Like kisina jok mahdi ham has tangayaku that's effect. That's a FACTI. Internal or mental condition. Kyahe that described by his mood. Jumbo persistent rahega Agaram say pooching sad oga likin affect very kar sakta he'll be or she'll be sad for very long time. But usque expression can change from time to time. Or you can say his expression. Expressions are totally depend on the stimuli. Like kuijo khakuchmi though kisiko judge karna sehele hamecha. It's a normal psychological phenomena