overstimulation

This term is frequently used in psychological and neurodivergent contexts, particularly regarding autism or ADHD, to describe a sensory overload where the brain cannot process incoming data. It carries a connotation of distress and a loss of control, distinguishing it from simple excitement or high energy.

In medical or physiological contexts, the word shifts toward a technical description of biological responses. Here, it refers to the physical saturation of receptors or nerves, often implying a state of dysfunction or diminished response due to excessive input.