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Şahcan Özdemir

@sahcan

sahcanozdemir.github.io | PhD candidate @IfADo| cognitive neuroscience | working memory | attention| action

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02.10.2023
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Latest posts by Şahcan Özdemir @sahcan

I’m excited to share the preprint of my first paper! Finding neural correlates of SoA is hard, but I’m thrilled to share first insights of my research: in line with bayesian approaches to agency, we argue that feedback-induced states of perceived agency alter task preparation and outcome monitoring

10.03.2026 04:22 👍 8 🔁 2 💬 0 📌 0
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a little girl is making a funny face while wearing a blue shirt with a leopard print . ALT: a little girl is making a funny face while wearing a blue shirt with a leopard print .

We are excited to announce that we will host WMS2026!
The tentative dates are July 14th-17th, and we are currently looking for a postdoc to join the WMS2026 organizer team.
If you are interested, please submit your application using the link below (Deadline: March 29th)

forms.gle/noqsuEja2tB8...

24.02.2026 12:18 👍 17 🔁 13 💬 0 📌 2

I am glad to attend #CNS2026 in beautiful Vancouver🇨🇦! I will present my work on action planning in visual working memory. In this project, we focus on the factors leading motor planning such as selective attention, affordances and task requirements. Meet me at the Poster Session B (B38)!

05.03.2026 15:33 👍 16 🔁 6 💬 0 📌 0

Must-see at CNS 2026:
Poster

Sunday pm C36
Priority-Driven Transformation of Visual Working Memory Content, Jung Woo Hur & me
Tuesday am

Tuesday am F45
Beta oscillatory—not burst—dynamics support priority coding in working memory

Jacqueline M. Fulvio & me

06.03.2026 16:57 👍 12 🔁 7 💬 0 📌 0

I am happy to be attending #CNS2026 with the Yale Wu Tsai Institute travel award to present this paper👇🏻 as a poster - it’ll be on Monday from 2:30-4:30pm (session E), come check it out!

05.03.2026 15:00 👍 19 🔁 8 💬 0 📌 0

I am glad to attend #CNS2026 in beautiful Vancouver🇨🇦! I will present my work on action planning in visual working memory. In this project, we focus on the factors leading motor planning such as selective attention, affordances and task requirements. Meet me at the Poster Session B (B38)!

05.03.2026 15:33 👍 16 🔁 6 💬 0 📌 0

Join our lab in Geneva, as a postdoc working on #workingmemory, with both Jarrod Lewis-Peacock and myself !

02.03.2026 11:40 👍 23 🔁 19 💬 0 📌 1
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New paper in Imaging Neuroscience by Leon von Haugwitz, Edmund Wascher, and Mauro F. Larra:

Cardiac phase modulates behavior and response related lateralization in visual spatial conflicts during change detection

doi.org/10.1162/IMAG...

28.02.2026 03:38 👍 7 🔁 5 💬 0 📌 0
OSF

📍2003 marked the year in which the retro-cue paradigm was born. Fast forward, 23 years later, we adapt this logic to long-term memory and ask how does attention shape retrieval from long-term memory? 🤔

w/ @william-nm.bsky.social Kia Nobre, Nahid Zokaei and Nora Roüast
osf.io/preprints/ps... 1/n

26.02.2026 16:46 👍 19 🔁 7 💬 1 📌 1
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10 PhD positions at JLU Giessen in the new Research Training Group "PIMON"! We will explore how humans perceive and interact with materials and objects in natural environments.
More information on the project, the PIs, and how to apply here:
www.uni-giessen.de/de/ueber-uns...
Please share!

26.02.2026 09:29 👍 32 🔁 19 💬 1 📌 1

New preprint! We mapped out how ‘diffuse’ predictions affect neural representations. We show predictions reshape the geometric layout of the neural representations by compressing the representational spread and stabilize the neural code by reducing the neural variance during memory encoding.

24.02.2026 08:42 👍 19 🔁 9 💬 1 📌 2
Professorship for Cognitive Psychology | Department of Psychology | UZH

Postdoctoral researcher (80%) in Cognitive Psychology, University of Zurich, Zurich, Switzerland

The successful applicant will work with the head of the Cognitive Psychology Unit, Klaus Oberauer, and the Cognitive Psychology team.
Application deadline: 20 March 2026

19.02.2026 14:14 👍 13 🔁 12 💬 0 📌 1
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A confound-free method to manipulate pupil size in psychological experiments - Psychonomic Bulletin & Review Researchers are increasingly showing interest in the ways in which various cognitive processes are influenced by the size of the pupil. However, this realm of research is complicated by the pupil’s no...

