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Scientists Find Rats Aren't Smarter Than Mice, and That's Important
HughPickens.com writes: There has long been a clear hierarchy of intelligence in the psychology lab, with monkeys are at the top, then rats, and finally mice at the bottom, "cute and fluffy but not all that bright." For at least a hundred years, researchers have used rats in their psychology experiments, assuming that they were the smarter of the two lab rodents. Now, Rose Eveleth reports at The Atlantic that new research shows this might not be true, suggesting mice can perform decision-making tasks in the lab just as well as rats can. "Anything we could train a rat to do we could train a mouse to do as well," says Tony Zador. This finding is important because using mice in experiments instead of rats could open up all kinds of new research options. For one thing, scientists have been able to manipulate a mouse's genome in really useful ways, silencing certain genes to figure out what role they play. There are mouse models for everything from Alzheimer's to Parkinson's. Being able to put those mice through the paces of a psychology experiment could help researchers connect diseases with the behaviors they impact.
So where did this idea that rats are smarter than mice come from, anyway? Zador says it's a historical bias. "There was 100 years of practice in training rats. And basically when people tried to treat the mice in exactly the way they treated the rats, the rats seemed smarter," says Zador. In other words, "over the course of 100 years people had figured out how to train rats, and that mice aren't rats." You might think that mice and rats would be basically the same when it comes to these kinds of things, but Zador points out that mice and rats diverged somewhere between 12 and 24 million years ago. For comparison, humans and chimpanzees split somewhere between 5 and 7 million years ago. So it's no surprise that mice behave differently than rats, and that the difference impacts their training in the lab. "The mouse is uniquely placed at the interface between experimental access and behavioral complexity, making it an ideal model for the study of adaptive decision-making. Successful behavioral paradigms, however, rely on targeting designs to the idiosyncrasies of the mouse from the outset, rather than simply assuming that mice are little rats."
So where did this idea that rats are smarter than mice come from, anyway? Zador says it's a historical bias. "There was 100 years of practice in training rats. And basically when people tried to treat the mice in exactly the way they treated the rats, the rats seemed smarter," says Zador. In other words, "over the course of 100 years people had figured out how to train rats, and that mice aren't rats." You might think that mice and rats would be basically the same when it comes to these kinds of things, but Zador points out that mice and rats diverged somewhere between 12 and 24 million years ago. For comparison, humans and chimpanzees split somewhere between 5 and 7 million years ago. So it's no surprise that mice behave differently than rats, and that the difference impacts their training in the lab. "The mouse is uniquely placed at the interface between experimental access and behavioral complexity, making it an ideal model for the study of adaptive decision-making. Successful behavioral paradigms, however, rely on targeting designs to the idiosyncrasies of the mouse from the outset, rather than simply assuming that mice are little rats."
Unless you get their consent first. Just because we're too dumb to figure out their language yet doesn't mean we shouldn't treat them with respect an dignity, because they are fellow mortals.
Unless you get their consent first. Just because we're too dumb to have figured out their language yet, doesn't mean we shouldn't treat them with the respect and dignity due to our fellow mortals.
I find this very interesting. As a result of this study I will have to determine if I should treat my employees differently than I do today. Perhaps less cheese and more electric shocks would be appropriate.
Here's my argument: experiments that depend on measuring problem solving and it's interaction with the brain have never really been better from smarter creatures. What's most useful is behavioral consistency. Between members of the species, and with one individual's performance. The more predictable the baseline is, the more useful results you can extract from fewer tests against your control group.
Sure some thins are too complicated to hope to model so simplistically, like cultural learning, empathy, and most of the other things we use primate models for.
1. Mice
2. Dolphins
3. Humans
I believe there were at least 5 published papers by Dr. Douglas Adams about the subject.
Whoa whoa whoa... We know that for sure now? With real quantifiable evidence, that I can see without a paywall? I musta slept through that part of the newcast... Somebody clue me in...
“He’s not deformed, he’s just drunk!”
These people (not just these authors but almost everyone doing biomed research these days) are detached from reality. They have a study with 10 rats and 10 mice under whatever specific conditions then make these grandiose claims about their (in this case) not significant p-values. I'm sure if the sample size was higher we would be reading "Mice are smarter than rats" or "Rats are smarter than mice". The intelligence of a rat is very influenced by its life, rats that just sit in a cage all day since they were born are very different from those that get experience solving problems, interacting with novel environments, etc. Extrapolating to a species level from these results is ridiculous.
I do however applaud them for plotting the individual data rather than only the averages.
Because there are some things rats just wont do.
http://en.wikipedia.org/wiki/L...
The rat has an estimated 200E6 Neurons and 4.48E11 synapses, and the mouse has 71E6 neurons and ~1E11 synapses.
There is at least some correlation between intelligence and the number of neurons. A cursory search found this: -- Fact or Fiction: When It Comes to Intelligence, Does Brain Size Matte? http://www.scientificamerican....
It would be interesting to find more definitive articles that support or contrast this.
Fuck scientists who torture animals. Testing should be done on willing humans if at all. The fact that you science loving atheist peices of shit don't think it's wrong to subject intelligent lifeforms to this torture says everything about why I although I think science is amazing, I think all you animal torturing, weapon building psychopaths should be put in prison.
