Posted on 12/02/2022 10:47:54 AM PST by Red Badger
Last year, a test of cephalopod smarts reinforced how important it is for us humans to not underestimate animal intelligence.
Cuttlefish were given a new version of the marshmallow test, and the results appeared to demonstrate that there's more going on in their strange little brains than we knew.
Their ability to learn and adapt, the researchers said, could have evolved to give cuttlefish an edge in the cutthroat eat-or-be-eaten marine world they live in.
The marshmallow test, or Stanford marshmallow experiment, is pretty straightforward.
A child is placed in a room with a marshmallow. They are told if they can manage not to eat the marshmallow for 15 minutes, they'll get a second marshmallow, and be allowed to eat both.
This ability to delay gratification demonstrates cognitive abilities such as future planning, and it was originally conducted to study how human cognition develops; specifically, at what age a human is smart enough to delay gratification if it means a better outcome later.
Because it's so simple, it can be adjusted for animals. Obviously you can't tell an animal they'll get a better reward if they wait, but you can train them to understand that better food is coming if they don't eat the food in front of them straight away.
Some primates can delay gratification, along with dogs, albeit inconsistently. Corvids, too, have passed the marshmallow test.
In 2020, cuttlefish also passed a version of the marshmallow test. Scientists showed that common cuttlefish (Sepia officinalis) can refrain from eating a meal of crab meat in the morning once they have learnt dinner will be something they like much better - shrimp.
However, as a team of researchers led by behavioral ecologist Alexandra Schnell of the University of Cambridge pointed out, in this case it was difficult to determine whether this change in foraging behavior in response to prey availability was also being governed by an ability to exert self-control.
So they designed another test, for six common cuttlefish. The cuttlefish were placed in a special tank with two enclosed chambers that had transparent doors so the animals could see inside. In the chambers were snacks – a less-preferred piece of raw king prawn in one, and a much more enticing live grass shrimp in the other.
The doors also had symbols on them that the cuttlefish had been trained to recognise. A circle meant the door would open straight away. A triangle meant the door would open after a time interval between 10 and 130 seconds. And a square, used only in the control condition, meant the door stayed closed indefinitely.
In the test condition, the prawn was placed behind the open door, while the live shrimp was only accessible after a delay. If the cuttlefish went for the prawn, the shrimp was immediately removed.
Meanwhile, in the control group, the shrimp remained inaccessible behind the square-symbol door that wouldn't open.
The researchers found that all of the cuttlefish in the test condition decided to wait for their preferred food (the live shrimp), but didn't bother to do so in the control group, where they couldn't access it.
"Cuttlefish in the present study were all able to wait for the better reward and tolerated delays for up to 50-130 seconds, which is comparable to what we see in large-brained vertebrates such as chimpanzees, crows and parrots," Schnell said back in 2021.
The other part of the experiment was to test how good the six cuttlefish were at learning. They were shown two different visual cues, a grey square and a white one.
When they approached one, the other would be removed from the tank; if they made the "correct" choice, they would be rewarded with a snack.
Once they had learnt to associate a square with a reward, the researchers switched the cues, so that the other square now became the reward cue.
Interestingly, the cuttlefish that learnt to adapt to this change the quickest were also the cuttlefish that were able to wait longer for the shrimp reward.
That seems like cuttlefish can exert self control, all right, but what's not clear is why.
In species such as parrots, primates, and corvids, delayed gratification has been linked to factors such as tool use (because it requires planning ahead), food caching (for obvious reasons) and social competence (because prosocial behavior – such as making sure everyone has food – benefits social species).
Cuttlefish, as far as we know, don't use tools or cache food, nor are they especially social. The researchers think this ability to delay gratification may instead have something to do with the way cuttlefish forage for their food.
"Cuttlefish spend most of their time camouflaging, sitting and waiting, punctuated by brief periods of foraging," Schnell said at the time.
"They break camouflage when they forage, so they are exposed to every predator in the ocean that wants to eat them. We speculate that delayed gratification may have evolved as a byproduct of this, so the cuttlefish can optimize foraging by waiting to choose better quality food."
It's a fascinating example of how very different lifestyles in very different species can result in similar behaviors and cognitive abilities.
Future research should, the team noted, try to determine if indeed cuttlefish are capable of planning for the future.
The team's research was published in Proceedings of the Royal Society B.
A version of this article was first published in March 2021.
Cephalopods are very intelligent, especially considering their lifespans.
Biden can’t.
And brain size!..................
😉😂👌👍...................................
You have no idea how important this information is to my plans to use cuttlefish for world domination.
Had the opportunity to observe an aquarium of cuttlefish during feeding time at the zoo. It’s fascinating to watch as they quickly change their coloration in response to the stimuli.
Cthulhu!.................
Interesting.
I believe it is a sort of ‘language’.......................
Those things is SMRT!
Careful now. Cthulhu might take offense and destroy all of humanity.
Perhaps they just don’t like crab meat. So, they are not like humans in that a human can actually be taught. The only thing the Cuttlefish can do is somewhat appear, to the human, to be learning.
You need the right kind of Lab Assistants to help you conduct a broad ranging experiment like that one.
Not told was how long it took to ‘teach’ cuttlefish that version of the Marshmallow Test.
How many individual fish involved per test?
Is a Cuttlefish a schooling type of fish, inclined to follow a leader or are they more inclined to act independantly when present as a group?
I would think most small fish are inclined to travel, feed and react in formation, or as a ‘school’.
> This ability to delay gratification demonstrates cognitive abilities such as future planning, and it was originally conducted to study how human cognition develops; specifically, at what age a human is smart enough to delay gratification if it means a better outcome later.
In some humans, this ability never develops.
Cuttlefish are loners, IIRC.....................
The cuttlefish cousin, octopus, is very smart.
A local bar owner, years ago, had a octopus in the bar aquarium.
It would rearrange the objects in the aquarium to it’s satisfaction and the bar owner would put them back where he wanted them.
But the next morning they would be right back where the octopus wanted them.
He finally gave up..................
I would’ve been the kid that didn’t eat the marshmallow, not because I was patient, but because I don’t like them. Although if it was a Rice Krispie treat, all bets are off. Those things are yummy!
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