A recent study was published in the journal Behavioral Research and Therapy This provides evidence that people who experience depressive symptoms have a true pessimistic bias toward positive future events, rather than a more realistic view of the world. Research suggests that while depressed individuals can update their beliefs when desirable things happen, these optimistic changes are fragile and easily reversed.
The study was designed to determine whether the negative thinking patterns seen in depression reflect a true bias or just a lack of normal optimism. For decades, experts have debated the concept of depressive realism, a concept that suggests that depressed people actually see the world more accurately than healthy individuals, who tend to be more optimistic. To test this, the researchers wanted to see how people predict everyday life events and how they adjust those expectations when real life proves them wrong.
“We know that depression has a generally pessimistic view of life. Previous research has shown that people with severe depressive symptoms underestimate the likelihood of positive outcomes in their lives,” said study author Joe Maffly-Kipp, a postdoctoral fellow in the Mood and Individual Differences Lab (OMIND State University The MIND Lab).
“However, little is known about how depressive symptoms are related to learning from experience. For example, if someone thinks that a positive outcome is unlikely, but then it happens, do they then predict that it is more likely in the future? Identifying how learning occurs in depression is important for understanding how/why people develop depression and remain depressed, and may help inform future treatments.”
The scientists focused on ordinary events, such as arguing with a friend or receiving a gift, because these ordinary experiences are most relevant to everyday mood. By tracking how people update their beliefs over time based on actual experiences, scientists hope to uncover the mechanisms that keep people in a depressed state.
The scientists recruited 372 adult participants through an online platform. The sample was specifically selected to include people with either very high depressive symptoms or very low depressive symptoms. Participants completed a survey where they rated a list of 40 common life events.
Half of these events were positive, like a fun trip, and half were negative, like getting a headache. For each event, participants estimated the percent chance that it would happen to them in the next month. At the same time, participants reported whether these exact events had happened to them during the previous month.
The researchers contacted the participants again one month and two months later to repeat the same survey. This arrangement gave scientists three separate time points to see how early predictions matched reality. This allowed them to measure how expected after the participants saw what actually happened in their lives.
Findings indicate that depression is strongly associated with expecting and experiencing less desirable outcomes. People with high levels of anxiety showed a clear pessimism bias, especially regarding positive events. They consistently predicted that positive events were less likely to occur than they were.
People with low levels of depression show an optimistic bias by estimating how good things are going to be. This pattern supports the idea that depression involves an active distortion of reality toward the negative rather than a purely realistic view. The scientists also found that higher levels of depression were associated with less accurate predictions about negative events, regardless of whether the specific prediction was positive or negative.
When people changed their minds over time, the researchers noticed an unexpected pattern. Participants with high depression were actually more likely to adjust their predictions about positive events based on real-world feedback. If a positive event occurs, they easily update their expectations for the next month to be more optimistic.
However, this newfound optimism was surprisingly fragile. In the third month of the study, people with high depression were more likely to retract their optimistic updates, lowering their expectations. Their beliefs about positive events essentially bounced back and forth in a circular pattern.
Conversely, when these individuals updated their beliefs about negative events, these updated expectations were significantly deepened. They were less likely to later retract their predictions about negative events. This suggests that depressed people may internalize more negative thoughts and more quickly dismiss external positive evidence.
“Overall, our findings support the idea that depressed people are more pessimistic, and their beliefs about negative events may change,” Maffly-Kipp told PsyPost. “Beliefs about positive events may be more volatile, which can contribute to cycles of hope and despair in depression.”
The findings cast doubt on the theory that depressed people have more realistic expectations. “While our work showed that people with low levels of depression are more optimistic, we also showed that people with high levels of depression are by definition pessimistic,” explained Muffley-Kepp. “In other words, they predicted positive outcomes because, on average, these events in the next month were less likely than they actually occurred. This suggests that depression is associated with unrealistic negative expectations about one’s life.”
The study has some limitations, such as relying entirely on self-reported surveys and using artificial numerical percentages to measure complex human expectations. Asking people to assign a specific probability to a life event is not entirely natural and may change how they normally process their everyday experiences.
Looking ahead, scientists hope to examine how to help individuals maintain positive expectancy changes.
“We hope to better understand what allows for real, stable learning in depression,” Muffley-Kepp said. “Many treatments for depression are based on the idea that we can help people develop more optimistic ways of thinking about themselves and the world. Our work suggests that the learning process may be more complex than time suggests, and that these new ways of thinking may not last over time. By understanding which positive changes last, and who is most likely to maintain them, we can improve treatment and help people more effectively.”
The study, “Learning from Experience: Depressive Biases and Updated Beliefs About Common Life Events,” was written by Joseph Muffley Cape, Daniel R. Strunk, Robert J. Zhu, and J. C. Fournier.
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