[HN Gopher] A new doorway to the brain ___________________________________________________________________ A new doorway to the brain Author : Brajeshwar Score : 95 points Date : 2022-10-12 14:40 UTC (8 hours ago) (HTM) web link (nautil.us) (TXT) w3m dump (nautil.us) | anthk wrote: | Rhythms of the Brain - Gyorgy Buzsaki | | https://neurophysics.ucsd.edu/courses/physics_171/Buzsaki%20... | | Enjoy. | lawrenceyan wrote: | Wow, I'm surprised this was published in 2006. | spacecity1971 wrote: | As a dental professional working with oral/maxillofacial surgery | teams, I can't wait for fMRI quality imaging in a portable | affordable device. First to market with such systems will make a | fortune. | abrichr wrote: | Does https://hyperfine.io/ fit the bill? | spacecity1971 wrote: | No, but it's a step closer. CBCT is the standard right now, | but it has limitations like poor bone density measurement and | no dynamic imaging. | petercooper wrote: | Just because I'm curious, what benefits would fMRI provide to | oral surgery? | spacecity1971 wrote: | An fMRI quality imaging system would allow dynamic planning | for a full arch implant retained prosthesis, for example. | phren0logy wrote: | But wouldn't a standard structural/anatomical MRI work | better than fMRI for that purpose? | spacecity1971 wrote: | I guess fMRI isn't really a good analog. What is needed | is an MRI quality video sequence showing movement. | Dynamic planning would allow occlusal schemes to be | designed more accurately, therefore avoiding many common | issues with full arch rehab, for example. | alvarezbjm-hn wrote: | None. You can't have any metal beside the MRI scanner, the | strong magnetic field turns it into projectiles. | jcims wrote: | Having just had a wisdom tooth extracted, something that can | help them locate nerves for targeted local anesthesia would be | nice. In both this and a crown procedure I had done ten years | ago the needle hit a nerve bundle and it felt like my face was | getting tazed lol. | sfink wrote: | I appreciate that the article is written to be readable to a wide | audience. But: | | > But ultrafast ultrasound is exponentially faster, more | powerful, and more spatially sensitive than standard ultrasound: | It can produce many thousands of detailed high-resolution images | per second. | | is there any way to stop this weird mutation of the meaning of | the word "exponentially"? Probably not, I guess. I trip over it | when reading: "Hmm... so it's exponential in... oh, dammit, they | just mean 'way faster'." | jcuenod wrote: | I find the same thing with "its an order of magnitude xxx-er" | Turing_Machine wrote: | I think you're fighting a losing battle here, sorry to say. | This sort of thing has been going on for a while. | | "Terrific" hasn't meant "inspiring terror" for a very long | time. | pessimizer wrote: | We're still going to need a word for "exponentially" though, | and it would help if that word contained "exponent." | "Terrific" is an unnecessary word in English, just because we | have a ton of words for things that inspire fear. | | "Exponentially" being used to mean "a lot" is bad not because | it's a new usage, but because "exponentially" is being | demoted to a word that has a bunch (a shitload, a fuckton, | lots, plenty, too many) synonyms when in its accurate usage | it's a word with few or none. You're losing meaning when you | make a thing more complicated to say. | | Of course, this sort of usage happens a lot, too, but it's | always because some people are using a technical-sounding | word to substitute for a common word in order to give the | impression of expertise.* | | ----- | | * as opposed to when technicians steal a common word and make | it a very specific technical term, which also happens all the | time. | ggm wrote: | Decimate this comment thread! | kogus wrote: | I mean, exponents can be fractions. Maybe it's x^1.2 faster? I | think it is funny when advertisements claim that something is | "a fraction of the price". You could literally raise prices and | run such an ad, and be technically correct. 3/2 is a fraction, | after all. | yarg wrote: | x^1.2 is a polynomial (1.2^x is exponential). | ktpsns wrote: | This e^n times! If there is no _n_ , there is no exp! | nh23423fefe wrote: | meh, literally. exponentially is just an intensifier applied to | a comparative. | | its never really unclear which is which. two objects is | comparison, one object is process, as in, lily pads filled the | pond exponentially. Which modifies filled not a comparative. | sfink wrote: | See, I guess I'm just on the opposite end of the pedantry | scale from you, because I'm now sitting here trying to | imagine what a literal meh would look like or taste like. | | > exponentially is just an intensifier applied to a | comparative. | | That is how it is misused, yes. Used correctly, it refers to | a class of functions that take a varying quantity as input. | cf linearly, quadratically. | | > ...lily pads filled the pond exponentially. Which modifies | filled not a comparative. | | I don't have a problem with that example. Well, I would | prefer it to be "lily pads multiplied exponentially to fill | the pond", but that's not much of a jump. | | The verb "filled" suggests the input: time. "ultrafast | ultrasound is exponentially faster [than traditional | ultrasound]" does not. Is it exponential in the amount of | power you apply? The duration of a reading? The number of | goats you sacrifice? | jacobsimon wrote: | Love the progress in brain imaging. Similar to fMRI, this seems | to be focused on identifying blood flow to different areas which | seems useful for a lot of diagnostic/medical purposes. I'm | personally doubtful that the use cases at the end of the article | like brain-computer interfaces are well-suited to the technology | though, since it can't measure neural activity as directly as | electrodes. | | One thing it doesn't discuss is the latency of the observed | signals relative to brain activity -- in MRI there is a 5-6 | second delay due to the time it takes for brain activity to | translate into blood flow and oxygen signals, whereas electrical | activity is in real time. | [deleted] | tricky wrote: | My favorite somewhat related research is using focused high | energy ultrasound with microbubbles to open the blood-brain | barrier enough to allow therapeutics to pass through. Ultrasound | is an old technique that sort of went out of style but it truly | is lot of fun. | zygy wrote: | Any good publications to learn about this? ___________________________________________________________________ (page generated 2022-10-12 23:00 UTC)