This video was published back in April 2013 and netizens are still debating whether this is a fake or an actual incident from a surveillance camera.
The phenomenon was filmed by CCTV cameras in an unidentified residential building. A CCTV camera captured a dark figure, possibly a ghost or demon, who attacked a man in the hallway, according to the YouTube video.
The "ghost" knocks a man down and drags him down the hall for a couple of seconds. Then he lets go and disappears. Reality or a well-choreographed trick? In any case, it is alleged that there were other complaints from tenants and visitors who were intimidated by such encounters.
The Shadow Man, also known as "Shadow Image", "Shadow Creature" or "Dark Mass", is an alleged paranormal entity. Paranormal researcher Heidi Hollis has expressed his belief that the Shadow People are malevolent supernatural personalities.
Several scientific points can be used to explain this phenomenon. This mainly concerns the finding of the cause of "shadow people" in optical illusions or hallucinations under the influence of drugs or other physiological effects on the body.
For example, when stimulating the left temporo-parietal region of the brain, such illusions can arise. Also, these episodes can be caused by pareidolia in the peripheral sections of vision, which can be explained by the fact that the brain often misinterprets unfamiliar objects of shadow / random flashes of light as certain outlines. The phenomenon of "Ghosts" in science is also often associated with pareidolia.
Especially often, the phenomenon of people-shadows is associated with hypnogy (English) - a physical state when a person's consciousness is between sleep and wakefulness. During this state, the person is conscious, but the brain can "raise" images from the subconscious, similar to a dream.
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This linking of Hypnogogia and the Shadow People was done because many people who endured this state later reported about some "moving shadows" and "living rays of light". In the West, Hypnogogia even received the unofficial name "The Phenomenon of the Face in the Dark", just for such hallucinations.