The author investigated gender differences in social leafing among 18 men a
nd 18 women in Japan. The participants were divided into groups of 9 member
s. Ropes were connected to strongly built steel frames set near the ceiling
of the laboratory. Each participant had to pull the rope as through arm wr
estling. The participants engaged in 12 trials-2 individual trials and 10 g
roup trials. In the group trials, the participants believed that only the g
roup's power, but not individual participants' power, was being gauged. The
difference between the data from individual trials and the data from group
trials was adopted as a measure of social leafing. The women tended to loa
f less than the men, and the men's effort suddenly declined when the situat
ion was changed from an individual to a collective work setting. However, t
he women did not show that change. The author interpreted the findings from
the viewpoint of gender difference in the quality of achievement motivatio
n among Japanese participants.