The quality or state of being easily excited, stimulated, or provoked; the tendency to respond readily to stimuli.
From 'excitable' (capable of being excited) + '-ity' (state or condition), from Latin 'excitare' (to rouse, stir up).
Scientists discovered that excitability runs along a spectrum in humans—it's partially genetic but can be changed by sleep, caffeine, stress, and even exercise, which is why tired people get irritable and energized people bounce off walls!
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