 Why are so many people caught in doom loops of sad or anxious thoughts? New research suggests it might be because their mental maps have stopped updating. So you have this kind of recipe for, you know, turning on the sadness machine and then locking all the doors for other visitors that might interrupt sadness. Fixing our mental maps. This week on Hidden Brain from NPR. Hidden Brain comes on at 11 o'clock this morning right here on Maine Public Radio.