And one of the things he did was to invent the ophthalmoscope,
which I think we mentioned earlier on in the course in looking at the retina.
And he made quite a bit of money doing this.
But he was aware because as a physicist he was very astute in optics.
He knew that the visual system was not a very good optical system.
It was not as good as the lenses in his ophthalmoscope and
he was aware that the image on the retina is actually a fairly
crummy representation as images go.
And what he imagined as a result of this is that in addition to the,
what he called the sensory information on the retina, he was perfectly happy
with the idea that the information on the retina was a valid source of information,
even though it was kind of as I said, crummy.
He thought that you would need something else to improve the quality of what
you got in, again your subjective sense of perception, which wasn't crummy at all.
So that you needed to add to the sensory experience of the image on the retina,
what he called, unconscious inferences drawn from experience.
So this was an empirical idea, the idea that you would use your information
gleaned over your lifetime to improve the sense.
The perceptual sense of the images that you saw by using