Researchers in Tokyo placed rats in a cage with three compartments . One room showed photos of rats in pain , and another with neutral faces . Rats spent more time in the 'neutral ' room suggesting they recognise fear . Comment:
Researchers in Tokyo placed rats in a cage with three compartments . One room showed photos of rats in pain , and another with neutral faces . Rats spent more time in the 'neutral ' room suggesting they recognise fear . Experts believe facial expressions are used to communicate with others .