Have you ever heard a strange sound, see ghost flashed, or feeling things that are in the room with you, and then do a weird fear come overwhelmingly? --Ghosts and haunted, may have a scientific explanation, rather than your mind tell you jokes.

It might just sound

Infrasound is between 0.1-20Hz in extremely low frequency sounds. Because the frequencies are too low, without the help of electronic equipment humans can't hear it, but can feel – a large percentage of these low frequencies is also very sensitive.

Infrasound may produce strange effects, including nausea, extreme fear or fear, anxiety, or chills.

Researchers also believe that it is caused by the vibration of the eyeball and affect vision, these vibrations can make you see ghosts.

Ghost phenomena in nature

Sound can be generated through a variety of natural phenomena, storms, unusually strong monsoon weather, unusual weather patterns and certain types of earthquakes are natural sources of infrasound.

Animals, such as elephants also uses a form of infrasound on long distance communications with other elephants and, or felt threatened as a defense mechanism.

Ghost in the machine

In April 1998, Coventry University lecturer Vic Tandy journal social psychological research (Journal of the Society for Psychical Research) published an article entitled the Ghost in the machine article, describing Tandy infrasound experience while working in medical laboratories:

The spectre of his colleagues complained in his laboratory and chill, a cleaner who "saw something" resigned. One evening, Tandy worked alone in the laboratory, I suddenly felt himself being watched, and glimpse of a shadowy figure from the corner. When he twisted it is face to face, the shadow disappears.

The next day, Tandy took a fencing foil to the lab for repair. When he took the sword when it is caught in a vise, it began vibrating violently.

Out of curiosity, Tandy began moving the blade in my room, and finds it in lab Center reacted most strongly, but on the edge of the room stopped vibrating.

Finally Tandy in his laboratory has detected a 19Hz standing wave. Laboratory walls to make sound waves reflected back in the center of the room had a maximum range, the energy to vibration of his sword.

Turns out, the end of the sound waves in the laboratory was the source of a new installation of a fan. When the fan is turned off, infrasound and all it-related "phantom" phenomenon has disappeared.

There seems to be no need to shout "The Exorcist" to it ~

你有听到过奇怪的声音、看见鬼影一闪而过，或者感觉在房间里有东西跟你在一起，然后一种莫名其妙的恐惧压倒性地袭来吗？——对于鬼和闹鬼，可能真的有一个科学的解释，而不是你的意识跟你开的玩笑。

它可能只是次声

次声是在0.1-20Hz之间的极低的频率的声音。因为频率太低，没有电子设备的帮助人类无法听到它，但却可以感受到——很大一部分人对这些低频率也是很敏感的。

次声对人体可能产生奇怪的影响，包括恶心、极度恐惧或敬畏、焦虑或寒战。

研究人员还认为，它通过引起眼球的振动而影响视力，这些振动可以使你看到鬼。

自然界的幽灵现象

次声可以通过各种自然现象产生，暴风雨的天气、异常强烈的季风、罕见的天气模式和某些类型的地震都是自然次声的来源。

动物，如大象也使用一种形式的次声与其他大象及进行远距离通信，或在认为受到威胁的时候作为一种防御机制。

机器中的幽灵

1998年4月，考文垂大学讲师Vic Tandy《社会心理研究》杂志（Journal of the Society for Psychical Research）上发表了一篇题为《机器中的幽灵》的文章，描述了Tandy在医疗实验室工作期间的次声经历：

他的同事抱怨在他的实验室的幽灵感和寒战，一个清洁工人也在“看到某物”后辞职。一天晚上Tandy在实验室里独自工作，突然感到自己被监视了，而且从眼角处瞥到一个模糊的人影。当他扭脸去面对它时，影子就消失了。

第二天，Tandy把一个钝头剑带到实验室进行维修。当他把剑夹在虎钳中时，它开始剧烈振动起来。

出于好奇，Tandy开始在房间里移动这把剑，发现它在实验室中心反应最强烈，但在房间的边缘停止振动。

最后Tandy在他的实验室探测出了一个19Hz的驻波。实验室的墙壁使声波反射回来，在房间的中心产生了一个最大能量的区域，这些能量足以振动他的剑。

事实证明，这个次声波的源头是在实验室尽头新安装的一个风扇。当风扇关闭时，次声波和所有与它相关的“幽灵”现象就消失了。

看来没有必要喊一个“驱魔人”来了呢~