Date: 1949

"The inner life is a stream of consciousness of such a sort that it would be absurd to suggest that the mind whose life is that stream might be unaware of what is passing down it."

— Ryle, Gilbert (1900-1976)

Date: 1949

"True, the evidence adduced recently by Freud seems to show that there exist channels tributary to this stream, which run hidden from their owner."

— Ryle, Gilbert (1900-1976)

Date: 1949

"Rather, to relapse perforce into simile, it is supposed that mental processes are phosphorescent, like tropical sea-water, which makes itself visible by the light which it itself emits."

— Ryle, Gilbert (1900-1976)

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)