🚨Pupillometrists!

Reviewer2: “But what if changing pupil size unintentionally affected arousal?” 👁️

Now we give you the answer! In collaboration with Snell lab www.snelllab.eu, we show that you can safely manipulate pupil size, via ipRGC activation, without unintentionally altering arousal!

19.02.2026 09:34 👍 27 🔁 7 💬 1 📌 1

So proud that @scannedfruits.bsky.social submitted the third (and final!) paper of her #PhD thesis this week 🎉What a milestone!

Check out the preprint & stay tuned for a summary thread 👀🧵

15.02.2026 21:11 👍 9 🔁 1 💬 0 📌 1

Check out our new preprint, which presents object-based retrieval processes in multisensory working memory. Here we show that unimodal feature probes incidentally reactivate untested tones and orientations of audiovisual objects. +

17.02.2026 14:33 👍 10 🔁 4 💬 1 📌 0
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Contents of visual predictions oscillate at alpha frequencies Predictions of future events have a major impact on how we process sensory signals. However, it remains unclear how the brain keeps predictions online in anticipation of future inputs. Here, we combin...

@dotproduct.bsky.social's first first author paper is finally out in @sfnjournals.bsky.social! Her findings show that content-specific predictions fluctuate with alpha frequencies, suggesting a more specific role for alpha oscillations than we may have thought. With @jhaarsma.bsky.social. 🧠🟦 🧠🤖

21.10.2025 11:05 👍 113 🔁 44 💬 7 📌 3

🚨 Job alert🚨 My former lab in Germany led by Daniel Schneider is recruiting a postdoc. Daniel’s research sits at the intersection of memory and attention, and the ideal candidate will have expertise in EEG and/or fMRI.
👉Job ad in English: www.dropbox.com/scl/fi/br2vg... 1/n

29.01.2026 21:48 👍 11 🔁 12 💬 1 📌 0
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What is the brain for? Active inference is widely discussed as a unifying framework for understanding brain function, yet its empirical status remains debated. Our review identifies core predictions across the action-perception cycle and evaluates their empirical support: osf.io/preprints/ps...

29.01.2026 08:28 👍 98 🔁 39 💬 2 📌 1
Feature and space-based interference with functionally active and passive items in working memory Functionally active and passive states in working memory have been related to different neural mechanisms. Memoranda in active states might be maintained by persistent neural firing, whereas memoranda in passive states might be maintained through short-term synaptic plasticity. We reasoned that this might make these items differentially susceptible to interference during maintenance, in particular that passively maintained items might be more robust. To test this hypothesis, we gave our participants a working memory task in which one item was prioritised (active) by always probing it first, while the other item was deprioritised (passive) by always probing it second. In two experiments, on half the trials, we presented an interfering task during memory maintenance, in which the stimuli matched either the feature dimension of the memory items (colour or orientation), or their spatial location. Whether the interfering task appeared on a given trial was unpredictable. In a third experiment where participants were given prior knowledge of the interference condition, and finally in a fourth experiment we used a reward-based prioritisation cue. Across experiments, we found that both active and passive memory items were affected by interference to a similar extent, with overall performance being closely matched in all experiments. We further investigated precision and probability of target response parameters from the standard mixture model, which also showed no differences between states. We conclude that active and passive items, although potentially stored in different neuronal states, do not show differential susceptibility to interference. ### Competing Interest Statement The authors have declared no competing interest.

🎉 My first first-author paper was just accepted in JEP:HPP! We asked what “active” vs “passive” WM states do - do they protect against interference? Across 4 behavioural experiments we find no reliable protection. Updated preprint here: doi.org/10.1101/2024.02.05.578913 @elkanakyurek.bsky.social

27.01.2026 16:23 👍 17 🔁 5 💬 0 📌 0
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Ignorance is bliss: Exploring the dual role of knowledge in event segmentation - Psychonomic Bulletin & Review Episodic memories are segmented. This study explores the dual role of prior knowledge in event segmentation, hypothesizing that knowledge leads to coarser segmentation when experiences align with it, ...

How does prior knowledge affect the way we experience the world?

In our new paper, we show that prior knowledge can both increase and decrease how often experience is segmented into events.

link.springer.com/article/10.3...

