There are certain facts that are the beginning place for psychological study. Impressions are typically the most frequently considered facts. But there is also the fact that there is an awareness of such impressions, such that we can reflect upon our having of impressions. We can consider not only the impression itself, but also the fact that we entertain such an impression.
For example, we are not only aware of 'that/this blue' but we are also aware that 'there is blue'. In the first we experience blue, but in the second we affirm that blue obtains (at least in our experience). The latter is an awareness of blue as existing, as obtaining in the mind. As such, the latter necessitates that the blue we are aware of in the first case engenders a condition or state that is reviewable upon reflection.
However, does the fact of a 'state of awareness' necessitate the existence of a 'subject', or 'that which IS aware of an object/impression'? Does the state of awareness, in other words, contain explicit reference to an immanent subject that simply is aware?