Scientists Are Researching a Device That Can Induce Lucid Dreams On Demand (vice.com) 98
An anonymous reader quotes a report from Motherboard: [A] new tech startup, Prophetic, aims to bring lucid dreams to a much wider audience by developing a wearable device designed to spark the experience when desired. Prophetic is the brainchild of Eric Wollberg, its chief executive officer, and Wesley Louis Berry III, its chief technology officer. The pair co-founded the company earlier this year with the goal of combining technologies, such as ultrasound and machine learning models, "to detect when dreamers are in REM to induce and stabilize lucid dreams" with a device called the Halo according to the company's website. [...]
Prophetic does not make any medical claims about its forthcoming products -- Halo is tentatively slated for a 2025 release -- though Wollberg and Berry both expressed optimism about broader scientific research that suggests lucid dreams can reduce PTSD-related nightmares, promote mindfulness, and open new windows into the mysterious nature of consciousness. To explore those links further, Prophetic has partnered with the Donders Institute, a research center at Radboud University in the Netherlands that is focused on neuroscience and cognition, to generate the largest dataset of electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) observations of lucid dreamers, according to the company. The collaboration will also explore one of central technologies behind Prophetic's vision, known as transcranial focused ultrasound (TUS). This non-invasive technique uses low-intensity ultrasound pulses to probe the brain, and interact with neural activity, with a depth and precision that cannot be achieved with previous methods, such as transcranial electrical stimulation or transcranial magnetic stimulation.
At this point, both the possibilities and limits of Prophetic's concept remain unclear. While ultrasound devices have been widely used in medicine for decades, the process of stimulating parts of the brain with TUS is a relatively new development. Within the past few years, scientists have shown that TUS "has the potential to be used both as a scientific instrument to investigate brain function and as a therapeutic modality to modulate brain activity," according to a 2019 study, and "could be a useful tool in the treatment of clinical disorders characterized by negative mood states, like depression and anxiety disorders," according to a 2020 study. What is not known, yet, is whether TUS can induce or stabilize lucid dreams, though the Prophetic team is banking on a positive answer to this open question. Its wearable headband prototype, the Halo, was developed with the company Card79 and can currently read EEG data of users. Over the next year, Prophetic aims to use the dataset from their partnership with the Donders Institute to train machine learning models that will stimulate targeted neural activity in users with ultrasound transducers as a means of inducing lucid dreams.
Prophetic does not make any medical claims about its forthcoming products -- Halo is tentatively slated for a 2025 release -- though Wollberg and Berry both expressed optimism about broader scientific research that suggests lucid dreams can reduce PTSD-related nightmares, promote mindfulness, and open new windows into the mysterious nature of consciousness. To explore those links further, Prophetic has partnered with the Donders Institute, a research center at Radboud University in the Netherlands that is focused on neuroscience and cognition, to generate the largest dataset of electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) observations of lucid dreamers, according to the company. The collaboration will also explore one of central technologies behind Prophetic's vision, known as transcranial focused ultrasound (TUS). This non-invasive technique uses low-intensity ultrasound pulses to probe the brain, and interact with neural activity, with a depth and precision that cannot be achieved with previous methods, such as transcranial electrical stimulation or transcranial magnetic stimulation.
At this point, both the possibilities and limits of Prophetic's concept remain unclear. While ultrasound devices have been widely used in medicine for decades, the process of stimulating parts of the brain with TUS is a relatively new development. Within the past few years, scientists have shown that TUS "has the potential to be used both as a scientific instrument to investigate brain function and as a therapeutic modality to modulate brain activity," according to a 2019 study, and "could be a useful tool in the treatment of clinical disorders characterized by negative mood states, like depression and anxiety disorders," according to a 2020 study. What is not known, yet, is whether TUS can induce or stabilize lucid dreams, though the Prophetic team is banking on a positive answer to this open question. Its wearable headband prototype, the Halo, was developed with the company Card79 and can currently read EEG data of users. Over the next year, Prophetic aims to use the dataset from their partnership with the Donders Institute to train machine learning models that will stimulate targeted neural activity in users with ultrasound transducers as a means of inducing lucid dreams.
I can see a lot of recreational potential for this (Score:5, Insightful)
If it turns out to be safe, it sounds like it could be the kind of experience worth paying for.
