text: Proponents of the hard problem argue that it is categorically different from the easy problems since no 
  mechanistic or behavioral explanation could explain the character of an experience, not even in principle. 
  Even after all the relevant functional facts are explicated, they argue, there will still remain a further 
  question: "why is the performance of these functions accompanied by experience?"[1] To bolster their 
  case, proponents of the hard problem frequently turn to various philosophical thought experiments, 
  involving philosophical zombies (which, they claim, are conceivable) or inverted qualia, or the claimed 
  ineffability of colour experiences, or the claimed unknowability of foreign states of consciousness, such 
  as the experience of being a bat. 
  
  The terms "hard problem" and "easy problems" were 
  coined by the philosopher David Chalmers in a 1994 talk 
  given at The Science of Consciousness conference held in 
  Tucson, Arizona.[4] The following year, the main talking 
  points of Chalmers' talk were published in*The Journal of*
  *Consciousness*
  gained 
  significant attention from consciousness researchers and 
  became the subject of a special volume of the journal,[5][6] 
  which was later published into a book.[7] In 1996, 
  Chalmers published*The Conscious Mind*, a book-length 
  treatment of the hard problem, in which he elaborated on 
  his core arguments and responded to counterarguments. His 
  use of the word*easy*is "tongue-in-cheek".[8] As the 
  cognitive psychologist Steven Pinker puts it, they are about as easy as going to Mars or curing cancer. 
  "That is, scientists more or less know what to look for, and with enough brainpower and funding, they 
  would probably crack it in this century."[9] 
  
  *Studies*.[1] The  publication 
  
  Chalmers on stage for an Alan Turing Year 
  event at De La Salle University, Manila, 27 
  March 2012 