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Tendency to remember pleasant things better
The Pollyanna principle (also called Pollyannaism or positivity bias) is the tendency for people to remember pleasant items more accurately than unpleasant ones. Research indicates that at the unconscious level, the mind tends to focus on the optimistic; while at the conscious level, it tends to focus on the negative. This unconscious bias is similar to the Barnum effect.

The name derives from the 1913 novel Pollyanna by Eleanor H. Porter describing a girl who plays the "glad game"—trying to find something to be glad about in every situation. The novel has been adapted to film several times, most famously in 1920 and 1960. An early use of the name "Pollyanna" in psychological literature was in 1969 by Boucher and Osgood who described a Pollyanna hypothesis as a universal human tendency to use positive words more frequently and diversely than negative words in communicating. Empirical evidence for this tendency has been provided by computational analyses of large corpora of text. The story of Pollyanna is about an orphaned little girl, who is sent to live with her Aunt Polly, who is known for being stiff, strict, and proper. When thrown into this environment, Pollyanna seeks to keep and spread her optimism to others. This beloved literary character's story shares the message that despite how hard things may seem, a sunny disposition can turn anyone and anything around.

The Pollyanna principle was described by Margaret Matlin and David Stang in 1978 using the archetype of Pollyanna more specifically as a psychological principle which portrays the positive bias people have when thinking of the past. According to the Pollyanna principle, the brain processes information that is pleasing and agreeable in a more precise and exact manner as compared to unpleasant information. We actually tend to remember past experiences as more rosy than they actually occurred. The researchers found that people expose themselves to positive stimuli and avoid negative stimuli, they take longer to recognize what is unpleasant or threatening than what is pleasant and safe, and they report that they encounter positive stimuli more frequently than they actually do. Matlin and Stang also determined that selective recall was a more likely occurrence when recall was delayed: the longer the delay, the more selective recall that occurred. The Pollyanna principle has been observed on online social networks as well. For example, a series of studies by Emilio Ferrara, a computer scientist at the University of Southern California, found that Twitter users preferentially share more, and are emotionally affected more frequently by, positive information. However, the only exception to the Pollyanna principle tends to be individuals suffering from depression or anxiety, who are more likely to either have more depressive realism or a negative bias.

Positivity bias is the part of the Pollyanna principle that attributes reasons to why people may choose positivity over negative or realistic mindsets. In positive psychology, it is broken down into three ideas: positive illusions, self deception, and optimism. Having a positive bias increases with age, as it is more prevalent in adults approaching older adulthood than younger children or adolescents. Older adults tend to pay attention to positive information, and this could be due to a specific focus in cognitive processing. In studies compiled by Andrew Reed and Laura Carstensen, they found that older adults (in comparison to younger adults) purposefully directed their attention away from negative material.

Although the Pollyanna principle can be seen as helpful in some situations, some psychologists say it may inhibit an individual from coping effectively with life obstacles. The Pollyanna principle in some instances can be known as "Pollyanna syndrome" and is defined by such skeptics as a person who is excessively positive and blind towards the negative or real. With regard to therapy or counseling, it is viewed as dangerous to both the therapist and patient.