Nursima Ünver

@nunvera.bsky.social

PhD Candidate, Max Planck - University of Toronto Centre for Neural Science and Technology

SUPER excited to share the first-ever preprint out of my PhD! AND it comes with a CAT story. I know there are quite some people here who love seeing cat pictures!! 🐈1/🧵

I'm happy to share that last week I had two papers published! 🎉 One is my first PhD paper, and the other comes from my time as a research assistant at Proaction Lab. If you're interested in how well we remember speed, or how object knowledge is organized in the brain, follow the thread 🧵

Excited to share my first #preprint with @matthiasnau.bsky.social on how gaze behavior shapes brain activity during eyes-closed rest and sleep! Gaze-dependent activity was widespread even during sleep, including in many visual cortices, and altered brain-wide functional connectivity! 🧵 1/8

Brain-wide gaze-dependent activity during eyes-closed rest and sleep

Gaze behavior and brain activity are tightly coupled during perception and mental imagery. Whether this coupling extends to eyes-closed states remains largely unknown, primarily because measuring eye ...

biorxiv.org

New paper! We compared EEG decoding for scenes that appeared abruptly versus scenes emerging gradually during continuous visual input. Takeaway: Presentation context matters when interpreting EEG decoding time courses. With @michaengesee.bsky.social and Daniel Kaiser. doi.org/10.1152/jn.0...

Abrupt scene onsets and gradually emerging scene information produce distinct EEG decoding dynamics | Journal of Neurophysiology | American Physiological Society

Multivariate analyses of magneto-/electroencephalography (M/EEG) data are typically performed on neural responses time-locked to discrete stimulus onsets. Such designs usually reveal high decoding performance during the initial transient response (0–500 ms), which subsequently drops to a lower, sustained level. Here, we examined time-resolved EEG decoding of natural scene processing when scenes gradually enter the visual field without a clear onset. We created video sequences in which one scene category (e.g., a beach) smoothly transitioned into another category (e.g., a forest) by blending two scenes into a single composite panorama and moving a square aperture across it. We compared EEG decoding for the first scenes within the transitions, which appeared with a sudden, artificial onset, to the second scenes, which emerged naturalistically as the videos progressed. For the first scenes, we observed robust category decoding from 60 ms after onset with a clear peak structure. For the second scene, category decoding was markedly weaker and showed no discernible peak structure. Realigning the appearance of category-diagnostic content for the second scene using deep neural networks did not enhance decoding or recover a peak structure. Furthermore, classifiers trained on the first scene generalized to the second, but with a broad, temporally diffuse pattern, instead of a diagonal pattern more consistent with a shared hierarchical processing timeline. Together, these findings demonstrate that time-resolved EEG decoding is sensitive to stimulus-presentation context. Accordingly, temporal decoding patterns obtained in conventional trial-based paradigms may not generalize unchanged to conditions involving gradual scene transitions and continuous visual input. NEW & NOTEWORTHY Using multivariate EEG decoding, we show that scene-category information follows different temporal profiles across two presentation regimes: abrupt scene appearance after a grayscale screen and gradual scene emergence during continuous visual input. Our findings demonstrate that time-resolved decoding is sensitive to stimulus-presentation context and should not be interpreted as an invariant signature of a fixed visual processing hierarchy.

doi.org

Preprint alert! 🚀 Spontaneous eye blinks are often treated as EEG artefacts. We show they can serve as temporal markers of internal attention, aligning with moments of attentional focusing in working memory. Check it out:

Spontaneous eye blinks as temporal markers of internal attention

Eye blinks are among the largest physiological artefacts in electroencephalography and are typically removed from the recordings. Yet their timing may carry information about cognition. Here, we asked...

biorxiv.org

How do we keep up with the pace of our surroundings? Previously, we’ve shown that working memory encoding speeds up when you expect limited encoding time. How does the brain accomplish this? In new work, we found that the brain uses an accelerated neural code⚡🧠: www.biorxiv.org/content/10.6... (1/6)

Neural acceleration drives adaptations in working memory encoding speed

Humans and non-human animals adaptively boost their encoding speed when they expect limited sensory exposure time, so that they can capture essential information before it is gone. However, it is uncl...

biorxiv.org

I am looking for a postdoctoral researcher to join my lab at Sabancı University in Istanbul for a 2-year TÜBİTAK-funded position, with possible extension. Interested candidates can email me with a CV and a brief note about their research interests. More details on gunselilab.com soon.

Memory, Attention, & Cognitive Control Lab | Istanbul | Sabanci Uni.

Memory, Attention, & Cognitive Control Lab at Sabancı University - Eren Günseli. We study how memory and attention interact, how humans control what to remember, what to forget, what to attend to, and...

gunselilab.com

Focus. Relax. Focus again. Turns out people would rather not do that! With my amazing mentors Wouter Kool and Julie Bugg, we show that people actively avoid switching between control states even in a single task, and trade off this demand against conflict. More in Wouter's thread and paper below!

APA PsycNet

psycnet.apa.org

Wouter Kool@wouterkool.bsky.social · 2mo ago

🚨Paper alert!🚨 Across 5 expts, @mileritayar.bsky.social's new JEPG paper shows that people explicitly avoid switching between attention control states. Using demand selection tasks, we find that people don't just avoid cognitive conflict, but also switching between congruent and incongruent trials.

Happy to share that I will give a colloquium talk at the Heymans Institute for Psychological Research, University of Groningen, on June 2 I will present my work on how experiences are segmented into meaningful events, and how contextual stability and working memory contribute to this process ✨