Gloomy days and clear thoughts

DelanceyPlace.com has a selection from Drunk Tank Pink by Adam Alter:

Gloomy days help us think more deeply and clearly. The same mental haze that sets in after weeks on a summer vacation muddles the mind from one sunny day to the next. This might seem an outrageous claim, that sunnier days bring on a mental stupor, but it's a claim that's backed with real-world evidence. In one study, social psychologists sprang a surprise memory test on shoppers who were leaving a small magazine shop in Sydney, Australia. Before the shoppers entered the store, the researchers placed ten small ornamental objects on the store counter: four plastic animals, a toy cannon, a piggy bank, and Matchbox cars.
After leaving the store, the shoppers were asked to remember as many of the ten items as possible, and to also pick the ten items from a list of twenty that included the ten correct items and ten new items. The researchers conducted the experiment on fourteen different days across a two-month period, between 11:00 am and 4:00 pm; some of those days were clear and sunny, with others cloudy and rainy. The shoppers recalled three times as many items on rainy days as on sunny days, and were approximately four times as accurate when identifying the ten objects from the longer list of twenty items.
The researchers explained that gloomy weather hampers our mood which, in turn, makes us think more deeply and clearly. Humans are biologically predisposed to avoid sadness, and they respond to sad moods by seeking opportunities for mood repair, thus vigilantly protecting themselves against whatever might be making them sad. In contrast, happiness sends a signal that everything is fine, the environment doesn't pose an imminent threat, and there's no need to think deeply and carefully.
These contrasting mental approaches explain why the shoppers remembered the ten trinkets more accurately on rainy days: the rainy days induced a generally negative mood state, which the shoppers subconsciously tried to overcome by grazing the environment for information that might have replaced their dampened sad moods with happier alternatives. If you think about it, this approach makes sense. Mood states are all-purpose measurement devices that tell us whether something in the environment needs to be fixed. When we're facing major emotional hurdles such as extreme grief, an injury that brings severe pain, or blinding anger, our emotional warning light glows red and compels us to act.  For most of the time we sail smoothly through calm waters, allowing much of the world, including small trinkets on a store countertop, to pass by unnoticed.

Rico says he'll take sunny days and let the trinkets go...