[HN Gopher] A new doorway to the brain
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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?
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