Ineffable Ontological Detanglement .: Introspective Assistance & Mental Analysis Manual
The task set is the individual item within your attention that has a goal and a set of rules and it has stolen the focus of your error correction. Semi-consciously you should pretty much automatically know exactly what thinking methods will be necessary for this task set. If you find out you were wrong anywhere outside a moment of conscious re-establishing, make brain hurt.
Day by day, pretty much every little thing that's entering your life has been established as an error correction system attentional task set. Generally none of them are overly complicated or carry a whole lot of weight.
If you're good at switching task sets, it isn't hard at all to immediately know to adopt a new set of habit formed thinking methods. All your multitasking attentional layer requires is running memory and so should not interfere. If you're trying to think about the other task sets and what they require is different thinking methods that's how you fuck up your multitasking and make brain hurt. Good multitasking means your maintenance systems reduce mental decay between switching task sets and have a comfortable understanding of which task sets are active, your attentional gating has a comfortable grasp on the situation and knows how to comfortably shut off everything irrelevant outside of this localized gating process. Cognitive flexibility is key. Otherwise the act of multitasking will begin to carry far more emotional significance to you than it is worth.
OCD can prevent you from being able to disengage with a task set when necessary, however light ADD or properly stimulated ADD comfortably counters this dysfunction. Unstimulated high ADD means most of your task sets will be falling apart before you.
In moments of stress, high error correction fatigue... Or on drugs, or within certain forms of creative thinking your perception of multiple task sets may begin to blend together. This can be both beneficial or destructive, you may accidentally discover they were pretty similar task sets and do a conscious re-establishment, you may accidentally discover brilliance, you may make brain hurt.