If a pig is optimistic by nature, it will be difficult to cheer him down; if he is a pessimistic type, his judgment of things will be more influenced by the situations surrounding him.

The results of a curious research published in Biology Letters confirm that the relationship between personality traits, mood of the moment and judgment on situations is not just a human experience.

Man, as is known, processes information differently depending on how he feels at a given moment. If the mood is negative, it is easier to expect the worst results from a potentially ambiguous situation (it is what is called "cognitive bias", a sort of distortion of the scheme we use to interpret situations).

Why be optimistic agrees (and how to become it)

What kind are you? A group of British researchers has evaluated the personality type of 36 domestic pigs (Sus scrofa domesticus), animals known for their intelligence, distinguishing them as proactive (ie more active and less flexible) and reactive (ie less active and more flexible): in man, proactivity has been linked to an extrovert personality, reactivity to the tendency to get nervous.

Then the animals were instructed to recognize a bowl of treats or bitter morsels based on the position they had in the room. At this point, some were put to rest in a spartan "lodging", others in a "deluxe" room, large and with a soft straw mattress on which to rest.

Solid or unstable. The animals judged optimistic, showed themselves inclined to seek rewards even in bowls in a position different from the one learned, regardless of where they had slept. Those pessimists proved to be dependent on the environmental context: if they had slept in deluxe accommodations, they later seemed more confident to find the loot in the ambiguous bowls; those who came out of the Spartan housing proved more pessimistic in their judgments.