What it means
You think best alone: on the road, before sleep, in solitude. Intuition tells you before logic does. You often write “for the drawer” — diaries, notes, drafts.
The flip side is that it's hard to voice a thought aloud, especially in front of people; anxious thoughts spin at night.
This isn't about you if you think best in conversation with people and you keep no diaries or notes.
How to check it on yourself
Check it against your past — write your answer down before you look at the chart.
If your Mercury is in the 12th house
What should match. Recall the last year. You had a diary, notes or drafts that you show to no one.
When it’s not about you. Nothing of the kind — this isn't about you.
Your sign and house of Mercury — in the free calculation: build my chart. How we check the rest — the site’s method.