Slide 35
Slide 35 text
⽬の⾊に対する特性
Figure 10.12 Color vision. The light
absorption spectra of the four photopig-
ments in the normal human retina.
(Recall that light is defined as electro-
magnetic radiation having wavelengths
between ~400 and 700 nm.) The solid
curves indicate the three kinds of cone
opsins; the dashed curve shows rod
rhodopsin for comparison. Absorbance
is defined as the log value of the inten-
sity of incident light divided by inten-
sity of transmitted light.
such sources are needed to match (nearly) all the perceived colors is strong
100
Short Medium Long
50
0
Wavelength (nm)
400 450 500 550 600 650
Relative spectral absorbance
Rods
hotoreceptor cell to bipolar cell to ganglion cell—is the
ormation flow from photoreceptors to the optic nerve.
ypes of photoreceptors in the retina: rods and cones. Both
er segment composed of membranous disks that contain
otopigment and lies adjacent to the pigment epithelium,
ment that contains the cell nucleus and gives rise to synap-
contact bipolar or horizontal cells (see also Figure 10.8).
ht by the photopigment in the outer segment of the pho-
s a cascade of events that changes the membrane potential
d therefore the amount of neurotransmitter released by the
Vision: The Eye 235
Ganglion
Ganglion
cell
cell
Horizontal
Horizontal
cell
cell
Amacrine
Amacrine
cell
cell
Amacrine
cell
Horizontal
cell
Rod
Rod
Ganglion
cell
Rod Rod
Rod
Rod
Light
Light
Ganglion
cell layer
Distal
Virtical information flow
Virtical information flow
To optic nerve
To optic nerve
Inner
plexiform
layer
Outer
plexiform
layer
Inner
nuclear
layer
Outer
nuclear
layer
Nerve fiber
layer
Photo-
receptor
outer
segments
Pigment
epithelium
Vertical information flow
To optic nerve
Proximal
Lateral
Lateral
information
information
flow
flow
Lateral
information
flow
Bipolar
Bipolar
cell
cell
Bipolar
cell
Cone
Cone
Cone Cone
Cone
Cone
Cone
Cone
Cone
Rod
Rod
Rod
(B)
ure of the retina. (A)
showing overall
nal layers. (B) Dia-
cuitry of the retina.
n—photoreceptor,
glion cell—provides
e for transmitting
o the brain. Hori-
crine cells mediate
n the outer and
rs, respectively. The
r designate relative
enter of the eye
er of the eye; outer,
r, or toward the pig-
(Neuroscience 3rdEd)
⼈間の⽬の網膜には,⾚,緑,
⻘それぞれの⾊に対応したセン
サーがある.
⻘ 緑 ⾚