Psychologist Susan Meindl writes:
Highly sensitive people…have nervous systems and minds which permit more stimulation to enter without automatically and unconsciously shutting it out, and further, that they then cognitively process the stimulation that they receive in more detail than others do.
Stimulation comes in on all sensory channels: sights, sounds, smells, vibrations, touch.
HSP’s typically respond strongly and quickly reach their natural level of tolerance in loud, bright or chaotic environments.
Managing this kind of overstimulation could be treated as a “technical problem” of reducing environmental intensity or leaving it when possible.
Five kinds of over-stimulation can contribute to depression.
Continued in her article Highly Sensitive People and Depression: Overstimulation May Lead to Depression