Meditators have had their brains scanned and parts associated with conceptualization and separation of different sensory states lower their activity, indicating a more holistic state of mind being achieved, free from a subject/object distinction. After enough meditation, this state becomes more or less permanent and it's like a bunch of trains of thought and sensory experience flow together without any separation, kind of like an entire day is a single experience without any concept of self to refer to. Everything has an "otherness" with the familiarity of self.