Health

Researchers find brain’s blue spot linked to sleep, memory

A ‘blue spot’ in the brain linked to sleep and memory has been identified by researchers, an advance that may help understand how sleep is regulated.

It has been known for a long time that sleep is good for the brain.

We also know that light is not just for seeing, but also plays an important role in other aspects such as mood.

What we don’t know is how all this happens in our brains.

A team from the University of Liege in Belgium using ultra-high field 7 Tesla MRI demonstrated that the quality of our REM sleep (the part of sleep during which we dream the most) is linked to the activity of the locus coeruleus.

This small brain nucleus, the size of a 2cm-long spaghetti, is located at the base of the brain (in the brainstem).

The locus coeruleus — Latin for “blue spot” — owes its name to its colour when observed in autopsy. It projects to just about every area of the brain (and to the spinal cord) to secrete a neuromodulator called noradrenaline, which is not only important for stimulating neurons and keeping them awake, but also for a whole series of cognitive processes such as memory, emotional processing, stress and anxiety.

Its stimulating activity must diminish to initiate sleep and stop to allow REM sleep. “This allows REM sleep to work without noradrenaline, sorting out the synapses that need to be retained or eliminated during sleep and enabling a new day, full of new experiences,” says Gilles Vandewalle, from the varsity.

Animal research has already shown that the functioning of this small nucleus is essential for sleep and wakefulness. “In humans, little has been verified because the small size of the nucleus and its deep position make it difficult to observe it in vivo with conventional MRI,” said Ekaterina Koshmanova, a researcher in the laboratory and first author of the article published in JCI Insight.

“Thanks to the higher resolution of 7 Tesla MRI, we were able to isolate the nucleus and extract its activity during a simple cognitive task during wakefulness, and thus show that the more reactive our locus coeruleus is during the day, the poorer the perceived quality of our sleep and the less intense our REM sleep.”

This seems to be particularly true with advancing age, as this effect was only detected in the individuals aged between 50 and 70 included in the study and not in young adults aged between 18 and 30. This finding could explain why some people become progressively insomniac with age. These initial results also lay the foundations for future studies on the activity of this small nucleus during sleep and the role it could play in insomnia and in the link between sleep and Alzheimer’s disease.

Also read: Overdose of multivitamins may cause cancer: Study

IANS

Recent Posts

“Are there two laws in this world?”: Former Union Minister MJ Akbar raise concern over global inaction, hypocrisy on terrorism

Former Union Minister MJ Akbar, part of the all-party delegation led by BJP MP Ravi…

36 minutes ago

PM Modi meets Australian Dy PM Marles; lauds 5 years of Strategic Partnership

New Delhi [India], June 4 (ANI): Prime Minister Narendra Modi met with Australian Deputy Prime…

45 minutes ago

Relentless in Adversity: Indian Army leads search, rescue operations in North Sikkim

In the aftermath of the devastating landslide that struck North Sikkim, the Indian Army has…

3 hours ago

Google pauses ‘Ask Photos’ AI Feature to address performance issues

In a move that has raised eyebrows in the tech community, Google has decided to…

3 hours ago

Australian Defence Minister Marles makes first ‘port of call’ at ‘chai’ stall in Delhi

Tapping into a typical Indian habit of starting one's day with tea, Australia's Deputy Prime…

3 hours ago

Paank slams Pakistan over extrajudicial killings in Balochistan; bodies of abducted found in Kalat

Paank condemns the extrajudicial killings of Samiullah, son of Muhammad Hanif, and Bismillah, son of…

4 hours ago