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Sensory Processing Disorder (SPD) is a neurological condition that affects the way an individual's brain processes and responds to sensory information from their environment.

A feeling of immense distress, a sensory overwhelm / autistic overwhelm is a strong reaction caused by the compounded effects of stress, exhaustion, lack of safety, a sense of danger, unmet needs, too much information, noise, sights or sounds, smells or touch.