Expectations have a lot of power over people as is evidenced by the placebo effect: Patients get pills that have no active ingredient. But the patients are not aware of that. Firmly believing that they are taking an effective drug, they actually get better afterwards. Only their expectations were at play here.
“The placebo effect often works quite well when treating pain and depression,” says Dr. Katharina Schwarz from the Institute of Psychology at the Julius-Maximilians-Universität Würzburg (JMU) in Bavaria, Germany. The mere expectation of getting a drug can alleviate symptoms and make you feel better: “And those are not just the patient’s subjective sensations, it can actually be measured physiologically.”
Expectations alter pain perception
Katharina Schwarz generally studies how expectations influence perception and behaviour. Pain was also a central theme of her doctoral thesis which she completed at the University Medical Center Hamburg-Eppendorf in 2015. One conclusion she draws: If men are told that they are more or less sensitive to pain than women, they will perceive pain differently afterwards.
The experimental set-up: Participants in the experiment were administered different heat stimuli trough a band on their forearm. They were asked to rate the pain they felt on a scale from “no pain” to “unbearable”.
On the next day of the experiment, a leaflet casually informed the men that they were more or less sensitive to pain than women. The information was backed by evolutionary psychological reasons, respectively. One study group was told that men can endure pain particularly well given their ancient role as hunters, for example. The other group read that women had a higher pain threshold because they have to endure the pain of giving birth.
Afterwards, the experiment was repeated. Now, the participants who thought that men were less sensitive rated the pain as being much less intense than on the previous day. Those, however, who had learnt that women have a higher pain tolerance now considered themselves more sensitive to pain than before.
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