Distinguishing Reality from Illusion. Visual sensation and perception: A model for the other sensory systems. Common Properties of the Senses. Gather and amplify stimulus energy The distal stimulus (anything outside the body) The proximal stimulus (receptors inside the body) Transduction
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Visual sensation and perception: A model for the other sensory systems
The Eye: A Living Optical Instrumentwhere “Transduction” begins
Figure 4.5, Weiten
Cones are more sensitive here
Rods are more sensitive here
1: rods & cones
3. Optic nerve
4. Optic chiasm
“the whole is different
from the sum of its parts”
Poggendorf Illusion Example
The images are exactly the same except for the thick black area in the right image (an example of the Poggendorf illusion (1860)). In the figure on the right, there appear to be two continuous diagonal lines: a red and a blue line. What occurs in your visual system that could account for the appearance of the continuous diagonal lines?
The Müller-Lyer illusion. Go ahead, measure them: the two vertical lines are of equal length.