A new study suggests that our brain does not treat time and place as separate ideas, but as parts of the same process.
This finding may help explain why people with Alzheimer’s disease often lose both their sense of time and their sense of location at the same time. The research was carried out at the University of Oslo and published in the journal Cell Reports fileciteturn0file0.
Alzheimer’s disease is the most common form of dementia. Around 55 million people worldwide are living with dementia today, and this number is expected to grow rapidly in the coming decades.
One of the early signs of Alzheimer’s is that people become confused about where they are or what time it is. They may forget familiar places or lose track of daily routines.
Scientists have long known that memory is not just about remembering facts. It also includes remembering when and where things happened. This type of memory is called episodic memory. For example, when you remember a meal, you may recall the place, the people, and the time it happened.
In this study, researchers wanted to understand how the brain connects time and place. They focused on a part of the brain called the retrosplenial cortex, which is located near the hippocampus. The hippocampus is already known to play a key role in memory.
The researchers designed an experiment using mice. The mice were given a simple task involving smells. First, they smelled one scent, then there was a short pause, and then they smelled another scent. If the two smells were different, the mice received a reward. If the smells were the same, they did not.
At first, the mice did not understand the task. But after training, they learned to remember the first smell during the short waiting period. This allowed them to decide correctly when the second smell appeared.
While the mice performed the task, the researchers observed their brain activity. They found two important groups of nerve cells. One group responded to specific smells. The other group became active during the waiting period.
These second cells worked in a sequence, passing signals from one to another, almost like a chain. This helped the mice keep track of time while also remembering the smell. The researchers found that this pattern of activity was very similar to how the brain tracks movement through space.
This suggests that the brain uses the same system to process both time and space. Instead of treating them as separate, the brain combines them into one continuous experience.
This finding may help explain why people with Alzheimer’s disease often lose both senses together. When the brain network is damaged, both time and place memories are affected.
In reviewing these findings, the study provides a new way to think about memory and brain function. It shows that the brain works in a more integrated way than previously thought.
However, the study was done in mice, so more research is needed to confirm how this works in humans. Even so, the results offer an important step toward understanding dementia and may help guide future treatments.
If you care about Alzheimer’s, please read studies about Vitamin D deficiency linked to Alzheimer’s, vascular dementia, and Oral cannabis extract may help reduce Alzheimer’s symptoms.
For more information about brain health, please see recent studies about Vitamin B9 deficiency linked to higher dementia risk, and results showing flavonoid-rich foods could improve survival in Parkinson’s disease.
