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Okay, so I know the question is almost exactly like here. However, I didn't quite get answers like I wanted. Could plant life develop sentience, to the point where it becomes as intelligent as humans? Is a brain necessary for sentience? These plants don't have to be completely photosynthetic, they can eat, but would it be possible for them to evolve to be able to form conscious thoughts and intelligence on the same level as humans? (These plants don't even have to be able to move around, they can be stuck in the ground.)

Edit - My question rephrased, in order of importance.

Is it even possible for plants to become sentient? What physical structure would the plants require to become as intelligent as humans? What type of plant would most likely become sentient?

Even though it's not classified as such, I'll consider fungi as a plant.

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If you want to avoid this question being marked as a duplicate, I would suggest that you make efforts to differentiate it from the previous one. It sounds like you're interested in their physical structure and how that might lead to the development of sentience, so I'd focus on that. – Wingman4l7 Jan 23 at 2:29

If it were ever to happen, I'd put my money on mycelial networks. While not technically plants -- mycelium is the underground form of fungi -- I think its structure has a lot of potential.

Scanning electron microscope images of human brain cells (left), and mushroom mycelium (right). SEM human brain cellsSEM mushroom mycelium

The mycologist Paul Stamets posits that fungi possess a kind of intelligence:

The analogies are striking. Brains and mycelia grow new connections, or prune existing ones, in response to environmental stimuli. Both use an array of chemical messengers to transmit signals throughout a cellular web. (One part of a mycelium, for example, can order another to send nutrients from hundreds of feet away.) The similar structures of fungal and neural networks, Stamets believes, reflect the fact that both systems evolved to do similar jobs — and do them with maximum efficiency.

If you're going with the theory that sentience emerges when a network of sufficient size & complexity is constructed with the proper topology, I would keep an eye on the 3.4 square mile patch of Armillaria solidipes in Oregon -- thought to be one of the largest single organisms on the planet.

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I found your website interesting. Perhaps it contains some reasons the menshrooms are exploited here. – XandarTheZenon Jan 24 at 0:23

Short Answer:
Perhaps, but probably not anywhere on Earth.

Long Answer:
In order to determine whether or not a plant could truly become sentient, we must first examine sentience within the human brain, according to the Triune model. This will involve breaking the brain into the parts:

  • The reptilian complex
  • The paleomammalian complex
  • The neomammalian complex

The reptilian complex
Consists of the brain stem and the base of the brain. It serves to carry out all of the brain's instinctual and system-sustenance functions.
As far as emulation goes, this complex is relatively simple. Much of its job can be replicated by either an advanced, localized chemical-messaging system, or even by a decentralized neural network.
Evolving such a complex isn't too unfeasible either. Many plants, such as the Venus fly trap, have already developed primitive versions of these systems. A plant would be most likely to evolve in this fashion if it had a set of one or more tasks (like closing a trap around a fly) which required the analysis of one or more input factors in order to produce one or more output factors.

The paleomammalian complex
Consists of the limbic system nodes housed mostly within the interior of the brain. This section is responsible for emotion and internal motivation relative to behaviors such as feeding, mating, and parenting.
Emulating this section would get a little tricky, and would require the development of a central nervous system and a brain, though the brain itself would probably be about half the size of that of a mouse.
Mouse Brain

As for evolution, this complex would require a rather unique environment, in which traditional methods of mating (pollination) and/or obtaining resources (photosynthesis) are possible and yet not ideal for survival and continuation of the species. An example of this could be an area frequently shrouded by large, dense, slow-moving clouds, or where there is virtually no wind or pollinating insects present.

The neomammalian complex
Consists of the cerebral neocortex, and is the part of the brain responsible for complex thought including social interaction, language, and modeling of future events.
Emulation of this portion of the brain cannot realistically be achieved without a centralized nervous system. At this point, the brain is at least 50% the size of that of a human brain. In addition, the overall sensory and motor/chemical input and output neural nodes within the plant would have to increase substantially.
In order to evolve such a system, the plants would have to be forced by their environment to perform tasks together, like hunting, gathering, and/or competition over territory, in which communication can be extremely advantageous. If this were the case, there would need to be many of them, likely living in small tribes, in close proximity to each other. They would also need to possess resources, such as water, air (carbon dioxide), and/or sunlight, which would be obtained in a collective effort, and would have to be managed by each tribe as a whole.

In order for a biological species to develop intelligence, that species must first be presented with an environment that mandates its development of an intelligence model in order for it to survive. Since the survival tactic utilized by plants relies only on the availability of light, water, and carbon dioxide, as well as a gust of wind or two to carry pollen from one plant to another, it would take a rather unique environment to trigger such a deep-rooted (ha ha) developmental process.

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Why would a plant need advanced information processing? It only has any effect if it can act on decisions.

Does this mean movement? Or deciding when to grow and in which direction?

Given the fungi example, is there a benefit to higher-level planning in expending resources? That could lead to the development of a brain.

Now among animals, consider a fruit fly. It has a nervous system and can make decisions based on input and provide a complex command and control system for flight. But that's nowhere near intelligent.

Once an ecosystem exists where mostly-sessile autotrophs (plants as we know them) or something distinctly non-animal-like develops brains (to use the term loosely), what would then spur it on to increase its brainpower, and what would preclude it?

Note that your fungi example has nothing to do with plants. Fungi are closer related to us than to any plant! A sponge however is an animal. I think the different/surprising thing you wonder about has to do with "well-defined solid bodies" and "rapid and active movement through the environment". You could invent a category of lifeform that defies animalness as we understand it, and develops brains.

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Fungi are more closely related to humans than plants, yes, but they are more physiologically "similar" to plants -- they're immobile, they use the earth as their growth medium, they rely on the air as a medium of gamete exchange, etc. – Wingman4l7 Jan 23 at 3:44
That's what I'm explaining in the paragraph: you don't mean plants as stated in the title, but something that does not have the characteristics associated with (casual-use not biological classification) animals. – JDługosz Jan 23 at 3:48
I can see a use for brains. Think of the Venus Fly Trap--definitely a plant but it has decisions to make. Once you have any use for a brain it could develop and then be put to other uses--say, where best to grow. I can't believe a plant could power a human-level brain, though. – Loren Pechtel Jan 24 at 17:43
Here we got co-evolution of flowering plants and flying insects. Elsewhere maybe the vegetable Kingdom started thinking about which of its neighbours to mate with ( via specialized roots, I'd expect). – nigel222 Jan 25 at 16:39
Excellent idea, @nigel222. – JDługosz Jan 25 at 16:49

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