Cognitive disengagement syndrome

Cognitive disengagement syndrome (CDS) is a syndrome characterized by developmentally inappropriate, impairing, and persistent levels of decoupled attentional processing from the ongoing external context and resultant hypoactivity. Symptoms often manifest in difficulties with staring, mind blanking, absent-mindedness, mental confusion, and maladaptive mind-wandering alongside delayed, sedentary, or slow motor movements.

Source: Wikipedia — Cognitive disengagement syndrome (CC BY-SA 4.0)