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Micha Heilbron
PhD-candidate , / . Computational cognitive neuroscience
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Matthias Fritsche 27. sij
Excited to share the last project of my PhD "A Bayesian and efficient observer model explains concurrent attractive and repulsive history biases in visual perception" with
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Micha Heilbron 24. sij
Odgovor korisniku/ci @micahgallen
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Micha Heilbron 23. sij
Odgovor korisniku/ci @CaAl @EJWagenmakers i 8 ostali
Als je in de UK ernstig ziek wordt tijdens je PhD wordt je beurs mooi stopgezet. Is het echt overdreven om dat barbaars te noemen? (Om over betaald zwangerschapsverlof etc nog maar te zwijgen...)
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Micha Heilbron 18. sij
Odgovor korisniku/ci @Kane_WMC_Lab @NatureComms i 3 ostali
There is behavioural evidence for an effect of pronounceable nonwords. We wanted to maximise our contrast so we compared frequent words with unpronounceable nonwords - confounding lexical and phonological info. in the process. Res. in fig 4 consistent w/ both interpretations
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
... why this is an important debate in its own right. It's just that there is still a yawning gap between the type of important, but subtle theoretical questions debated between modellers, and the type of questions we can currently (even begin to) tackle with neuroscience 😔
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
stories about functional asymmetries between cortical layers and the ability of fMRI to pick those up in a meaningful way. RE: interactivity, the interactive models I used for the simulations are not very stable, prone to hallucinations & runaway effects, so I can totally see...
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
... addressing the latency question. However, I don't see how it would get at the interactivity issue, because there is still no way to distinguish the content of the bottom-up and top-down signals. One way you might is using laminar fMRI, but that does require buying into....
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
the effect occurs at 150 ms or 1500 ms after onset. This is an important limitation because if it were the latter, calling the representational enhancement a *perceptual enhancement* might become problematic... Currently planning a follow up with MEG, which can help ...
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
...namely: can we find evidence for a neural feedback effect? As to the nature of this feedback, I'm afraid the data don't speak to this, as we can't distinguish between info being sent forward and information merely represented With the current data, we don't even know if....
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
Right - thanks for clarifying. I only have a passing familiarity with ART and didn't realise it was not 'interactive' There are clearly multiple debates going on (e.g. whether there is feedback at all, what is the source of the feedback, etc). We ask the most basic question...
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Micha Heilbron 17. sij
Odgovor korisniku/ci @Mike_Page @NatureComms i 3 ostali
Hi! Thanks for the interest — and for the interesting question. Not sure if I fully understood it though. Are you here contrasting interactive accounts with ART? If so, could you elaborate a bit more on this theoretical difference?
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Micha Heilbron 17. sij
Odgovor korisniku/ci @anilkseth
thanks Anil, means a lot :)
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Micha Heilbron 17. sij
Odgovor korisniku/ci @DrMattDavis @NatureComms i 4 ostali
... (although the paradigm was perhaps not perfectly set up to measure these in the first place). So there was a decoding effect without amplitude difference - making it neither a classic 'prediction error' or 'sharpening' effect I suppose
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Micha Heilbron 17. sij
Odgovor korisniku/ci @DrMattDavis @NatureComms i 4 ostali
Hi! Thank you. Yes, Blank & Davis '16 very relevant here. Can't believe we forgot to cite it!😬(It figured prominently in the grant application I wrote to start this PhD in the first place.) 1 thing to keep in mind re: the discrepancy is that we did not find univariate effects...
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Micha Heilbron 17. sij
Odgovor korisniku/ci @profgeraintrees
thank you :)
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Micha Heilbron 17. sij
Odgovor korisniku/ci @BouhaliFlorence
Thank you Florence :)
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Micha Heilbron 16. sij
Odgovor korisniku/ci @Gryphire
Thank you!
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Micha Heilbron 16. sij
Odgovor korisniku/ci @AlexChalard @NatureComms i 3 ostali
Hi! Thanks for the interest. I’ll get back to you via dm :)
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Micha Heilbron proslijedio/la je tweet
Jaan Aru 16. sij
Knowledge enhances perceptual processing. Here and show that word context boosts the representational fidelity of individual letters in early visual cortex & increases the coupling to the reading network. Great!
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Micha Heilbron 16. sij
Odgovor korisniku/ci @NatureComms @D__Richter i 2 ostali
Alright, that’s the gist! Do check out the paper if you’re interested, there are many more details and some 11 supplementary figures I omitted for now 🙃 Many thanks to my collaborators and especially to my supervisor, for his input and guidance during the project
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