This article describe that in researches conducted , there remains no doubt what watching TV harm brain development and functioning . Aiming at cortical activity while watching television, researchers found the occurrence of neurological abnormalities: inhibition of left brain activity, which is the important mind aware, analysis of data received, logic, decision, sort, identify. If looking at the screen occurs early in life, child left brain hemisphere does not develop normally, leading to deficiencies of logic and analytical thought, of speech, the construction of phrases, the writing and reading. Watching action movies, horrors, develop hyperactivity and state of epilepsy.