On the other hand, "what could possibly go wrong?" is one big reason I won't be an early adopter.
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The Lathe of Heaven
That was my first thought as well, it sounds like a device from The Lathe of Heaven. I didn't read the book but did watch two TV movie adaptations, one from 1980 and the other from 2002. https://en.wikipedia.org/wiki/... [wikipedia.org]
The 1980 adaptation is apparently more faithful to the book than the 2002 adaptation but I found the 2002 version more enjoyable. As I recall from the 1980 adaptation the device used to control the protagonist's dreams was some large, kind of steampunk looking, device that seemed rather ab
Re: I can see a lot of recreational potential for (Score:2)
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It could be the ultimate drug.
I've had lucid dreams and they were absolutely the BEST times...I mean, once you become aware that you can do anything with no consequences....well, you can image
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Was this some sort of "rudimentary lathe"?
Re:I can see a lot of recreational potential for t (Score:5, Informative)
There have been lucid dreaming masks available for over 20 years that use LEDs to alert you that you might be in REM sleep. With practice, the flashing lights can trigger you to question if you are dreaming and to try to control your dreams. https://www.sleepfoundation.or... [sleepfoundation.org]
A quick search in Walmart,com reveals 30 books currently available dealing with lucid dreaming. https://www.walmart.com/c/kp/l... [walmart.com]
I've accidentally found myself in three lucid dreams -- one where I tried to convince a person in the dream that it was a dream. I told them "I'll force myself awake and you'll see it was a dream when you wake up too!" I laughed at myself when I woke up and realized a lucid dream is not the same thing as a shared dream.
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I have them periodically, unfortunately I only usually stay in that state for a few minutes (from my perspective anyways).
Oddly enough, regardless of circumstances in the dream, whenever I become lucid I start focusing on the environment. Like "wow, look at details on this leaf. My brain must have a lot of processing power to render this entire forest". "This recreation of my friend from 25 years ago is absolutely perfect. Why can't I remember what I ate yesterday when awake?"
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Ya, but there's no 'machine learning'.
Machine learning and AI are preferred by investors.
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or the Red Dwarf episode "Better than Life"
terminalMan (Score:3)
Next up, continuous unstoppable orgasms. Don't forget to set the timer
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Next up, continuous unstoppable orgasms. Don't forget to set the timer
I recall seeing how that plays out: https://www.youtube.com/watch?... [youtube.com]
The future is coming. (Get it?)
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Next up, continuous unstoppable orgasms. Don't forget to set the timer
I believe they already tried something like that with rats - basically a button for the rats to push directly connected to the pleasure center of the brain. They happily starved themselves to death. I not sure whether they had ethics in those days.
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See Larry Niven's tasps, about 45 years ago. Fiction, of course.
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See Larry Niven's tasps, about 45 years ago. Fiction, of course.
There seems to be a little bit of detail but the nice people at stack exchange seem to have verified that the experiments were done [stackexchange.com] and whilst they didn't actually kill the rats, they did it enough to be sure. In the meantime I learn that rats with an exercise wheel and limited (but sufficient) access to food may also end up starved to death. Since the experiments were done in the 1950s I guess that's the inspiration for the Niven story.
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Funnily enough, it turns out (see other comment with link to stack exchange) that they actually stopped the rats before they actually died, for ethical reasons, so not only did they have ethics, but they were actually reasonably developed in this case.
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Spinal implants exist for women already.
Reportedly it's quite tempting.
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"...is one big reason I won't be an early adopter."
So paranoia to go with ignorance and gullibility.
Re:I can see a lot of recreational potential for t (Score:5, Insightful)
On the other hand, "what could possibly go wrong?" is one big reason I won't be an early adopter.
Hahaha, very much so. Human minds are fragile in some regards. And brains are fragile in some regards as well. Would not want to cause, say, early onset dementia or something like that. Better let those that get a kick out of being early adopters try these things for a decade or so to see what happens. There are always enough bright-eyed morons with no risk-management capabilities, after all.
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There are always enough bright-eyed morons with no risk-management capabilities, after all.
Although that might skew the results a bit :p
Re:I can see a lot of recreational potential for t (Score:5, Informative)
There is an article on the WashPost or NYT (or some major news site, anyways) that soldiers from Iraq who were gunnery personnel are having mental issues. They think it is due to the repeated concussive impact for firing those big guns. One fellow started seeing a very real looking ghost of a small child. Brains are nothing to be toyed with.
