tics are involuntary, sudden rapid, recurrent, non-rhytmic, and stereotyped motor movements or vocalizations. tics may be transient or persistent. they often cause impairment in social, inter personal, educational, and vocational functions of people. tic disorders may be accompanied by distractibiliy, impulsivity, restlessness, and obsessive – compulsive symptoms. tourette's disorder is on...

In order to test whether the control of eye movement in response to head movement requires an internal model of head orientation or instead can rely on directly sensing information about head orientation and movement, perceived gravity was separated from physical gravity to see which dominated the eye-movement response. Internal model theory suggests that the oculomotor response should be drive...

revolutionary movements which began in tunis in 2010 immediately impressed all arab countries. these movements have led to many essential changes in the middle east. so far, four presidents have been ousted from power. revolutionary forces in the arab world to achieve their goals used media. so the media played a large role in the revolutionary changes in the arab countries. given the media&apo...