Testosterone is significantly discussed in relation to aggression and competitive behavior. Assertiveness training educates individuals in keeping balance between passivity and aggression. Goodall also observed the tendency for aggression and violence within chimpanzee troops. Men were only better at recognizing specific behaviour which includes anger, aggression and threatening cues. Territory disputes are usually solved by displays of intimidation rather than outright aggression. It is mainly males that are involved in territorial aggression. It also causes increased aggression and insanity. There have been a multitude of studies linking violent video game play with increased aggression. This includes regularly sound produced or perceived in the context of aggression or predator avoidance. He favored a strategy of massive retaliation in response to Soviet aggression. This is due to the association of rebellion with aggression and aggression with masculinity. He alternated between clinginess, petty aggression and extreme childishness. She's competitive in a profession that thrives on verbal aggression and analytical skill. Dolphins engage in acts of aggression towards each other. This species is legendary for its bad temper, aggression, and for its speed.