A negative hallucination is when someone — or an AI — fails to perceive something that is obviously, demonstrably there. While a regular hallucination adds false content that doesn't exist, a negative hallucination is the inverse: deleting real information from your perception. In human slang it maps onto the selective blindness of ignoring red flags, not seeing what's in front of you, or your brain simply refusing to register inconvenient reality. The 'negative' modifier here is technically precise and culturally resonant — it names the specific flavor of self-deception where you aren't inventing problems, you're erasing them.
She had a complete negative hallucination about his behavior — every warning sign was right there and she just did not see it.
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