小橋 昭彦 2005年11月23日

The first laugh: New study posits evolutionary origins of two distinct types of laughter
In an important new study from the forthcoming Quarterly Review of Biology, biologists from Binghamton University explore the evolution of two distinct types of laughter ? laughter which is stimulus-driven and laughter which is self-generated and strategic.
お愛想笑いと、ほんとうの笑いは起源が違う。