Date: w. 350 B.C.

"This explains why, in those who are strongly moved owing to passion, or time of life, no memory is formed; just as no impression would be formed if the movement of the seal were to impinge on running water; while there are others in whom, owing to the receiving surface being frayed, as happens t...

— Aristotle (384-322 B.C.)

Date: 1632

"Looke as it is with a Gold smith that melteth the metall that he is to make a vessell of, if after the melting thereof, there follow a cooling, it had beene as good it had never beene melted, it is as hard, haply harder, as unfit, haply unfitter, then it was before to make vessell of; but after ...

— Hooker, Richard (1554-1600)

Date: November 22, 1990

"I do not feel alive, except insofar as a stream of feeling -- perceiving, imagining, remembering, reflecting, revising, recategorizing runs through me."

— Sacks, Oliver (b. 1933)

Date: 1999

"On its own this trigger, as we can see from the earlier definition, is not going to generate consciousness. Imagine a candyfloss machine with a stick in the centre that then gathers more and more candyfloss as time goes on. Think of the epicentre as the stick in the centre, the burgeoning candy...

— Greenfield, Susan (b. 1950)

Date: 1999

"Perhaps the consciousness of dreaming is the almost random formation of little groups forming in different configurations like pebbles thrown very gently into the water. One can imagine the gentle ripples easily being displaced by the next pebble as it hits the water."

— Greenfield, Susan (b. 1950)