Showing posts with label memory. Show all posts
Showing posts with label memory. Show all posts

Thursday, October 12, 2023

Learning Without Brains

Can creatures without brains think? Many of them can learn, so are they thinking? This article highlights several brainless life forms capable of learning:

Organisms Without Brains

Of course, this premise depends on what we mean by learning. If we think of that activity as a process that requires consciousness, a brain is probably essential. However, the article defines learning as "any change in behaviour as a result of experience." By that definition, creatures such as jellyfish, some plants, and even slime molds can learn, remember, and modify their reactions to the environment accordingly. For example, the beadlet anemone as a rule "violently opposes any encroachment on its territory by other anemones," yet it doesn't show aggression toward its genetically identical clones. Slime molds remember routes to food and use those experiences to guide future foraging. The Venus flytrap also acts as if it has a memory. Another article explores the potential "intelligence" of plants in more detail, discussing how chemical and electrical signals in their transport systems may carry information.

Can Plants Think?

I've probably mentioned in the past a story in which one character asks another, "With what does a plant think, in the absence of a brain?" The skeptical second character who scoffs at the idea of plant cognition might be wrong after all.

The concept of brainless organisms capable of remembering and learning raises the question, again, of how we could be sure of recognizing an intelligent alien if we met one. Suppose they have modes of intelligence that, unlike ours, don't need anything that seems analogous to a brain? How easily could we realize they are actually thinking?

If "learning" means "any change in behaviour as a result of experience," considering what we watch and read in the daily news, we might well doubt whether some Earth-humans with allegedly functional brains have the ability to learn!

Margaret L. Carter

Please explore love among the monsters at Carter's Crypt.

Thursday, April 14, 2022

Slime Mold Intelligence

Slime molds, a type of gelatinous amoebae, despite having no brains, have the capacity to form memories:

Slime Molds Redefine Intelligence

One species "can solve mazes, mimic the layout of man-made transportation networks and choose the healthiest food from a diverse menu." When chopped into multiple pieces and scattered through a labyrinth, a specimen not only reunited its separated bits but modified its behavior to find the most efficient routes. As well as mapping their surroundings and retaining memories of areas they have explored, they apparently "navigate time as well as space, using a rudimentary internal clock to anticipate and prepare for future changes in their environments." The article describes some of the intriguing experiments that revealed slime molds' abilities. Lacking brains or nervous systems, nevertheless they "choose conditions most amenable to their survival" and "remember, anticipate and decide."

I once read a story in which two characters argue about the potential intelligence of some nonliving entity. One man asks, "With what would it think, in the absence of a brain?" The other one counters, "With what does a plant think, in the absence of a brain?" Do slime molds and plants "think"? If we equate intelligence with abstract thought, probably not; if we define it as the ability solve problems through adaptation, intelligence could be attributed to almost any kind of organism. If a centuries-old redwood has thought processes, they might operate on a time scale so different from ours that it couldn't communicate with us. If we visited a world dominated by sapient slime molds, would we recognize their intelligence and vice versa?

Margaret L. Carter

Carter's Crypt

Thursday, March 03, 2016

Memory Hacking

More brain news: It may someday be possible to erase or modify memories or even implant false memories:

Memory Hacking

In the short term, the most practical application of these techniques may be to help people suffering from phobias by changing the emotional impact associated with the relevant memories. A mouse experiment demonstrates the manipulation of the rodent's brain by making it fearful or confident at the will of the experimenter.

This research builds on discoveries that memory is far from the infallible recording of events it was once thought to be, a permanent trace that scientists might someday be able to replay on command. False memories commonly form in everyday life:

"Indeed, new evidence suggests our memories are imperfect and malleable constructs that are constantly changing over time. Each time we recall a memory, we go through the process of revising it. That means any time we recall an old memory, we’re disrupting it. Sadly, the fidelity of our memories degrades over time."

The article introduces a twelve-year-old boy who's a striking exception, a case of Highly Superior Autobiographical Memory. Instead of needing help to recall experiences, he literally can't forget anything. This trait isn't an unambiguous superpower. The ability to forget can be a blessing.

Margaret L. Carter

Carter's Crypt