Can Editing 1 Neuron Fix Repetition Loops in LLMs?

In three linesGemma 4 models exhibit repetition loops on long enumerations (up to 95% failure rate). Per-neuron ablation identifies a few MLP neurons responsible: suppressing them via weight edits removes simple loops but not 'doom loops' (infinite self-correction), limited by knowledge gaps rather than removable circuits.

Summary generated by Claude — human-verified