It was noticed that a 7-year-old pupil had been innattentive several times during the lessons. The teacher also noticed that the child had been smacking his lips and had vacant look. There were no falls and convulsions. During such short periods of absence the child didn't react to calling his name. His mother notic such phenomena before but didn't pay much attention to them thinking that the child was deep in thought. What type of epileptic attack (according to the standard classification) is it?