Unit 5 The origins of laughter

Laughter has a primarily (a)   function.

Check (✓) the correct researcher(s) for each statement. Two statements are not connected to any researcher.

Two types of laughter probably emerged about 2 million years apart.

Laughter improves social relationships.

Humans can hear the difference between involuntary and voluntary laughter.

(a)  

Laughter may have emerged as the size of social groups increased.

Voluntary laughter uses the positive effects of involuntary laughter.

Humans can distinguish between laughter among friends and among strangers.

Dolphins also have a form of laughter.

(a)  

Adults are better than children at distinguishing between types of laughter.