Processing in Perception

1. Processing in Perception The ups and downs of the subject

2. How is Data Processed? • How does the data we sense from the environment become a percept? • Two main theories - there are more, but we'll settle for these two!

3. What’s This?????

4. Data Driven Processing • Otherwise known as “Bottom –up” processing. • Devised by J J Gibson (1966) • A theory of Direct Perception

5. Data Driven Processing • Gibson believed we perceive through innate cues. • In Visual perception, these cues depended on information from the environment that we are programmed to interpret and thus make sense of experience.

6. Data Driven Processing • Stimulus cues drive perception • These cues are basically the cues we have learned as depth cues. • Revise them?

7. Data Driven Processing • Superimposition or overlap • Height in the field • Relative Size • Linear Perspective • Texture Gradient • And now … we need to know about… • Motion Parallax

8. Data Driven Processing • The Visual Array contains visual cues, e.g. light reflected from objects, graded textures • As we move around the world, these cues change • Changes in visual cues allow us to perceive depth and objects • Video

9. Affordances • How do we know a table is a table, a pillow is a pillow, a sausage is a sausage? • Affordances

10. Back to the Horse • What we sense is a group of black marks • Bottom up processing cannot explain how we perceive the horse and rider

11. Top-down Processing • Otherwise known as “concept-driven processing” • The fox • The hypothesis

14. Output

15. Journey’s end? • link