Elisabeth Parés Pujolràs

Delighted to share this paper, now published in @arvoinfo.bsky.social. With @spk3lly.bsky.social‬ and Anna Geuzebroek we explored differences in visual cortical responses for pattern pulses and pattern reversals. Here's the link:
jov.arvojournals.org/article.aspx...

1/3 Check out our new commentary bsky.app/profile/imag....

Neurally-informed modelling unravels a single evidence accumulation process for choices and subsequent confidence reports Subjective confidence in perceptual choices depends on computations occurring prior to and after choice commitment. However, the nature of these computations remains unclear. Current models disagree o...

Our newest preprint is out (doi.org/10.1101/2025.06.05.658071), with @lucvermeylen.bsky.social,Dasha Monakhovych, Cameron McCabe, Sarah-Louise Mannion, @kobedesender.bsky.social, @redmondoconnell.bsky.social, comparing post-decision confidence models against behaviour and neural decision signals...

We believe our results hint at a flexible neural architecture that can adapt to different decision contexts, and highlight how the CPP may play a key intermediary role in adaptive evidence accumulation. Stay tuned for upcoming related work, and thanks for reading!

The way that the CPP behaves in this task seems very different from its well-established characteristics in static contexts with continuous evidence (e.g. classic random dot motion tasks), where it reflects the absolute cumulative sum of evidence.

Further, we found that the centroparietal positivity (CPP) tracks effective evidence (i.e. it reflects how much a DV changes following a token, rather than just stimulus information), but it does not keep a sustained representation of the DV.

Adaptive circuit dynamics across human cortex during evidence accumulation in changing environments - Nature Neuroscience Optimal decision making in a changing world requires non-linear evidence accumulation. Murphy et al. report signatures of this adaptive computation in recurrent dynamics of human parietal and motor co...

We found that motor beta lateralisation kept track of an evolving decision variable (DV) in a sustained manner over trial time, consistent with previous MEG work:
www.nature.com/articles/s41...

Because the normative solution to this task does not prescribe perfect accumulation, we could dissociate objective evidence presented on the screen from effective evidence (i.e. the belief updates that each token triggered), and map these quantities onto neural signals.

We used an expanded judgement task where participants watched a slow sequence of discrete tokens (400 ms per token, up to 10 tokens) which favoured one of two possible choices. The task was volatile, which means that the choice supported by the tokens may change within a trial.

Dissociable encoding of evolving beliefs and momentary belief updates in distinct neural decision signals - Nature Communications People are capable of making near-optimal decisions in volatile, changing environments. Here, the authors show how two neural decision signals encode distinct aspects of the belief updating process un...

Very happy to share this paper, now published in
@natcomms.nature.com! nature.com/articles/s41...
With @spk3lly.bsky.social and @neuromurphy.bsky.social, we investigated the neural computations that allow us to make near-optimal decisions in changing environments. Here's a short summary:

Disentangling sources of variability in decision-making - Nature Reviews Neuroscience Identifying the psychological and neurobiological processes underpinning intra-individual variations in choice behaviour presents a formidable challenge. In this Review, Duffy et al. discuss how algor...

In life, 3 things are certain: death, taxes, and decision-making variability🧠. Our review tinyurl.com/4dcwafc4 explores how computational models 💻 explain variability, their limits, and recent advances. A thread🧵👇

@redmondoconnell.bsky.social @neuromurphy.bsky.social Mark Bellgrove (not on Bluesky)

Individual variability of neural computations underlying flexible decisions - Nature Behavioural experiments to study decision-making in response to context-dependent accumulation of evidence provide testable models that are consistent with the heterogeneity in neural signatures among...

1/7 Our paper on individual variability in decision-making is finally out in @nature.com! Inspired by the classic work by Mante and Sussillo, we trained many rats to solve context-dependent decision-making, and we found that different brains use different neural mechanisms to solve the same task!

Excellent weekend read!