The Pollyanna Phenomenon and Non-Inferiority: How Our Experience (and Research) Can Lead to Poor Treatment Choices
Pollyanna, a popular children’s book written in 1913 by Eleanor H. Porter, introduced the world to one of the most optimistic fictional characters ever created. She always saw the good in people and her approach to life frequently involved playing “The Glad Game”, where she attempted to find something to appreciate in every situation no matter how unfortunate. She was glad about receiving crutches rather than a doll one Christmas because it was great that she didn’t actually need them. She teaches this philosophy to those around her, even her cantankerous Aunt Polly, and the entire town is transformed into a veritable Mayberry, USA. Later, when she actually does require the use of crutches, her resolve is tested but she triumphantly finds a silver lining.
The Pollyanna principle, first described by Matlin and Stang in 1978 and also known as positivity bias, is a psychological tendency for people to place greater importance on, and assume better accuracy of, descriptive statements about them that are positive. This goes on behind the scenes while our conscious brain tends to dwell on what is perceived as negative stimuli. Though many folks do come across as pessimistic, we are subconsciously biased to accept praise and reject criticism. Anyone who isn’t clinically depressed is on some level more like Pollyanna than Eeyore.
This positivity bias also plays a large role in how we remember past events. As has been covered extensively in prior posts here on SBM, and on Dr. Novella’s excellent Neurologica blog, memory isn’t a replayed video or audio recording of prior events and our interpretations of them, but rather is a reconstruction that is prone to errors during processing and editing that accumulate over time. This leads to false memories that feel no less real than our recollection of what happened five minutes ago.
In this case, the Pollyanna principle results in positive information being more accurately processed and recalled than negative experiences. It also causes our memory of negative events to gradually become less negative as the years go by. I couldn’t have done that terribly during my first high school trumpet solo because I remember people telling me it was pretty good afterwards, right?
So what does this have to do with the practice of medicine? Biases that affect memory also impact how physicians and patients interact. I once assumed the overnight care of a child who had undergone a lumbar puncture performed by one of my female colleagues earlier that day. I ordered no tests and performed no procedures during my brief exposure to the family—yet over a year later when I admitted the same child for a completely different reason I was accused of being the terrible doctor who had unnecessarily subjected their baby to a spinal tap during the last hospitalization. Even after I showed them the documentation which proved that I had nothing to do with that (very appropriate) decision, and that I did not put a needle in their child’s spine, they refused to accept the evidence and had great difficulty trusting my diagnosis and recommendations.
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