Key
points on visual the visual system
- Photoreceptors are not on the
surface of the retina
- There are blood vessels over the
retina
- There is a blind spot in the
retina at the optic nerve
- The retinal image is inverted
Inter-species Sensory
Differences:
- Cats do not taste sweet
- Insects see infrared
- Frogs only see what moves
Qualia are not properties
of matter
They are properties of
mind
Examples of qualia are:
Reality is not recorded directly, the
mind makes a model of reality and stores
them as representations.
Our perceptions and our dreams are
strongly influenced by our mind's stored
representations.
Miller-lyer
illusion: >––––<
vs
<––––> is
infact just as long as although both
lines are the same length, we typically
percieve the one on the left to be longer
(if properly drawn.) this illusion partly
culturally determined (societies that
have little or no experience angular
architecture are less susceptible than
westerners to this phenonomon.
| Stimulus
- |
| Tactile
vision substitute |
A camera registers a
picture, then converts it to
a pixilated image map so that
pins in the back of a chair
are able to produce a relief
of the image.
|
| Binocular
Cues - Detection with 2 eyes |
Retinal disparity –
retinas present an image that
is different on each retina.
Convergence – measuring
the muscle movements –
determine distance of an
object
|
| Monocular
Cue - Detection with 1 eye |
- Relative Clarity
- Texture Gradient
- Relative size
- Relative motion
- Relative brightness
- Linear perspective-
|
| Near
sighted verse far sighted |
Based on the shape of
the eyeball
|
If the
eyeball is too short,
then the person is far
sighted
If the eyeball is too
elongated egg shaped,
then the person is near
|
Ganglia are
responsible for higher level processing
of the integration of the image that one
sees
|
