As karate competitions played by two athletes, the karate ka that has higher concentration is more successful than
his competitor because it leads thorough consideration to most related stimulant (competitor's action) and
indifference toward other stimulants (like spectators clamor); Also, it causes the athlete can predict competitor‘s
actions, react quickly and get point. In addition, "self-talk" is an important factor that affects athlete‘s concentration;
the karate ka‘s attitude before competition can have an effective impact on his concentration. Optimal selfconfidence
can also affect concentration [12]. Also, a karate ka can increase his concentration by controlling
exciting states. Vealey (1988) declared in his study that sport - confidence in martial arts is very important, since it
causes athletes success and changes evaluation of situations from negative to positive. The athletes that are confide
in themselves and their abilities become less anxious than others and so, they are less worry about negative thoughts.
It causes their concentration increase in competition [13]. Zinsser et al., (2001) believed that optimism is very
important in martial arts because it increases concentration, effort and accuracy and also it prevents from interfering
negative thoughts and excitements