Many people living with Parkinson’s disease say something that can be frustrating and confusing.
They feel like their memory or thinking is getting worse, but when they take medical tests, the results often come back normal.
This gap between how people feel and what tests show has puzzled doctors for years. A new study now offers an important explanation.
The research was led by scientists at Boston University and published in the journal Neuropsychology. It focuses on something called metacognition, which simply means how people judge their own thinking ability.
In everyday life, this includes how confident someone feels about their memory, attention, or problem-solving skills.
Parkinson’s disease is a condition that affects the brain and becomes worse over time. It is best known for movement problems such as shaking, stiffness, and slow movement.
However, it also affects mood, sleep, and thinking. Some people begin to notice changes in how they think even before the physical symptoms appear. This early stage is sometimes called the prodromal stage.
In this study, researchers looked at data from a large group of people. They included 468 people who had already been diagnosed with Parkinson’s disease and 817 people who were in the early stages before clear movement symptoms. The goal was to compare how these individuals felt about their thinking with how they actually performed on cognitive tests.
The results showed a clear pattern. Many people who felt that their thinking was getting worse did not show measurable problems on objective tests. Instead, their concerns were linked to something called a negative metacognitive bias. This means they were judging their own thinking more harshly than what tests suggested.
The study also found that this negative bias was strongly connected to mental health. People who had higher levels of depression or long-term anxiety were more likely to feel that their thinking was poor, even when it was not. This connection was seen both in people with Parkinson’s disease and in those in the early stages.
Over time, this pattern became even stronger. In people with Parkinson’s disease, the negative bias increased over a period of 12 months. This suggests that feelings about thinking ability can worsen even if actual cognitive function does not change much.
These findings are important because they show that cognitive complaints should not be ignored, but they also should not always be taken as a sign of brain decline. Instead, they may reflect emotional factors such as anxiety and depression.
The researchers suggest that treating these mental health conditions could help improve how people feel about their thinking. There are already effective treatments available, including medications and therapies such as cognitive behavioral therapy. These approaches may help reduce anxiety and depression and improve confidence in thinking abilities.
The study also highlights the need for doctors to better understand patients’ concerns. When someone says they feel their thinking is getting worse, it is important to look at the full picture, including emotional well-being, rather than relying only on test scores.
However, the study has some limitations. It does not prove that anxiety or depression directly cause the negative bias, only that they are strongly linked. More research is needed to understand how these factors interact over time and whether treating them can fully change how people judge their thinking.
In conclusion, this research provides a new way to understand cognitive concerns in Parkinson’s disease. It shows that how people feel about their thinking is influenced not only by brain function but also by emotional health. By addressing both, doctors may be able to improve quality of life and help patients feel more confident.
If you care about Parkinson’s disease, please read studies that Vitamin B may slow down cognitive decline, and Mediterranean diet could help lower risk of Parkinson’s.
For more information about brain health, please see recent studies that blueberry supplements may prevent cognitive decline, and results showing Plant-based diets could protect cognitive health from air pollution.
