In the 1990s, psychologist Elaine Aron began studying people who described themselves as easily overwhelmed, deeply moved by art, and strongly affected by other people's moods. She found that these experiences tended to come together, and she proposed a single underlying temperament trait: sensory processing sensitivity. People high in it she called Highly Sensitive Persons.

Aron's model describes four features, often summarised as DOES. Depth of processing: thinking about experiences thoroughly and for a long time. Overstimulation: reaching capacity sooner in loud, busy or demanding settings. Emotional reactivity and empathy: feeling things strongly, including other people's feelings. Sensitivity to subtleties: noticing small changes in tone, light, scent or mood that others miss.

Estimates suggest that around 15–20% of people are highly sensitive, and the trait appears in many animal species too. That points to an evolutionary strategy rather than a defect. In any group, it helps to have a minority who notice the faint sound in the grass before everyone else does.

Later researchers developed this into the orchid-dandelion framework, sometimes with a middle 'tulip' group added. Dandelions do reasonably well almost anywhere. Orchids wilt in poor conditions and flourish remarkably in good ones. The key finding, known as differential susceptibility, is that sensitive people are not just more vulnerable to bad environments. They also benefit more from good ones.

This changes how the trait looks. A highly sensitive person in a chaotic, critical or overstimulating setting may seem anxious, fragile or withdrawn. The same person in a calm, supportive and meaningful setting often shows unusual creativity, empathy and perception. The trait stays the same while the environment changes the result.

High sensitivity overlaps with introversion and neuroticism but is not the same as either. Around 30% of highly sensitive people are extraverted. Sensitivity also differs from anxiety: one describes how much you take in, while the other describes how threatening it feels.

This test is not a diagnosis, and sensitivity is not a disorder. It is also distinct from sensory processing difficulties linked to autism or ADHD, although some experiences can overlap. If sensory overwhelm is severely disrupting your life, a professional assessment can help you understand what is going on.

In your Cosmic Dossier, sensitivity often appears alongside The Empath or The Observer, archetypes whose gifts depend on noticing what others miss. The practical lesson for a highly sensitive person is not to toughen up. It is to arrange a life that suits a finely tuned nervous system: more recovery time, quieter spaces, and fewer but deeper commitments.