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Jarrod Dowdall
@jarroddowdall.bsky.social
Systems Neuroscience - 🐒 - electrophysiology - methods - 🇨🇦- Amateur Astronomy 🪐
103 followers134 following21 posts
JDjarroddowdall.bsky.social

Well it is a cute idea to suggest that we are as unconfident about spikes as we are the LFP. But I would like to hear your mechanistic explanation for LFP entrainment. Keep in mind the LFP is roughly +/- 2mV in amplitude (broadband amplitude), and the resting state of the neuron is around -70 mV.

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JDjarroddowdall.bsky.social

Sure, it might be easier to imagine how the brain orchestrates neural activity by casting into a low-dimensional space, such as the LFP, but that doesn’t prove the LFP isn’t the end of a casual chain.

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JDjarroddowdall.bsky.social

Well at its lowest level wouldn’t you say neurons communicate by changing each others conductance? To me at least, resonance isn’t so much about communication as it is signal amplification, which is then signal transmission but not necessarily signal processing (communication = encoding & decoding)

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JDjarroddowdall.bsky.social

True, but still not bilaterally symmetric.

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JDjarroddowdall.bsky.social

That makes sense. I think most people would jump to cite Phineas Gage as an example of severe deficits from a unilateral frontal lesion. But I have recently learned that it is likely much of what we have been taught about his behavioral changes maybe more lore than unequivocal fact.

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JDjarroddowdall.bsky.social

I guess what he means is that they are picking up spikes (action potentials) and not just LFP (field potentials), but the way he says it is not typical. You should be able to tell immediately if you have spikes or not just by looking and listening to your recording.

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JDjarroddowdall.bsky.social

Their bluesky account might be gone, but the Sworn Enemies list lives on… www.theseedsofscience.org/sworn-enemies I am curious if any of the 307 “Gardeners” listed on their website know what they signed up for.

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JDjarroddowdall.bsky.social

For podcasts I can recommend You Are Not So Smart and Revisionist History.

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JDjarroddowdall.bsky.social

Including neurons from the Electric Fish and the Bearded Dragon!

Figure 5 from the pre-print showing neuronal waveforms recorded in 4 species, the mouse, pig-tailed macaque, electric fish, and bearded dragon. The bottom panel shows the footprint (spread) across the probe of the neurons recorded in all 4 species, and indicates roughly 10-12% of neurons had a spread less than 20 microns in the macaque, mouse and bearded dragon. Whereas 48.7% of the recorded units in the electric fish had a spread less than 20 microns. This figure demonstrates that the high-density NP Ultra is able to record units that previous Neuropixels probes are not.
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JD
Jarrod Dowdall
@jarroddowdall.bsky.social
Systems Neuroscience - 🐒 - electrophysiology - methods - 🇨🇦- Amateur Astronomy 🪐
103 followers134 following21 posts