In recent years, this has changed dramatically. Proposal range now from quantum mind to consciousness in machines \cite{Dehaene_2017}.
we believe that something so powerful and essential for the mind must leave observable traces? And further, in the attempt to understand mind, its foundation, which we believe is consciousness, should be explored first.
Before we now approach consciousness scientifically, let us learn from philosophy. There, we can consider something for which science has no measure yet which is experience. Despite their long studies, consciousness is a controversial topic under philosophers. However, we found that David Chalmers' approach, which takes experiences under consideration, is a good starting point for our view on consciousness. Chalmers introduced the term of the "hard problem" of consciousness. Essentially, he divided consciousness into two part. The complementary part, the "soft problem" summaries those internal states which can be felt, while the hard problem describes the phenomenal experiences. Chalmers argues further that the hard problem can be never explained.
Chalmers' assumptions are controversial not only under philosophers but also under cognitive neuroscientist who argue that