Thought Primitive is a genre composed entirely through direct BCI transcription of mental states, with a strict prohibition against post-production editing or algorithmic correction. A composer sits with their BCI in full-capture mode and thinks — not in structured musical terms, but in raw associative cognition: memory, sensation, emotion, half-formed images — and the BCI translates the electrical texture of that thinking directly into sound. The results are jagged, structurally incoherent by traditional standards, and intensely personal to the point of discomfort. Thought Primitive pieces often contain audible artifacts of the composer's augmentation hardware — the background hum of a cheap BCI, the skip-stutter of an aging neural interface — that more polished genres would filter out. Practitioners consider these artifacts essential. The genre's aesthetic is one of radical transparency: this is what a mind sounds like, unbeautified. It emerged from the Shelf around 2205, where low-grade BCIs produced more artifact-heavy transcriptions, and the rawness became a point of pride rather than a limitation.