Absent-mindedness
The term concentration of fault, lack of concentration, indicates a weakness or impairment of ability to keep his concentration focused on an activity, for example.
The term is used in medicine, pedagogy and in the psychotherapeutic and psychiatric field as a symptom description.
At what level of complaints of a disturbance in attention must be spoken ( in the pathological sense) is not defined.
Concentration disturbances can have organic, psychosomatic or neurological causes and can be observed in different thickness.