The fourth facial expression that suggests the person is toxic is 'the micro-glare.' According to the confidence coach, this occurs when 'the brow lowers tightly [and] the eyelids narrow'.

This facial expression that the researchers call "Not face" consists of furrowed brows of "anger", raised chin of "disgust" and the pressed-together lips of "contempt", the study said.

"So as a person is translating between English and sign language they have to dig deep into their soul to be able to express it in the way they should — with their face." "Yes, it's sign ...

They didn't laugh, frown or grimace. Their faces maintained an even expression throughout the test. The people with regular depression, however, still giggled and smiled during Gervais' clips.