19h ago

Persona Vectors Emerge Early in LLM Pretraining, Enaction Appears Later

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Original post
OPgavin leech (Non-Reasoning)#1480gavin leech (Non-Reasoning)@GLEECH

Moskvoretskii (Friday): persona vectors emerge right at the start of pretraining. So post-training just elicits? Gothandaraman (Tuesday): but that's not the only selfhood mechanism, there's also enaction (recognition of one's own outputs as one's own) which only emerges in post

1:21 AM · May 26, 2026 View on X
REPLYgavin leech (Non-Reasoning)#1480gavin leech (Non-Reasoning)@GLEECH

https://arxiv.org/abs/2605.13329 https://arxiv.org/abs/2605.25459

gavin leech (Non-Reasoning)gavin leech (Non-Reasoning)@gleech

Moskvoretskii (Friday): persona vectors emerge right at the start of pretraining. So post-training just elicits? Gothandaraman (Tuesday): but that's not the only selfhood mechanism, there's also enaction (recognition of one's own outputs as one's own) which only emerges in post

8:21 AM · May 26, 2026 · 3.2K Views
8:21 AM · May 26, 2026 · 491 Views
Persona Vectors Emerge Early in LLM Pretraining, Enaction Appears Later · Digg