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Chapter 9

PSYCH 2000 Chapter 9: Chapter 9


Department
Psychology
Course Code
PSYCH 2E03
Professor
Nikol Piskuric
Chapter
9

This preview shows pages 1-3. to view the full 11 pages of the document.

Visual Image Falls on the Rena
- Rena:

o
oCNS
ophotoreceptors
- Photoreceptorsoutermost

o
Structure of Photoreceptors
- Rods: 
o 
o
o!night vision
- Cones: 
o"
o!#
o!day vision
Rena Distribuon of Rods and Cones
-$##
o%&detailed vision
o
-'()*+,- blind spot
Rhodopsin
- Rhodopsin: #./
-.renal,0##-
1opsin = rhodopsin
The Dark Current
1. 2darkcyclic GMP (cGMP)31,
1-
o4open
oDark current 5$31

2. 41#67
3. 8319413141

- At rest, the membrane potenal of a photoreceptor is ~ -40 mV
Phototransducon

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

- Phototransducon:
,-
1. 0,-
2. :#
3. 0##;.
4. ;.#&<=
5. <=$;!;!
6. ;!.
What is the Outcome of Phototransducon?
1. )membrane potenal$;!.+
2. >$receptor potenal+
3. )?neurotransmi7er release+
What Wavelengths of Light do Photopigments Absorb?
- Spectrophotometry:$

o2#

o@,A /B -$

o; absorpon spectrum
-@ 
,.-
->#dim condions,CCspectral sensivity funcon – relave
sensivity (%) vs wavelength- $# 
-'CD$E+
-'C)$+
Absorpon Spectra and Spectral Sensivity for
CONE Photopigments
-F$$

-67
??

-GF#
o8?$#
o%#
Rods and Cones Have Di>erent Light Sensivies

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-:H#

#$#/scotopic light
- When photopigment rods have absorb more light, converts it
into acve photopigment , which has to be regenerated into its
original state before it can absorb another photon of light
-:##I##
#bleaching
oD#
o#
-##

o0#
Dark Adaptaon
- Dark adaptaon experiment 

##J
o#

o#
E$
$
+
o<($#J
+
(#
-'C>$#+K
-'C>$#+L
-'FC>$##+8
$
Neural Processing Beyond the Photoreceptor
- Renal Ganglion Cells (RGCs)
1. 8$E#

2. 8

3. 8$#
o;
- Q: 
- Circles = cell bodies
Types of RGCs
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