why do you laugh when you get tickled

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When you\’re touched, the nerve endings under your top layer of skin, or epidermis, send electrical signals to the brain. When we are tickled the somatosensory cortex picks up the signals to do with pressure, but the anterior cingulated cortex also analyses the signals. This part of the brain governs pleasurable feelings. Evolutionary biologists and neuroscientists believe that we laugh when we are tickled because the part of the brain that tells us to laugh when we experience a light touch, the hypothalamus, is also the same part that tells us to expect a painful sensation. Laughing when tickled in our sensitive spots (under the arms, near the throat and under our feet) could be a defensive mechanism. Research suggests that we have evolved to send this signal out to show our submission to an aggressor, to dispel a tense situation and prevent us from getting hurt. So why can\’t we tickle ourselves? The cerebellum at the back of the brain tells you that you\’re about to self-tickle so the brain doesn\’t waste up precious time interpreting the signals from the tickle. Bonus fact: Gorillas laugh like us when they\’re tickled. Rats laugh when they\’re tickled too, but they giggle at 50kHz, which is out of our audio range.

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For more videos subscribe to the Head Squeeze channel on YouTube. If you would like to comment on this video or anything else you have seen on Future, head over to our
Facebook or Google+ page, or message us on Twitter. Viewers of the hit A E reality series Live PD, which airs in two-hour blocks on Friday and Saturday nights, have come to expect at least two recurring elements as camera crews follow around six police departments from around the country. The first is that officers will be searching for marijuana in vehicles. (And will usually find it. ) The second is that civilians idling in cars or on front porches will sometimes say they are not offering their consent to be filmed. Can the show really БoutБ suspects by broadcasting their faces on live television without permission? To make sense of this legal quagmire, it helps to know that Live PD is live. While the programБs control center cuts between the various participating police departments in real time, itБs not airing the same way: Producers require a delay, in the event a gruesome crime occurs or an undercover officer is accidentally filmed, among other reasons. The showБs producers wonБt say exactly how long the delay is, though in 2017, executive producer David Doss NBC that itБs typically several minutes. (A representative for A E did not follow up with our request for comment. ) Is that long enough to acquire written consent from involved parties to broadcast their image to millions of viewers?

In some cases, yes. Tulsa, Oklahoma resident Randy Wallace was featured on the show in February 2017 and later criticized the police department for implying he was a gang member. In press interviews, Wallace he signed a waiver when a production team member presented it to him. (The Tulsa PD later declined to renew its agreement to be involved with the show. ) The production, Wallace said, wanted permission to use his image and likeness. But not everyone is presented with forms to sign. In Walton County, Florida, a man who was detained on suspicion of driving a stolen vehicle and handcuffed on the show he was never offered the option of signing any forms and was angry he had been depicted as a criminal. (The man owned the car and he was not arrested. ) Legally, the show was probably within its legal rights on both occasions, thanks to the machinations of the right to privacy laws: Namely, if youБre out in public, you donБt have those rights.

БWhen youБre outside in a public place, you have no expectation of privacy,Б Mark Rosenberg, an attorney specializing in intellectual property law, tells Mental Floss. БYou can video people and use them on television. Б Of course, there are limitations. Cameras for Live PD typically idle outside private residences unless theyБre invited in. Footage of people in doorways is typically captured from where someone passing by would see them from the street. People asked to sign waivers may have been approached by producers because theyБd like to use the footage for publicity purposesБa television commercial, for example, or some other advertisement for the show. БIf theyБre using someoneБs face for advertising, that gets outside whatever newsworthy element may be involved,Б Rosenberg says. Should you ever find yourself detained by police with a full camera crew in tow, donБt expect you need to give them your permissionБor withdraw your consentБto be filmed. Have you got a Big Question you\’d like us to answer? If so, let us know by emailing us at.

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