Jayson Jeganathan
@jaysonjeg
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Neuroscientist and doctor in psychiatry, working on fMRI, complex systems, and brain function
Newcastle, Australia
Joined June 2019
Do you work on surface MRI such as HCP data? Our paper is finally out in Imaging Neuroscience, showing biases in surface fMRI. The revised ms has many new insights!.TLDR: Vertices are much closer to each other in sulci, resulting in (fake) high spatial autocorrelation. (1/5).
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RT @ImagingNeurosci: New paper in Imaging Neuroscience by Jayson Jeganathan, Michael Breakspear, et al:. Spurious correlations in surface-bβ¦.
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This was a team effort! @KoussisNikitas @tremodian @Sina_Mansour_L @AndrewZalesky @DrBreaky @phogat_richa @jchrispang.
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I'm proud of this work, and I hope this paper helps you to avoid spurious conclusions in your work. Check out the full paper ( for a detailed breakdown and for other downstream analyses that can be impacted (FC fingerprinting, hyperalignment, etc). (5/5).
direct.mit.edu
Abstract. The study of functional MRI (fMRI) data is increasingly performed after mapping from volumetric voxels to surface vertices. Processing pipelines commonly used to achieve this mapping...
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The new Onavg template promises to even out variability in inter-vertex spacing across the cortex. We tested this. This template reduces variability by 90% in the common surface space, but only by about 20% in subject-specific surfaces :( (4/5).
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We then explored the consequences. Adjacent sulcal vertices have highly correlated fMRI time series just because they're closer. This can trick functional parcellations into putting parcel boundaries on gyri instead. (3/5)
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This new visual by @phogat_richa shows it all. In this single-subject flattened cortex, we see mesh vertices and triangles with gyri (red) and sulci (blue). The triangles are clearly smaller in sulci (blue). All fsaverage and fsLR surfaces look like this. (2/5)
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Amazing paper !.
1/12 How do animals build an internal map of the world? In our new paper, we tracked thousands of neurons in mouse CA1 over days/weeks as they learned a VR navigation task. @nspruston @HHMIJanelia, w/ co-1st author @JohanWinn.Video summary: Paper:.
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RT @sslevine: In markets, there are price bubbles. In science, are there popularity bubbles? When promising research gets hyped up, it canβ¦.
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Wow. Most recent openAI model o3 smashes the prev leaderboard for ARC-AGI reasoning challenge. It is also now the 175th best coder in the world (CodeForces challenge), and can solve 25% of hard-for-humans FrontierMath Qs (up from 2%). What does this all mean?.
ARC-AGI scores for past five years of OpenAI models (updated w/ release dates)
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RT @quorumetrix: I've combined some of these together into a new #neuro #visualization "In the eye of a fly": .Using the @FlyWireNews visuaβ¦.
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Wow.
ππΌπ ππ΅πΌππΉπ± πΌπ»π² π±πΌ πππππ²πΊπ π»π²ππΏπΌππ°πΆπ²π»π°π²?? .This way! Every neuro program should just make this required reading and teach students how to do outstanding science like this.
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Awesome new work by @DrPhilipMosley ! Combining facial video analysis and fMRI analysis with hidden Markov models to understand the unique features of melancholic depression.
Our paper is out in @molpsychiatry with a cast of superstars! #OpenAccess . Including @jnvandermeer @jaysonjeg @DrBreaky @Britt_Mitchell1 @LucaCocchi78 and many significant others @QIMRB_Institute:. Twitter thread incoming!.
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RT @jeffclune: Can AI agents design better AI agents?. We describe a newly forming research area "Automated Design of Agentic Systems" (ADAβ¦.
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RT @felicitysimps0n: Thinking of coming to Newy for ACNS 2024?.Submission deadline has been extended to midnight 30 August AEST. https://t.β¦.
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RT @ImagingNeurosci: New paper in Imaging Neuroscience by Jayson Jeganathan, Michael Breakspear, et al:. Integrating anatomical and functioβ¦.
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Even in MEG and EEG, anatomical info can leak into functional data, yielding spuriously perfect fingerprinting.
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Could be of interest to folk working on hyperalignment / functional alignment - @mafeilong @BertrandThirion @fMRIstats @haxbylab.
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