21.01.2026 11:02 👍 13 🔁 7 💬 1 📌 0
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a husky puppy is laying on the floor with its tongue out and wearing a blue collar . ALT: a husky puppy is laying on the floor with its tongue out and wearing a blue collar .

Here’s a thought that might make you tilt your head in curiosity: With every movement of your eyes, head, or body, the visual input to your eyes shifts! Nevertheless, it doesn't feel like the world does suddenly tilts sideways whenever you tilt your head. How can this be? TWEEPRINT ALERT! 🚨🧵 1/n

21.01.2026 12:28 👍 50 🔁 19 💬 1 📌 3

Just tell me a thriller that exceeds ‘two scientists travelling to the Austrian Alps to meet a cow who uses a stick to scratch her back'!

20.01.2026 13:39 👍 0 🔁 0 💬 0 📌 0
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It won't actually exist for another month or so, but because it now 'exists' on amazon, I'll humbly observe that, after working through this book, your student/trainee would be able to read and understand all but two or three papers in this week's J. Neurosci. Check it out:

16.01.2026 22:38 👍 133 🔁 38 💬 5 📌 0
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Pupil size reflects moment-to-moment fluctuations in mental imagery, but not (or hardly) individual differences in imagery Previous research has shown that the eyes' pupils are larger when imaging dark as compared to bright objects or scenes. Based on this, it has been claimed that pupil size is a sensitive marker of ment...

🚨 #Preprint alert 🚨 A multilab study led by Claire Vanbuckave investigated whether the strength of pupil responses to imagined brightness/ darkness reflect differences in vividness of mental imagery. We found … 👇 1/3 🧵 #psychology #aphantasia #pupillometry #mentalimagery
doi.org/10.64898/202...

15.01.2026 09:52 👍 25 🔁 10 💬 2 📌 3

With some trepidation, I'm putting this out into the world:
gershmanlab.com/textbook.html
It's a textbook called Computational Foundations of Cognitive Neuroscience, which I wrote for my class.

My hope is that this will be a living document, continuously improved as I get feedback.

09.01.2026 01:27 👍 586 🔁 237 💬 16 📌 10

I think this is a key point for our field to reckon with – that the underlying cognitive representation can vary across the many tasks and conditions that we use to probe working memory. I think that doesn't mean we give up our search – we do have to rethink the questions we are asking though!

06.01.2026 22:05 👍 9 🔁 1 💬 1 📌 0
Illustration of the hypothesized flows of information between perception, memory and cognitive control in a conceptual model of working memory. Stimuli attributes are processed to varying degrees of abstraction and parts of these representations can be loaded into working memory under the guidance of cognitive control. Familiar stimuli such as the letter B activate visually abstract representations while less familiar stimuli are limited to sensory representations. Information can be shifted both up and down levels of the perceptual hierarchy to build either more or less abstract representations of either perceived or imagined stimuli. Working memories can be shifted into or out of the hierarchy as needed.

Illustration of the hypothesized flows of information between perception, memory and cognitive control in a conceptual model of working memory. Stimuli attributes are processed to varying degrees of abstraction and parts of these representations can be loaded into working memory under the guidance of cognitive control. Familiar stimuli such as the letter B activate visually abstract representations while less familiar stimuli are limited to sensory representations. Information can be shifted both up and down levels of the perceptual hierarchy to build either more or less abstract representations of either perceived or imagined stimuli. Working memories can be shifted into or out of the hierarchy as needed.

We recently published a theoretical review about how compositional and generative mechanisms in working memory provide a flexible engine for creative perception and imagery.

Pre-print:
osf.io/preprints/ps...

Paper: www.sciencedirect.com/science/arti...

06.01.2026 19:04 👍 86 🔁 34 💬 3 📌 1

Talking today about whether attention can modulate retinal activity, come join! 👁️ #nvp25

18.12.2025 09:14 👍 6 🔁 6 💬 0 📌 0
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Our new preprint is out!

Using a continuous-report paradigm, we show that divided attention reliably disrupts long-term memory retrieval by reducing accessibility—not precision.

Two experiments + mixture modeling + TCC.

Link: osf.io/preprints/ps...

09.12.2025 15:56 👍 21 🔁 7 💬 1 📌 1
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OpenWMData A collection of publicly available working memory datasets

Do you have an open working memory dataset and want it to be findable and reused? You can now add it to the Open WM Data Hub: williamngiam.github.io/OpenWMData! The collection of datasets tagged with useful metadata is steadily growing thanks to a small team of volunteers!

01.12.2025 23:28 👍 65 🔁 41 💬 3 📌 1