And no, I am not religious at all, yes normal intelligent human beings think this way, It is huge cognitive bias that Richard Dawkins loving peices of shit, block out these facts and worship science.
...mice and rats diverged somewhere between 12 and 24 million years ago.
It'd be nice if my field's conclusions could be this broad...
Between this range and the fact that every reproduction is a "divergence", and so the baseline here seems to be divergence from one arbitrary cluster of characteristics given a latin name, and another arbitrary cluster of characteristics given a different latin name...
What does this even mean?
Yes, I know. I'll be shortly told I'm too dumb to understand, instead of an explanation. Fair enough, stipulated. Now go ahead and inform me of stuff.
~ Whence do you come, slayer of men, or where are you going, conqueror of space?
I always new that show was real.
But it takes more than brains to get out of NIMH. you need to be big enough to not get sucked into the ventilation system.
As someone who's had both rats and mice as pets, rats are much more comfortable being handled and are somewhat affectionate. Mice tend to be jumpy and skittish and don't seem to bond to people so much. Lab mice are very retarded and slow (for very good reasons) compared to wild caught mice or their offspring.
Mice might be as smart, but rats are much more fun to work with.
... and nobody's said anything abut niggers yet. Disappointed.
Yeah, I've never understood why that should be. It's not like a larger body has more degrees of freedom to coordinate, and I'm pretty sure the motor control nerves also serve as signal amplifiers, so you don't need more brain cells to drive a larger muscle. The only thing I can think of that might scale with size is the number of sensory nerves in the skin - which would suggest that the portion of the brain associated with processing the input should scale with the square of linear size (or alternately with the 2/3 power of mass).
--- Most topics have many sides worth arguing, allow me to take one opposite you.
But then it's much harder to extrapolate the results to humans.
Mice are smart enough to con researchers into using rats instead. Proof that Douglas Adams was correct..
"You might think that mice and rats would be basically the same when it comes to these kinds of things" [About training the two species]
It doesn't seem like it makes much sense to believe that rats and mice are different enough for one species to be measurably smarter than the other, but not to also believe that they're different enough to have different behavior patterns and responses to various stimuli.
This Space Intentionally Left Blank
we can pay a mouse 1/3 fewer pellets, pack them into 1/5 the space, and still be just as abusive!
if this is supposed to be a new economy, how come they still want my old fashioned money?
I used to work a small zoo. We fed the python snakes either rats or mice. Mostly live animals, since it was hard to get the snakes to eat otherwise. The mice didn't seem to even notice the snakes. They often climbed all over the curled snakes. I remember at one time a mouse climbed up on top and sat on the head of the python and cleaned itself. (before it got eaten)
The rats on the other hand immediately detected the snake as a threat. They hid behind things, keeping themselves obscured from direct line of sight of the snakes.
I have also had both rats and mice as pets. The rat I could teach to come to me when I whistled, the mice not so much... though maybe that was because I never tried to really train the mice. But I'm not convinced.
very funny
if this is supposed to be a new economy, how come they still want my old fashioned money?
Yet another "maybe-ses, perhaps-es, might-ses and may-sies. News worthy as a freshly laid pile of poo. They are both of rodents species after all, and both species are driven onwards by the very same instincts. It is only that one of those species happens to be larger and thus more agile than the other specimen which prefers darker and more hidden areas due to its diminutive size. Brain cranium proportionately pre-sized between both breeds.
"There has long been a clear hierarchy of intelligence in the psychology lab, with monkeys are at the top, then rats, and finally mice at the bottom, "cute and fluffy but not all that bright."
So where do the scientists fit in? Somewhere in the middle? Just above rats? Hmm...
Mice are at the top, followed by dolphins
Having worked in labs with both mice and rats, I'll take a nice Sprague-Dawley any day. They're like little dogs: they hang out, they like to be petted, they're clean and smell nice.
On the other hand, as soon as you lift the lid off the mouse cage, one of those little buggers levitates three feet in the air and rockets off in a random direction, probably sinking their teeth into someone's earlobe. No thanks.
Some anecdotal evidence here, but at least as far as pest control goes rats seem much more intelligent. I can set out a giant glueboard with bait and catch a dozen mice (the rascals keep piling on even with their dead stinking comrades there). Rats, if I set multiple traps out, I may catch several that night, but after that they won't touch the things (at least the adults won't, I'll still catch the stupid teenagers)
It may have something to do with rats having more cautious responses to change than mice, which doesn't necessarily make them smarter.
That's my 2 cents at least
Slartibartfast: [talking about the Earth] Best laid plans of mice.
Arthur: And men.
Slartibartfast: What?
Arthur: Best laid plans of mice and men.
Slartibartfast: Oh. No, I don't think men had much to do with it.
I don't read your sig. Why are you reading mine?
Mice everywhere squeak with joy. "We're number 1. We're number 1. We win the prize" Oh wait a sec...
Well, it has to be said for them that they breed profusely and one does not grow attached to them.
Free, as in your money being freed from the confines of your account.
