PSYCO275 Lecture Notes - Lecture 5: Ganglion Cell Layer, Far-Sightedness, Scotopic Vision
4 Apr 2016
School
Department
Course
Professor
03/10/2012
1
PSYCO 275PSYCO 275
Chapter 6Chapter 6
The Visual The Visual
SystemSystem
BIOPSYCHOLOGY 8e
John P.J. Pinel
Copyright © Pearson Education 2011
•No species can see in complete dark
•Some capable of seeing when
there is little light
•Light can be thought of as:
•Particles of energy (photons)
•Waves of electromagnetic
radiation
•Humans see light between 380-760
nanometers
•• WavelengthWavelength –– Perception of colourPerception of colour
•• IntensityIntensity –– Perception of brightnessPerception of brightness
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Anatomy of the EyeAnatomy of the Eye
Pupil dilation/constriction: sensitivity & acuity
(Myopia)(Myopia)
(Hyperopia)(Hyperopia)
•• Making 3D sense from Making 3D sense from
2D retinal image 2D retinal image
•• ConvergenceConvergence
•• Binocular disparityBinocular disparity
•• Cocktail sausage?Cocktail sausage?
•• Monocular cuesMonocular cues
•• Ex., interpositionEx., interposition
Depth PerceptionDepth Perception
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The Retina: Translation of The Retina: Translation of
Light Into Neural SignalsLight Into Neural Signals
•• “Inside“Inside--out”?out”?
•• Vertical pathwayVertical pathway
•• Lateral Lateral
communicationcommunication
•• Synapses & gap Synapses & gap
junctionsjunctions
•• FoveaFovea
–– High acuity area at center of retinaHigh acuity area at center of retina
–– Thinning of ganglion cell layer reduces Thinning of ganglion cell layer reduces
distortion due to cells between pupil & distortion due to cells between pupil &
retinaretina
•• Blind spotBlind spot
•• CompletionCompletion
•• Higher order Higher order
perceptionperception
