The study is designed to test the hypothesis that long term memory created by preoperative video information can reduce the incidence of post operative behavioral changes.

Emergence agitation (EA) and Post operative behavioral change (PHC) are unpleasant experiences occurred in children after general anesthesia (GA). Previous study reported that the patient who had marked EA tended to have new-onset of postoperative maladaptive behavioral changes.Both pharmacologic and non pharmacologic interventions such as preoperative video information, hand held video games were used to reduce preoperative anxiety, EA and Post operative behavioral changes. In term of memory creation, short term memory (STM) was created. Later that the formation of memory trace requires time, and that this trace remains fragile until the long term memory formation process has been completed. In this study, the investigators hypothetize that long term memory created by preoperative video information can reduce the incidence of post operative behavioral changes.

Inclusion Criteria:

• outpatient elective surgery
• aged between 3-14 years
• ASA physical status I-II

Exclusion Criteria:

• mental retardation
• patient's telephone contact not available
• emergency case
• having ICU admission plan postoperative