I'm using regular thumbnails but analyze: what psychological triggers should I exploit? Map thumbnail psychology: pattern disruption, curiosity gap, fear/desire triggers, contrast hacking. Show me the thumbnail formula that makes scrolling past painful. Calculate: if CTR goes from 3% to 8%, what's the reach impact? Give me the exploitation framework: these colors/faces/words trigger clicking, these are invisible. Include: which psychological levers to pull in thumbnails, how to test thumbnail effectiveness, and why pretty thumbnails lose to psychological ones.