Perception and Identification — Alejandro J. Estudillo & Christel Devue • Artificial Intelligence as a Window into Material Perception — Masataka Sawayama & Filipp Schmidt #ECVP2026 #VisionScience

🧠 ECVP symposia Spotlight Featuring: • Beyond local features: Spatiotemporal structure in perception and neural processing — David Pascucci & Michael H. Herzog • The rhythmic nature of perception and attention: Evidence, challenges, and open questions — Maëlan Q. Menétrey #ECVP2026 #VisionScience

Don't work in this area and can't vet claims about the study, so am curious what others think. Generally, the core argument Chris appears to make—breaking the blind is a fatal flaw for any RCT—appears similar to the argument we've made about using psychedelics for treating mental health problems.

Chris Ferguson@cjferguson1111.bsky.social · 4mo ago

The UK’s proposed study of social media reduction in kids doubles down on a failed experimental protocol & is likely to produce misleading results. It’s easy to tear apart a study post-hoc so I’m putting my marker down before the study begins: This is a bad study. open.substack.com/pub/grimoire...