Why Do We Sometimes Remember Dreams
Published: 2014-02-17 - Updated: 2021-02-06
Author: INSERM (Institut national de la sante et de la recherche medicale) | Contact: inserm.fr
Synopsis: In a new study a research team sought to identify which areas of the brain differentiate high and low dream re-callers. The reason for dreaming is still a mystery for the researchers who study the difference between high dream re-callers, who recall dreams regularly, and low dream re-callers... Our results suggest that high and low dream re-callers differ in dream memorization, but do not exclude that they also differ in dream production.
Some people recall a dream every morning, whereas others rarely recall one. A team led by Perrine Ruby, an Inserm Research Fellow at the Lyon Neuroscience Research Center (Inserm/CNRS/Universite Claude Bernard Lyon 1), has studied the brain activity of these two types of dreamers in order to understand the differences between them.
In a study published in the journal Neuropsychopharmacology, the researchers show that the temporo-parietal junction, an information-processing hub in the brain, is more active in high dream re-callers. Increased activity in this brain region might facilitate attention orienting toward external stimuli and promote intra-sleep wakefulness, thereby facilitating the encoding of dreams in memory.
The reason for dreaming is still a mystery for the researchers who study the difference between "high dream re-callers," who recall dreams regularly, and "low dream re-callers," who recall dreams rarely.
In January 2013 (work published in the journal Cerebral Cortex), the team led by Perrine Ruby, Inserm researcher at the Lyon Neuroscience Research Center, made the following two observations: "high dream re-callers" have twice as many time of wakefulness during sleep as "low dream re-callers" and their brains are more reactive to auditory stimuli during sleep and wakefulness. This increased brain reactivity may promote awakenings during the night, and may thus facilitate memorization of dreams during brief periods of wakefulness.
Positron Emission Tomography (PET)
In this new study, the research team sought to identify which areas of the brain differentiate high and low dream re-callers. They used Positron Emission Tomography (PET) to measure the spontaneous brain activity of 41 volunteers during wakefulness and sleep. The volunteers were classified into 2 groups:
- 21 "high dream re-callers" who recalled dreams 5.2 mornings per week in average.
- 20 "low dream re-callers," who reported 2 dreams per month in average.
High dream re-callers, both while awake and while asleep, showed stronger spontaneous brain activity in the medial prefrontal cortex (mPFC) and in the temporo-parietal junction (TPJ), an area of the brain involved in attention orienting toward external stimuli.
"This may explain why high dream re-callers are more reactive to environmental stimuli, awaken more during sleep, and thus better encode dreams in memory than low dream re-callers. Indeed the sleeping brain is not capable of memorizing new information; it needs to awaken to be able to do that," explains Perrine Ruby, Inserm Research Fellow.
The South African neuropsychologist Mark Solms had observed in earlier studies that lesions in these two brain areas led to a cessation of dream recall. The originality of the French team's results is to show brain activity differences between high and low dream re-callers during sleep and also during wakefulness.
"Our results suggest that high and low dream re-callers differ in dream memorization, but do not exclude that they also differ in dream production. Indeed, it is possible that high dream re-callers produce a larger amount of dreaming than low dream re-callers," concludes the research team.
- Night Sweats: Common Causes, Information and Facts : Examines a number of causes of night sweats and excessive body sweating when sleeping.
- Can Eating Foods Such as Cheese Cause Vivid Dreams? : Does eating certain foods before sleep cause you to dream more? Includes a list of foods that are reported to make you have vivid and lucid dreams.
- Acting Out Dreams While Asleep - REM Sleep Behavior Disorder : REM sleep behavior disorder (RBD) can be very dangerous to the people who have it as well as injure those who share a bed with them.
Primary Information Source(s):
Why Do We Sometimes Remember Dreams | INSERM (Institut national de la sante et de la recherche medicale) (inserm.fr). Disabled World makes no warranties or representations in connection therewith. Content may have been edited for style, clarity or length.
In Other News:
You're reading Disabled World. See our homepage for informative disability news, reviews, sports, stories and how-tos. You can also connect with us on social media such as Twitter and Facebook or learn more about Disabled World on our about us page.
Disclaimer: Disabled World provides general information only. Materials presented are in no way meant to be a substitute for professional medical care by a qualified practitioner, nor should they be construed as such. Any 3rd party offering or advertising on disabled-world.com does not constitute endorsement by Disabled World.
Cite This Page (APA): INSERM (Institut national de la sante et de la recherche medicale). (2014, February 17). Why Do We Sometimes Remember Dreams. Disabled World. Retrieved October 16, 2021 from www.disabled-world.com/health/neurology/brain/dreams.php