"Hey you humans. There's a mouse over there. He's really smart. Why don't you fuck with him for a change?" Its the same logic I use when the wife asks me to do something around the house. Mess up a couple of times and she stops asking.
Have gnu, will travel.
I don't think any proper scientists has thought in terms of a hierarchy of intelligence since we discovered that quantifying intelligence was harder than we thought (about a century ago).
But I could certainly see journalists thinking in those terms.
Just for grins, I looked up the difference between mice and rats on Google. It turns out, rats can play the saxophone! Who knew? https://www.google.com/#q=mous...
OK, who thought of this song first upon reading the summary?
http://en.wikipedia.org/wiki/A...
(I have no idea which of the versions listed I've heard.. maybe the Muppet show.. but it's one of those songs where I definitely haven't seen the _original_, or at least not in its entirety, but still know the song.)
People aren't smarter than mice, either.
Go check it out.
A larger muscle has more muscle fibers, so yes, you do need more nerves to drive a larger muscle.
I'm pretty sure the motor control nerves also serve as signal amplifiers, so you don't need more brain cells to drive a larger muscle.
Not necessarily. I can easily imagine larger creatures needing finer motor control compared to their size (note that large humans are often described as "clumsy" and small humans as "graceful"). In a similar vein, I know one proposed theory about why humans are so much weaker than chimpanzees is because we dedicate way more brainpower to fine motor control (one source: http://www.smithsonianmag.com/...).
It's almost like intelligence isn't something that can be easily quantified. Rats might be "smarter" than mice for one test, but the opposite may be true for another test. Maybe we need to redefine what it means to be "smart".
Given the number of small clumsy people and large graceful ones I've seen, I think that's more of a media meme and/or perceptual preconception than an actual trend...
That's an interesting article though, I hadn't thought of the fine muscle control aspect. I suppose neurons do pretty much fire in an all-or-nothing fashion, so it makes sense that if you want a more graduated response you need more nerves to be able to trigger smaller clusters of muscle fiber. A corollary to their theory about apes strength would seem to be that our relative weakness might not be an inherent limit, but a coordination issue. Presumably if all the muscle fibers are still wired up, and if the strength and proportional number is comparable to a chimps then we should, in theory, be able to exert a proportionally comparable force - we would just need to send the activation signal to all the fibers simultaneously. And presumably some aspect of the fine muscle control system interferes with our ability to activate all the "command lines" at once.
I wonder if that might not be something that could be altered somehow - either through biofeedback training or cruder direct physical modification. It doesn't seem like having a wider "control bus" should inherently limit the maximum strength, and their are circumstances in which people display "superhuman" strength, so perhaps there is some sort of limiter in play with an optional override that's only triggered in rare circumstances. If you could learn to activate the override voluntarily it could be incredibly useful - of course whether out bones, joints, and tendons could handle that sort of stress on a regular basis is a different question - seems like I've heard of peoples bones snapping during violent seizures. Then again responsible bodybuilders don't seem to have to much trouble, so perhaps its just one of those things you have to build up to, in essence exercising your tendons rather than the muscles themselves.
Hmm, now that I think of it, that might actually be an explanation for people with "wiry strength" - if they don't have a neural "exertion limiter" then they could be using their muscles at full capacity while the rest of us are limited to only engaging 1/3 to 1/2 of our muscle fibers at once. That certainly seems more reasonable than the idea that their muscle fibers are somehow dramatically stronger than the norm - I mean I would think that would involve some serious mechanical differences to achieve, to the point of potentially causing serious problems in "crossbreeds".
Okay, now I've got to go experiment.
--- Most topics have many sides worth arguing, allow me to take one opposite you.
Intensity of the neural signal is carried by some encoding of the pulses. Think serial rather than parallel. https://en.wikipedia.org/wiki/Neural_coding#Rate_coding states that it mostly looks like a PWM with maybe some data from when the spikes come.
Interesting. But from what I can find (http://en.wikipedia.org/wiki/Motor_unit_recruitment#Rate_coding_of_muscle_force) that only allows for a 2- to 4-fold variation in force - not quite all-or-nothing, but severely limited.
--- Most topics have many sides worth arguing, allow me to take one opposite you.
It totally screws up the Secret of Nymh. :_(
Buuuut... They were genetically enhanced rats, so it still works.
It's ok everybody CRISIS AVERTED!!
Cwm, fjord-bank glyphs vext quiz
I've been in that lab, not as a subject but a friend gave me a little lab tour. I saw the boxes used, spent about an hour there talking to one of the scientists running experiments (not one mentioned in the paper, which may piss them off when they read the entire thing)
According to my friend, Zander is really streaching the results, and leaving out a lot of things. Rats are good at dealing with changing experiments, with mice you may need to start with a new mouse after a change. Lab mantra was and still is rats are smarter than mice.
I'm looking forward to my friend's rant about this, as it promises to be epic.
When they see a mouse, they say "Oh look, a baby rat!" (based on actual experience)
Star Trek transporters are just 3d printers.
"... suggesting mice can perform decision-making tasks in the lab just as well as rats can."
- it's just that they choose not to, so as not to attract the attention of the people who want to stick wires into their brains.