Researchers in Australia tickled the rodents every day for a month to see if it would improve their emotional well-being. By Yan Zhuang MELBOURNE, Australia — It’s generally not a good time to be a ...

Tickle a rat and it will jump for joy, gleefully squeak and beg for more. In addition to describing these delightful reactions to a tickling hand, a new study identifies nerve cells in the brain that ...

In 1994, researchers noticed that when rats anticipated an opportunity to play, they would let out a series of squeaky chirps. These were high-pitched, measured at 50 kilohertz. The researchers began ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. There are many forms of touch in the human vocabulary, like caresses ...

There are two types of tickling: the light, gentle kind that feels itchy, and the armpit- or rib-probing kind that evokes laughter. The former form of ticklishness, called knismesis, is widespread; ...

A tickle in the chest may feel like fluttering or pressure. Many underlying factors can cause this symptom. Some, such as colds and seasonal allergies, may go away on their own. Others may require ...