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Indeed. And this is just one example.
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On the other hand, "what could possibly go wrong?" is one big reason I won't be an early adopter.
Hahaha, very much so. Human minds are fragile in some regards. And brains are fragile in some regards as well. Would not want to cause, say, early onset dementia or something like that. Better let those that get a kick out of being early adopters try these things for a decade or so to see what happens. There are always enough bright-eyed morons with no risk-management capabilities, after all.
I'll volunteer. Those of us that are seeing fewer and fewer big life events in front of us before the biggest, death? We're willing to play with whatever parts of our bodies for the hell of it. It's not that I dislike life in general, but adding a little zip on the way down to the bottom of the hill can't hurt that much more than what I expect in the end.
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That is basically the only sound reason to do it: Unlikely change of long-term effects because there will likely not be a long-term anyways.
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My grandfather reputedly had extremely vivid lucid dreams every single night. His dreams were as real as his waking, and would go on fantastic adventures.
He died at 78 from an unrelated cancer, but was as sharp as a whip up until the day before he passed.
I doubt there's much harm it could cause psychologically. Physiologically, that's another thing.
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I doubt there's much harm it could cause psychologically. Physiologically, that's another thing.
I tend to agree. And it does sound like a nice capability. But what if, say, after 5 years of doing this too often (because it is a nice escape), you start to develop the most horrible nightmares, your memory goes to shit or you start having hallucinations? Not good at all.
Anyways, looking at their website, I am fairly convinced it is a scam and they have nothing.
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That could be the case.
Anecdotally - my grandfather had a beartrap of a memory. He could effectively play back any life event in his mind as if it was happening again, and had an uncanny ability to memorize things like poetry and song.
I suspect that, once the neural pathway exists for easy access to vivid dreaming, it would become easier for a person to trigger it themselves. I've personally had several vivid dreams in life, and many others which were super-realistic which I couldn't control. It'd be nice t
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Good point.
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If it turns out to be safe,
For now it is totally safe, since they don't know if it is even possible.
It's basically just bullshit startup advertisement. They haven't got anything.
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Agreed.
People with suicidal depression should take the risk, most likely.
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Well, if I were otherwise disabled, and this could help me to make a living anyway, I'd consider it well worth the risk.
But just to have a lucid dream? Thanks, but I'll pass.
Risks always have to be weighed against benefits, insofar as either or both can be quantified.
Here's how it works. (Score:4, Insightful)
Make announcement. Attract investors. Spend money. Declare bankruptcy. Repeat with new idea.
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Given the web-site, yes, quite possibly. It is essentially just a jumble of esoteric promises essentially promising enlightenment or something.
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Make announcement. Attract investors. Spend money. Declare bankruptcy. Repeat with new idea.
A whole new idea? Sounds too much like hard work. Why not just add blockchain or AI to the old idea?
No thanks. Pills will do. (Score:2)
Smaller, cheaper and much more variations to choose from.
Is that lucid? (Score:2)
I thought the deal with a lucid dream is that you are in complete control of the experience, guiding it. If not, then what's the difference between a "dream" and a "lucid dream"?
Personally, I have no way to even take a swing at this; I have aphantasia [wikipedia.org]. I doubt the device here would work for me, as I never dream images (or have them awake, for that matter.) If the device could instantiate dream images, I'd be very interested, of
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However this is LEGAL and doesnt destroy your brain and cognitive ability making you someone people wont want to leave the kids alone with...
Forgive me if I seem skeptical (Score:3)
But I had a pretty bad migraine today (thanks for disrupting my sleep schedule, DST changeover) and I'm fairly certain the generic brand (made in China, what a surprise there) ibuprofen I took is 100% placebo.
So yeah, I kinda have my doubts that ultrasonic neurostimulation (without cutting someone's skull open first, which would probably be a tough sell) induced lucid dreaming is anything more than putting a technobabble spin on good old fashioned snake oil. Shit, I can't even save a buck on a bottle of pain reliever and have it actually be what it claims to be.
Just like that earlier story about the guy who claimed to have "broken" RSA, if it really were possible to directly stimulate specific neurons with a headband and some ultrasonic transducers, there'd be a lot better uses for such an invention. Cure ADHD, or hell... just start with getting rid of fricken migraines.
