They are contagious in the sense that other people may start laughing or yawning when they see you doing it, but they are not diseases.
I thought that because contagious is derived from the Latin "tangere" - to touch, that both laughing and yawning were infectious. I'm not 100% sure though and would welcome a more knowledgeable answer.
Yawning is contagious.
Yes, it is common for people to feel sleepy or have the urge to yawn when they see or hear someone else yawn. This is known as contagious yawning and it happens due to the activation of mirror neurons in the brain, which mimic another person's action, in this case yawning. Contagious yawning is believed to be related to empathy and social bonding.
This phenomenon is commonly referred to as "contagious yawning," where seeing or hearing someone yawn can trigger the same response in others. Scientific studies suggest that contagious yawning may be linked to empathy and social bonding.
Yawning when you see someone else yawn is thought to be a form of social bonding or empathy. It may be an unconscious response triggered by seeing someone you are connected to engage in a behavior, leading to a contagious yawning effect.
Yawning is a sign that the brain is not getting enough oxygen, usually this is because the body is transitioning from sleep to being awake; or that there is not enough fresh air in the room. According to recent studies by scientists, the reason for this infectious yawning is because (their theory) it's a way of us communicating emotionally to each other, and we don't really think about it. It's all physiological, and some things, we may never understand. Yawning is associated with tiredness, stress, overwork, lack of stimulation, or boredom. Yawning can also be a powerful non-verbal message with several possible meanings, depending on the circumstances. In humans, yawning has an infectious quality, i.e. seeing a person yawning, or just thinking of yawning, can trigger yawning which is a typical example of positive feedback. Infectious yawning has also been noted in chimpanzees. The primary reason behind yawning is to control brain temperature. It cools off your brain, much like a fan cools off the inside of a computer. The claim that yawning is caused by lack of oxygen has not been substantiated scientifically. Some claim that yawning is not caused by lack of oxygen, for the reason that yawning allegedly reduces oxygen intake compared to normal respiration. Another speculated reason for yawning is nervousness and is also claimed to help increase the state of alertness of a person-paratroopers have been noted to yawn in the moments before they exit the aircraft.
Yawning is not a disease.
No, because the chicken pox are not contagious
Yawning is contagious.
Nope, it's infectious, but not contagious.
contagious
When you look at someone while yawning you will probably yawn.Some people think it's contagious.
No. Thyroid diseases are not infectious and therefore not contagious.
Lupus is an autoimmune disorder and is not infectious or contagious.
It's contagious?
neither...it does not matter
yawning is contagious only if someone sees you do it ... as a sort of social action.It is not contagious in the disease sense.The physiologic function of yawning is to relieve the imbalance between where the blood flows in the lungs (mainly at the base) and where the air flows (mainly at the apex). Note that this is a problem mostly when you are in an upright posture.Yawning is contagious, at least to humans. Many animals yawn, but only dogs, chimps, and humans are known to yawn after someone else does. There is no conclusive evidence why we yawn to begin with, but it's possible that contagious yawning may have something to do with social bonding and empathy. For example, autistic people tend not to yawn after another person does, and children under the age of four don't do it either. This suggests that yawning after someone else is a sympathetic and social act, similar to unconscious mimicking.When tired, yawning is psychologically "contagious", but not physically contagious in the most common sense of the word.
MythBusters - 2003 Is Yawning Contagious 3-4 was released on: USA: 9 March 2005 Finland: 24 January 2007