With any hallucinations, if you can do functional brain imagery while theyre going on, you will find that the parts of the brain usually involved in seeing or hearing - in perception - have become super active by themselves. And this is an autonomous activity; this does not happen with imagination.
Oliver SacksIt is easy to recollect the good things of life, the times when one's heart rejoices and expands, when everything is enfolded in kindness and love; it is easy to recollect the fineness of life-how noble one was, how generous one felt, what courage one showed in the face of adversity.
Oliver SacksAbout 10 percent of the hearing impaired get musical hallucinations, and about 10 percent of the visually impaired get visual hallucinations.
Oliver SacksAnd so was Luria, whose words now came back to me: โA man does not consist of memory alone. He has feeling, will, sensibility, moral being ... It is here ... you may touch him, and see a profound change.โ Memory, mental activity, mind alone, could not hold him; but moral attention and action could hold him completely.
Oliver SacksThus the feeling I sometimes have - which all of us who work closely with aphasiacs have - that one cannot lie to an aphasiac. He cannot grasp your words, and cannot be deceived by them; but what he grasps he grasps with infallible precision, namely the expression that goes with the words, the total, spontaneous, involuntary expressiveness which can never be simulated or faked, as words alone can, too easily.
Oliver Sacks