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That doesn't make any sense. Assuming you could use ultrasonic transducers to "directly stimulate specific neurons" and that doing so could be used to induce lucid dreams, what makes you think that would also mean you could use the same technology to "cure ADHD" or "get rid of fricken migraines"?
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There are already treatments for migraine using TMS:
https://www.ncbi.nlm.nih.gov/p... [nih.gov]
If TUS is more precise, and can be made to do similar things to the brain, it's possible we'll see it also used to treat chronic migraine.
I'm not a candidate for TMS migraine treatment, since (thankfully) mine are not severe or frequent enough and (also thankfully) they seem to be diminishing with age.
NSAIDs are hit-or-miss for me with migraines, unless I take an ibuprofen (neither acetaminophen nor aspirin work for me at a
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the efficacy of TMS on chronic migraine was not significant (OR 2.93; 95% CI 0.71–12.15; p =0.14).
Too bad... Because it is chronic migraine that's killing most of us.
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Have you tried acetaminophen plus aspirin plus caffeine (150mg approx)?
That works for two of my family members who can avoid trypans now, so far.
Also look up the paper on Riboflavin, 200-400 mg/day, divided dosing.
There was a dose-dependent response in the paper, with prevention achieved at 300-400mg for a large number of participants.
Another paper suggests only 40mg can be absorbed at a time and no time-release is yet available. Some people suggest repackaging 400mg capsules into (4) 100mg capsules but ev
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If ibuprofen doesn't work for your migraines, try sumatriptan or rizatriptan.
Other than that, you are right, this ultrasonic lucid dreaming sounds like complete BS. I was a lucid dreamer as a teen, I can no longer do it and I do miss the ability, but, no, I am pretty sure this is not the way for me to start having it again.
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If ibuprofen doesn't work for your migraines, try sumatriptan or rizatriptan.
Other than that, you are right, this ultrasonic lucid dreaming sounds like complete BS. I was a lucid dreamer as a teen, I can no longer do it and I do miss the ability, but, no, I am pretty sure this is not the way for me to start having it again.
I get very occasional migraines like twice a year, and am lucky. I get the freaky aura, and then when it is over, a mild headache. So not bad for me. A couple acetaminophen and I'm good to go. I've seen people become incapacitated, which is why I say I'm lucky.
I think that Thunderfoot reviewed these things, and called bullshit on them. Another pseudo-scientific grift.
Lucid dreaming though. I do it often. I even solve problems with it - last dream before I wake up, if I've been working a problem, and ca
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I was like that until high school - although I used it mostly for entertainment. I had this story going on and I would continue it every night - would start thinking about it lying in bed and I would transition to lucid dreaming. It was the usual heroic stuff, starring myself of course. Not sure how I lost the ability...
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Ibuprofen is pointless if you are having genuine migranes.
See your doctor.
Minority Report (Score:2)
Think ankle bracelets are a thing? I think Tom Cruise did a movie about how this ends when the courts can demand folks wear halo's. You definitely won't own your dreams after this company gets a hold of them.
Minority Report was a pre-documentary.
--
Sometimes, to find the light, you must venture through the dark. - Dr. Iris Henimen
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Think ankle bracelets are a thing?
Certainly among lesbians... or so I've heard.
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Think ankle bracelets are a thing? I think Tom Cruise did a movie about how this ends when the courts can demand folks wear halo's. You definitely won't own your dreams after this company gets a hold of them.
Minority Report was a pre-documentary.
-- Sometimes, to find the light, you must venture through the dark. - Dr. Iris Henimen
I'm hoping this is a failed attempt at a joke, but just in case it isn't?
What hysteria is this? They aren't claiming at all to be able to read your dreams, just to give you better control over them. I mean, I get that tech companies are constantly trying to siphon data from us, but can we try to stay within the realms of reality when bitching about it? There's enough fantasy-fetishists running around the world already.
or you can just use LSD! (Score:2, Interesting)
or you can just use LSD!
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OH, I see is MUCH more for recreational!!
The times I've had lucid dreaming, it was amazing....when you realize you can do ANYTHING at all with no consequences.....amazingly fun.
The trouble is, I find it often hard to stay asleep very long once I become lucid....
