Investigation of the Relationship Between Internet Gaming Disorder and Sensorimotor Functions in Adolescents

It is a 20-itemed Likert type scale whose items are grading "Rarely", "Occasionally", "Often", "Most of the time" or "Always" with points of 1,2,3,4,5, respectively. The lowest score that can be obtained from the test is 20 and the highest score is 100. A score of 80 and above is an indicator of significant impairment in functionality and this group was defined as "internet addicted". Scores of "49 points and below" were defined as the "average internet user" who does not have any problems related to internet use in his life.

The pegboard will be placed on table at midline of the body. The height of the table will be same at the participants' chest level. The participants will be asked to place the nine sticks into nine holes as quickly as possible and remove them immediately after finishing. The time will be begin on the first contact with the first stick and stopped last stick dropped.

Ruler Drop Method will be used to assess reaction time. Participants will be made to sit with their dominant arm on table, elbow will be flexed at 90º and forearm will be mid-pronated. The ruler will be stabilized vertically by the examiner while the participants hold at the 5 cm with his/her web space (i.e. thumb and index finger). The participants will be asked to catch the ruler as fast as possible, after the ruler released from examiner's hand. The distance the ruler travelled from the starting point will be recorded as cm. This distance will be converted into time (sec) by using following formula "t =√(2d / g)".

The severity of forward heaad posture will assessed with CROM device according to CROM Procedure Manual. Participants will instructed to sit erect posture with spine away from the chair and feet flat on the floor. The horizontal bar with measured will be placed on the head, the vertical bar, whose lower end will be positioned over the spinal process of the 7th cervical vertebra (C7). After the resting point, where the vertical bar will be on, will be noted, the participants will be instructed to retract their heads as possible. The displacement in the sagittal plane will be recorded in cm.

Joint position error (JPE) was measured to assess neck reposition sense of participants. For this test, the participants will be seated in chair with an erect posture, the examiner will stabilize the CROM device with the Velcro strap on participants head. They will be asked to focus a point on the wall as a feedback for neutral position. After the device will be calibrated to neutral position, the participants will perform an active left and right cervical rotation with eyes opened. This test will be repeated with eyes closed. The difference between reading values on the CROM device each side of rotation starting position and final position of the head (JPE) will be recorded as degree.