Jumping spiders experience a stage of sleep called REM!

Sleep is one of the events characterized by distinct cycles of brain activity. However, the most well-known type is probably rapid eye movement sleep under closed eyelids, or REM sleep, which is accompanied by a loss of muscle control. It is interesting to know that REM sleep has been detected in vertebrates, many mammals and birds. Also, lizards have been recorded as experiencing this type of sleep! Understanding the sleep of creatures beyond vertebrates can be a bit challenging, because determining their sleep type is not very clear and many of these animals do not have the same eyes as vertebrates and their type of movement! For example, flies are among the same group of creatures, because they have to move their whole head so that the eyes can move and change direction! However, an international team of researchers identified a group of jumping spiders that can change the inner parts of the eyes during sleep! The most interesting part of the research is that spiders experience all the signs of REM sleep, from rapid eye movements to muscle contractions.

BingMag.com Jumping spiders experience a stage of sleep called REM!

Sleep is one of the events characterized by distinct cycles of brain activity. However, the most well-known type is probably rapid eye movement sleep under closed eyelids, or REM sleep, which is accompanied by a loss of muscle control. It is interesting to know that REM sleep has been detected in vertebrates, many mammals and birds. Also, lizards have been recorded as experiencing this type of sleep! Understanding the sleep of creatures beyond vertebrates can be a bit challenging, because determining their sleep type is not very clear and many of these animals do not have the same eyes as vertebrates and their type of movement! For example, flies are among the same group of creatures, because they have to move their whole head so that the eyes can move and change direction! However, an international team of researchers identified a group of jumping spiders that can change the inner parts of the eyes during sleep! The most interesting part of the research is that spiders experience all the signs of REM sleep, from rapid eye movements to muscle contractions.

Spiders like to nap just like humans!

BingMag.com Jumping spiders experience a stage of sleep called REM!

It is interesting to know that the mind of spiders and especially jumping spiders, considering their size and small nervous system, is more active than what is thought. has it; Apparently even these little creatures need a nap sometimes just like us. In fact, about a year ago, some members of the same research team reported that they saw sleep-like behavior in these spiders. In this way, the spiders tie webs to the plants at night and hang on them until the morning when they seem to be sleeping. In this case, researchers are given the opportunity to avoid one of the biggest challenges in the study of sleep in different species!

Generally, the eyes of jumping spiders are made of structures called retinal tubes. By moving them, the scope of the spider's vision is directed to the desired location. Of course, in adult spiders, these retinal tubes are not visible due to the presence of pigments in the spider's hairy skin; But since young (freshly hatched) spiders have transparent bodies and need time to produce these pigments, they can be good options for tracking retinal tubule movements. Therefore, the researchers came to the conclusion that with the existence of young spiders, there is an excellent opportunity to investigate the REM phase during the night rest of these creatures.

Researchers in this research admit that the most obvious indicator of sleep in the REM phase is eye movement. On the other hand, mobile eyes have evolved in only a few ancestors of these creatures (such an adaptation is not seen especially in insects and most terrestrial arthropods!) compared to species that have this limitation! In this regard, the limitation of the absence of moving eyes in jumping spiders is not seen; So, the researchers turned off the lights in their lab and allowed this species of spiders to enter a state of sleep; Then they tracked every movement using an infrared camera!

Do rapid eye movements really indicate REM sleep in jumping spiders?

BingMag.com Jumping spiders experience a stage of sleep called REM!

As is true in mammals, spiders periodically experience rapid eye movement, or in other words, rapid movement of the retinal tubes. Although this event is slightly different from one example to another, in general, REM sleep in most spiders repeats itself in the same period of time and periodically (fixed periods)! Another important factor that was investigated in this type of spider was the movements of the retinal tubes, which are often accompanied by the contraction of the spiders' legs. It is interesting to know that about 40% of eye movement periods in jumping spiders were accompanied by leg contraction; However, every leg contraction that occurred during the sleep period was definitely associated with the eye movement of this creature.

Although only 40% of the eye movement periods were associated with spider leg contractions, every leg contraction was definitely associated with movement. The creature's eye was connected!

Some researchers believe that rapid eye movements in the REM phase are the product of replaying visual memories during sleep. Therefore, in a laboratory environment, spiders can be exposed to different visual stimuli to force them to perform certain patterns in the eyes; Then you can turn off the lights and observe whether the same pattern repeats itself during sleep!

Of course, the above does not mean that these behaviors definitely indicate the REM phase in This is the type of spiders, but the action of these movements is completely similar to what happens in human REM sleep! In the end, it should be noted that the researchers point out that the investigation of these REM sleep-like behaviors in other organisms can challenge our understanding of this sleep state more than under and Let's know its consequences in a more precise way.

  • Climate change can accelerate the progress of diseases in humans!

Source: arc TECHNICA

Leave a Reply

Your email address will not be published.