Cognition – 2/e Dr. Daniel B. Willingham. Chapter 2: Visual Perception. PowerPoint by Glenn E. Meyer, Trinity University. ©2004 Prentice Hall . What Makes Visual Perception Hard?. Vision is hard as the pattern of light that falls on your retina is consistent with with many different scenes.
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Chapter 2:Visual Perception
PowerPoint by Glenn E. Meyer, Trinity University
©2004 Prentice Hall
For example, is the figure to the left a square or a cube face on? Maybe it is the base of a four sided pyramid?
1) It identifies objects
2) It helps us navigate in the world
Can you see the Necker Cube on the Left as either of the cubes below?
The Mach Card as an Example of Indeterminacy?
Is the gray part a gray surface of a two part object or is a shadow of the white part?
The Ecological Approach
Palmer, et al 1988
Cues in the Environment
What are these from?
Click on them!
Click on the face to go back if you want to!
Dominant approach, it assumes that information provided in environment is impoverished. Cognitive system must do computation to derive the richness of environment.
Emphasizes that the environment has rich sources of information in it and that the computations the visual system needs to perform are probably not that extensive. Two examples are:
There seem to be separate psychological and physiological systems for these two processes
Do you the figure below as two crossed lines ( X ) or as the two angles ( > <) to the right?
Which is easiest to recognize as a cup? The left or right?
Answer: Subjects don’t alter their grip. The “what” system was fooled but the “how” system wasn’t. See a similar result by Proffitt, et al (1995) with hill slopes – Fig. 2.22