EDIT:
When you are "aware", you are experiencing neurological activity.
By analogy, the ocean is the same ocean, whether it has many levels of activity and also no activity at all at its simplest state.
During TM practice the mind very gently and naturally becomes aware of quieter levels of this activity until it is directly aware of the simplest state which is naturally free of any form of activity including any level of the thoughts process.
It does not mean that activity physically or mentally is lost in the other levels of this ocean, it simply means that your awareness is opened to its simplest state, which is naturally unbounded state of mind.
Then naturally without any efforts your awareness is aware again of its many levels of thoughts process, and then naturally aware again of its unbounded calm state, etc. etc.
More one practicing this effortless and gentle technique, more one enables to simultaneously be aware of many levels of mental activity, including the simplest state of awareness, which is naturally free of any activity and like Archimedean point, enables the best basis for all levels of activities, whether they are experienced as physical or mental.
Moreover, this simplest state is actually the unified source of both physical and mental phenomena, and therefore enables the natural harmonious linkage among these aspects.