Introducing the brain: cuttlefish pass child's test (Introduction)

by David Turell , Wednesday, November 15, 2023, 16:15 (164 days ago) @ David Turell

In a food foraging study:

https://www.sciencealert.com/cephalopods-have-passed-a-cognitive-test-designed-for-huma...

"Cuttlefish were given a new version of the marshmallow test, and the results may 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.

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"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.

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"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.

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"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." (my bold)

"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."

Comment: note my bold. It is not clear how much deep cognition is happening. That cuttlefish make choices when foraging is obvious. And they must delay until the choice is made.