Longitudinal studies allow researchers to look at possible long-term effects of violent video games.
When different research methods yield similar results, one can have more confidence in them.
While the term has several meanings, the most frequent usage refers to two people exploring whether they are romantically or sexually compatible by participating in dates with the other.
Other studies have measured aggression by having participants punish accomplices in the games by blasting them with loud noise through headphones, forcing them to eat hot sauce and putting their arm in icy water.
In field experiments (conducted outside the lab) involving children, aggression has been measured by observing behaviors in interactions with other children, such as pushing, kicking, tripping and hitting. The researcher might not be able to control some variables (such as what video games participants play), to randomly assign participants groups (to play a violent or nonviolent game), or to measure violent behavior, such as assault.
From about 1700 a worldwide movement perhaps described as the "empowerment of the individual" took hold, leading towards greater emancipation of women and equality of individuals.
Men and women became more equal politically, financially, and socially in many nations.