People use the term “meltdown” cavalierly, but in reference to autism, it’s a very specific thing. When faced with sensory overload, meltdowns sometimes looks like an adult having a tantrum or catatonically shutting down. It’s the body and mind doing whatever they can to put the overwhelming input to a stop—an emotional surge protector, the mental switch when an overflow of information trips the mind’s circuit breaker. Meltdown is a survival instinct.