Placebo horseshit. (Score:2)
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I used to have lucid dreams all the time, but now I can only lucid dream when I'm nearly stress free, which is almost never. I'd be interested in this product, because I much prefer to consciously pick who I'm fucking in my dreams...
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When I was a kid... (Score:2)
When I was very young, I was able to do this a lot. I'd always go hopping around the neighborhood like 100 feet high. Never quite could get airborne for some reason. A few times I tried going into the girls locker room, but I was too scared to quite make it work, or maybe I just didn't have enough knowledge of the female anatomy to generate the images.
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When I was very young, I was able to do this a lot. I'd always go hopping around the neighborhood like 100 feet high. Never quite could get airborne for some reason. A few times I tried going into the girls locker room, but I was too scared to quite make it work, or maybe I just didn't have enough knowledge of the female anatomy to generate the images.
I had dreams kind of like that too. I'd dream I could be picked up by the wind and then kind of steer myself around through the air by shifting my weight and moving my arms and legs to direct the air. I couldn't get more than a few feet off the ground. Some dreams I had were where I could float over the ground and up walls by maybe a few inches, like I was riding an invisible skateboard or something. I thought this inability to get far off the ground might be because I would not know how things looked f
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When I was very young, I was able to do this a lot. I'd always go hopping around the neighborhood like 100 feet high. Never quite could get airborne for some reason. A few times I tried going into the girls locker room, but I was too scared to quite make it work, or maybe I just didn't have enough knowledge of the female anatomy to generate the images.
I had dreams kind of like that too. I'd dream I could be picked up by the wind and then kind of steer myself around through the air by shifting my weight and moving my arms and legs to direct the air. I couldn't get more than a few feet off the ground. Some dreams I had were where I could float over the ground and up walls by maybe a few inches, like I was riding an invisible skateboard or something. I thought this inability to get far off the ground might be because I would not know how things looked from any greater distances. Now that there's plenty of video from drones flying through the air I have a better idea on what it would look like to fly around like Superman, and had I seen such video at a younger age I might have had dreams where I could fly to greater heights.
I don't have the dreams as often now, but still a few times a year. I jump, then just don't come back down. And somehow, I'm able to . . . not sure how to describe it other than saying it's like swimming. Kick a bit and I go further up. Stop kicking and start to sink. Hands work for directions. Good times.
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I think these are fairly common. I've had them. I could fly, well really in the dream I could levitate, around cities and even worried about high tension lines in the dreams. For me, these types of dreams happened during very happy periods in my life. I'm surprised no one has mentioned the dark side of lucid dreaming, which I have during high stress times. From those running dreams where you can't get away or where your legs won't move to even worse scenarios. I've had dark dreams that cause me to literally jump out of bed screaming. No fun.
My dark dreams trend toward devastated large buildings or intertwined highway overpasses that I have to somehow navigate my way through to find an exit. Lots of those had no way out and I just pray the alarm goes off.
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Invented many thousands of years ago (Score:1)
it's called porn.
How about *any* dreams? (Score:2)
I only rarely remember mine; can remember every dream I've ever had & they've been pretty much all been mundane
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Do you use cannabis chronically?
Dreaming is vitally important to proper emotional integration and should not be abandoned.
One hell of a catch-22 results.
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Do you use cannabis chronically?
Dreaming is vitally important to proper emotional integration and should not be abandoned.
One hell of a catch-22 results.
Have only had weed perhaps a couple dozen times at most in my life and none at all in more than a decade
"Can" doesn't mean what you think. (Score:2)
Headline writer apparently didn't read the summary...
"What is not known, yet, is whether [the device] can induce or stabilize lucid dreams..."
Could be a bad idea. (Score:5, Interesting)
I was heavily into guided meditation, OBE (out of body experiences), lucid dreaming, sensory deprivation meditation, brain hemisphere syncin (hemi-sync ... impressive results) and other new age stuff as a teenager and young man. What others did with drugs I did with this sort of thing. It was a very good learning experience and quite interesting. This stuff actually works although it does need practice.
However, there are people who've done this and gone too far without proper mental preparation and training. They're stuck in lucid dreaming and can _not_ dream lucid anymore, causing them to drift further and further away from reality because they have increasing difficulties discerning imagination and reality. A problem we already have a little too much of in this quasi cyberpunk world of ours, as most of you would agree. Presumably. For some people stuck in lucid dreaming it's living hell. Somewhat like alzheimers, but you're brain is still functioning and you're fully aware that you've lost it. Nasty.
