During the paradoxical phase of sleep the brain activity is almost the same as during wakefulness.
Scientists from Stanford University have conducted monitoring brain activity of the fish and noticed that they are going through the phases of sleep similar to slow and paradoxical sleep in humans. However, it is worth considering that the fish brain differs from the human brain, so full compliance sleep phases can not speak, reports the online edition of the Chronicle.info with reference to zn.ua.
During the phase of slow sleep, the human brain remains almost calm, slows the heartbeat, and the muscles relax. But in the phase of paradoxical sleep brain activity is almost the same as when awake, the eyes move, and the heartbeat accelerates.
In the new study, researchers monitored the brain activity during sleep fish-Danio. To dip the fish sleep in water or added drugs that stimulate slow or paradoxical sleep in mammals; or juveniles are not allowed to rest in advance for the whole night, and forced to constantly move and sweat the day, after which they were ready to sleep and under the microscope. All this allowed to observe the activity of the fish brain during sleep and to detect two different pattern of activity.
One of them was like a slow dream, he had weak, short-lived flashes of individual neurons. The second phase was characterized by high brain activity, which covered it entirely. However, researchers are not in a hurry to call these phases of slow and paradoxical sleep because the brain of fish is significantly different from the human brain.