Because that test reveals what the actual qualia of the experience is—what separates all of the information about an experience from the subjective essence of that experience. The qualia of an experience is not simply the ability to recall that experience, or simulate that experience in your mind.
The experience of recalling experiences is itself an experience. The experience of imagining an experience is itself an experience. These internal mental experiences are less vivid than a direct sensory experience is in the present for most people most of the time, but sometimes dreams can be as vivid as waking life. Internal mental experiences still have qualia, and they use the same sensory channels as the direct sensory experience does. You can recall or imagine or dream about how something looks or sounds or feels like etc.
The memory doesn’t have qualia except during the act of recalling it consciously.
Why does that matter?
Because that test reveals what the actual qualia of the experience is—what separates all of the information about an experience from the subjective essence of that experience. The qualia of an experience is not simply the ability to recall that experience, or simulate that experience in your mind.
The experience of recalling experiences is itself an experience. The experience of imagining an experience is itself an experience. These internal mental experiences are less vivid than a direct sensory experience is in the present for most people most of the time, but sometimes dreams can be as vivid as waking life. Internal mental experiences still have qualia, and they use the same sensory channels as the direct sensory experience does. You can recall or imagine or dream about how something looks or sounds or feels like etc.
The memory doesn’t have qualia except during the act of recalling it consciously.