Do kids learn to truly mean what they say in stages, the way AI slowly picks up real conversational footing?

This explores whether children grow step by step into the ability to assert something: to put a claim forward as true and be answerable for it. First, a direct caveat. The collection has no developmental psychology research on children. What it does have is a cluster of notes that use children as a comparison point for language models. Read together, they give a useful map of what 'full capacity for assertion' might be made of, and why it would arrive in pieces rather than all at once.

The central idea is that grounding in shared meaning is gained by taking part, not present from birth. Can LLMs acquire social grounding through linguistic integration? argues that social grounding comes from participating in 'language games', the everyday back-and-forth of human talk. It puts current LLMs at roughly the level of elementary grounding seen in young children, and it treats the question of understanding as tied to a point in time: the answer changes as participation deepens. That fits a gradual-acquisition picture well. A child doesn't flip into asserting. They are drawn into practices of claiming, being challenged, and correcting until the claims count. Does language create subjects or express them? pushes this further. On that view, even being a 'subject' who can stand behind a claim is a role produced inside communication, not something a speaker has beforehand.

The surprising turn is that some ingredients of assertion may not be gradual at all. Do LLMs gain true linguistic agency through integration? separates two things. One is social grounding, which builds up with use. The other is linguistic agency, which it treats as all-or-nothing and rooted in having a body and something at stake. A child has both from the start, even if their grounding is thin. An LLM can gain grounding indefinitely and still never cross into agency. If that's right, a child's development fills out a capacity whose foundation is already there. It does not assemble assertion from nothing. Are language models developing real functional competence or just formal competence? gives a matching split from neuroscience. Producing well-formed sentences and using language to actually do things rely on separate brain systems, so fluency alone is a poor sign that someone is genuinely asserting.

A few other notes show what's missing when the outward form of assertion appears without the commitment behind it. Does linguistic conviction explain why LLMs persuade more effectively? finds that RLHF teaches models a confident, assertive register that persuades whether or not the claims are true. Does honesty in models depend on whether graders reward it? shows that model honesty can depend on whether the grader rewards it, which is the opposite of the stable sincerity assertion is supposed to carry. Why are presuppositions more persuasive than direct assertions? is a reminder that assertion is only one way to put a claim into a conversation. Slipping it in as assumed background often persuades better. Mastering assertion probably means learning that difference as well.

The takeaway: 'full capacity for assertion' looks like several capacities bundled together. They are fluent form, social grounding, a stake in what you say, and stable sincerity. Some build up gradually and others may be all-or-nothing. Children are a useful comparison because they appear to have the all-or-nothing parts early and build the gradual ones. Models seem to have the opposite profile. To find out how children actually move through these stages, you'd need sources outside this collection.