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PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 2 #2 Pencils

PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 2 #2 Pencils. Psychology 150 Introduction to Psychology. Lecture 09 - 09/19/01 Finishing Perception – 2D  3D Attention?. Sample Problem: Depth Perception. Retina is a 2-D surface - How do you perceive depth?

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PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 2 #2 Pencils

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  1. PLEASE COME!Receive 1 Hour Lab Experience CreditHERE, ThursdayBring 2 #2 Pencils

  2. Psychology 150 Introduction to Psychology Lecture 09 - 09/19/01 • Finishing Perception – 2D  3D • Attention?

  3. Sample Problem:Depth Perception • Retina is a 2-D surface - How do you perceive depth? • Two types of cues…

  4. Binocular Cues • Binocular Disparity.

  5. Binocular Cues • Binocular Disparity. • The less the disparity, the greater the distance. • Sufficient for Depth Perception (stereopsis) • Eye Convergence

  6. Monocular Cues to Depth • Motion Parallax

  7. Monocular Cues to Depth • Motion Parallax • Occlusion

  8. Monocular Cues to Depth • Motion Parallax • Occlusion • Relative Image Size

  9. Monocular Cues to Depth • Motion Parallax • Occlusion • Relative Image Size • Texture Gradients & Linear Perspective

  10. Monocular Cues to Depth • Motion Parallax • Occlusion • Relative Image Size • Linear Perspective • Texture Gradients • Position Relative to Horizon

  11. Problem: Perceptual Constancy • Our perception that properties of objects remain constant even when the conditions of stimulation are changed. • Example: Color Constancy • Is color perception solely a function of wavelength?

  12. Top-Down Effect on Early Perceptual Processing • Steven Palmer (1975) • Theory: Even Early Perceptual Processes are dependent upon the current cognitive state of the perceiver...

  13. Palmer’s Experiment • Subjects: Humans • Task: Look at Object 1, and then identify a briefly flashed object (Object 2)

  14. Palmer’s Experiment • Manipulation: Conceptual Relationship between Object 1 and Object 2 (consistent or inconsistent).

  15. Palmer cont... • Measure: Percent Correct Identification • Prediction: Consistent relationship between object 1 and object 2 will increase perceptual identification. • Results...

  16. Summing Up Perception • Goal: Stable representation of reality. • Problem: Need to transduce “incomplete” incoming stimulus energy and “construct” a percept. • Not a one-to-one relationship between stimulus and perception. • Behavioral study can guide neuroscience. • Construction Project = Unconscious Inference.

  17. Pay Attention: Dropping Rocks and Frog Legs Ahead!

  18. &$%#* Brain Again • Nice device and all, but… • Finite! • Distracting Stimuli. • Attention: A mechanism for selection. • Attention is a hypothetical construct.

  19. Dropping Rocks • How do you demonstrate the properties of gravity? • We need a dropping rock for cognition!

  20. Frog Legs • Helmholtz - Does nerve conduction take time? • If nerve conduction takes time…. • Reaction Time: The elapsed time between the onset of a stimulus and the subject’s response.

  21. An example that puzzled me… • Behavior Boy… • takes a cognitive course...

  22. * Time 1 Time 2 Background:Basic Detection Paradigm

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