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Lecture 10: Perception and Cognition

Lecture 10: Perception and Cognition. February 26 , 2013 COMP 150-2 Visualization. Admin. Problems with Processing.js Can’t use any Java functions – need to be careful with using Processing API A4 – no need to handle 0’s. Moving office hour this week to 11-12:30 (push back by one hour).

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Lecture 10: Perception and Cognition

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  1. Lecture 10:Perception and Cognition February 26, 2013 COMP 150-2Visualization

  2. Admin • Problems with Processing.js • Can’t use any Java functions – need to be careful with using Processing API • A4 – no need to handle 0’s. • Moving office hour this week to 11-12:30(push back by one hour)

  3. Thoughts on Job / Internship / Grad Apps • Application letter (for grad schools) • What should be in it • Resume / CV • What’s its purpose • How to write one • Good practice of keeping it live • Phone interviews • A website • Multiple rounds • Phone interviews • Non-technical • What do say • General Strategy • Technical • What to prepare • What type of questions? • How to solve problems under pressure • After receiving an offer • What to do? • How to negotiate

  4. Selective Attention • http://www.youtube.com/user/profsimons#p/a/u/1/IGQmdoK_ZfY

  5. Visual Perception • Visual Perception • Pre-attentive processing • Color theory • Etc. • Related to: • Psychophysics: using physics to measure human perception system • How fast must light flicker until we perceive it as constant? • What change in brightness can we perceive • Cognitive Psychology • Understanding how people think, hear, and how those relate to perception

  6. Visual Detail – Levels of Abstractions

  7. Examining the Mona Lisa (left): peripheral vision (center): near peripheral vision (right): central vision Image source: Margaret Livingstone

  8. Cones and Rods Blind spot 100+ million receptors 120 million rods (for light) 6-7 million cones (for red (64%), green (32%), blue (2%))

  9. Color-Sensitive Cones 100+ million receptors (cones and rods) 1 million optic nerves

  10. Our Brain

  11. Read the string

  12. Read the expression

  13. Types of Visual Processing

  14. Bottom Up • The process of successively select and filter information such that • Low level features are removed • Meaningful objects are identified • Gestalt Psychology

  15. Top-Down • Process driven by the need to accomplish some goal • Just-in-time visual querying

  16. Eye-Tracking for Commercial Use

  17. Savant for a Day (New York Times) Use of Transcranial Magnetic Stimulation (images drawn from memory)

  18. Synderet al., 2003 Journal of Integrative Neuroscience

  19. Questions?

  20. Perceptual System

  21. Pathways V1 (visual area 1) responds to color, shape, texture, motion, and stereoscopic depth. V2 (visual area 2) responds to more complex patterns based on V1 V3 (visual area 3) responds to the what/where pathways, details uncertain V4 (visual area 4) responds to pattern processing Fusiform Gyrus responds to object processing Frontal Lobes responds to high-level attention

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