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

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Presentation on theme: "PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 2 #2 Pencils."— Presentation transcript:

1 PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 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...

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17 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.

18 Pay Attention: Dropping Rocks and Frog Legs Ahead!

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

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

21 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.

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

23 Background: Basic Detection Paradigm Time 1 Time 2 *

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