The experiment began in early November 2012 and was held
from 9:30 a.m. to 11:20 a.m. on each weekday for two weeks.
Participants were recruited at the college. Individuals who were
willing to participate were taken into a behavior laboratory, which
was kept in a condition of constant illumination and at a constant
temperature of 26 C. What is more, during the experiment participants
were not allowed to touch any of the objects that were used
except when required.