““Introverts are naturally more sensitive because they don’t need a ton of dopamine, the “feel-good” neurotransmitter that your brain produces in response to positive stimuli. Conversely, extroverts can’t get enough. They even love adrenaline, the chemical that your brain produces in the face of fear, so they need bigger and riskier situations to produce the same natural high that an introvert gets from just having a conversation with a close friend. Introverts are also more apt to pay attention to the small details (and an eBay store is a treasure trove of small details).””