Bottom line: Brain stimulation tech to induce lucid dreaming isn't something trivial. If this really works and isn't just snake oil I'd be very careful with it. You don't want to fry your brain into a lucid loop.
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I was heavily into guided meditation, OBE (out of body experiences), lucid dreaming, sensory deprivation meditation, brain hemisphere syncin (hemi-sync ... impressive results) and other new age stuff as a teenager and young man. What others did with drugs I did with this sort of thing. It was a very good learning experience and quite interesting. This stuff actually works although it does need practice.
However, there are people who've done this and gone too far without proper mental preparation and training. They're stuck in lucid dreaming and can _not_ dream lucid anymore, causing them to drift further and further away from reality because they have increasing difficulties discerning imagination and reality. A problem we already have a little too much of in this quasi cyberpunk world of ours, as most of you would agree. Presumably. For some people stuck in lucid dreaming it's living hell. Somewhat like alzheimers, but you're brain is still functioning and you're fully aware that you've lost it. Nasty.
Bottom line: Brain stimulation tech to induce lucid dreaming isn't something trivial. If this really works and isn't just snake oil I'd be very careful with it. You don't want to fry your brain into a lucid loop.
Do Binaural beats? I do theta waves esp when I'm tired and need to concentrate deeply. Apparently theta waves aren't supposed to do concentration efforts, but I think I have a different noggin wiring than most.
And noted before in this thread that I lucid dream to solve problems. As soon as I solve it, I spring awake. SO finds it funny, because she knows if I jolt upright and look excited, it means I solved some issue. And rather than forgetting the dream a minute after it happens, the dream sticks.
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> For some people stuck in lucid dreaming it's living hell. Somewhat like alzheimers
Can you point to any evaluations of this condition? It sounds fascinating, separate from the tragedy.
I tried one of the techniques you mentioned and probably didn't practice slowly enough because I got a nosebleed for the first time in ten years while mentally reaching. That caused me to back off for now.
Something about it is very real, though very poorly understood.
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If you spend enough time lucid dreaming then when you can lose the ability to tell that you're awake. If both feel equally familiar there's nothing to distinguish a difference.
That doesn't make any sense. The trick to lucid dreaming is learning to tell the difference between reality and dreaming. Dreams are nothing like reality. It is people without lucid dreams that can't tell the two apart!
Also I searched around for this silly idea you can be stuck in lucid dreaming. Everyone who asked got the same answer. No, it isn't a thing.
Prior art (Score:2)
Such devices are usually called a heroin-syringe.
It's not hard, flashing at 10Hz does it too. (Score:2)
Didn't happen all the time, but when it did, it was legit.
Actual VR (Score:2)
Well well well (Score:2)
I designed and built one of these as a kid after reading about the "Lucid Dreamer" device.
Basically a face mask that detects REM sleep and then uses light and sound to signal you.
The idea is that those signals make it into your dream alerting you to the fact you are dreaming. While awake you are supposed to carry the Lucid DReamer about with you and get into the habbit of pressing its "test" button. The test button shows you are awake by flashing a sequence on it's LED's. When awak, that will work, but i
Lucid dream device... Isn't that called a bed? (Score:2)
Plenty of "sleep/dream inventions" but I admit I'm dubious on this one
Key grip (Score:2)
So... (Score:2)
Next generation VR... (Score:2)
We need to open hardware these TUS devices and APIs around them ASAP so people can hack on this. The fitness junkies always oppose moving VR technologies away from needing physical movement but it is really the only way to get fully immersive VR.
With a little bit [by which I mean a lot lol] of effort it could be possible to get some basic logical building blocks to reliably organize on neural networks and build a programmable computer which is being emulated by your own wetware. Imagine skipping right over
I might reserve a unit but (Score:2)
Where is the final price? If it is a couple hundred maybe I'd do it but I have no interest in loaning them $100 toward the development of a $20k headband.
I'll believe it when I see it (Score:2)
Honestly, it sounds more like a scam than "scientists" doing "research." Maybe they have a scientician on staff but unless they're really going to be certified as a medical device I am going to bet this is either a nonfunctional product or pure vaporware.
Study (Score:1)