Perception and the Senses. QOTD Samantha Jacob, Eliza Granahan-field, Grant Vanek, Quinlyn Ambrose, Brady Goldsworthy If you had to choose a sense to.

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Sensation and Perception

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Presentation transcript:

Perception and the Senses

QOTD

Samantha Jacob, Eliza Granahan-field, Grant Vanek, Quinlyn Ambrose, Brady Goldsworthy If you had to choose a sense to lose, which would it be? a) vision b) audition (hearing) c) olfaction (smell) d) gustation (taste) e) touch

Hayley Park Do you think that our individual perceptions are influenced by other aspects of our lives such as beliefs, memories, backgrounds, etc.? A) yes B) no C) depends

Ryan Wolsky The textbook mentions football players not feeling injuries until after a game due to anti-nociceptive signals. Have you ever had an experience such as this where you didn't realize the extent of your injury until well after it occurred? A) yes B) No C) Can’t remember due to TBI

Mary Sarkisian If you think about a taste will you trigger your senses and start to taste it? a) yes b) no (next, replace taste -> smell)

Big Questions How many megapixels are our eyes? How awesome are our other senses?  Sensation: the physical sensors Is perception veridical, or just a convenient illusion? Is it a hard problem? How does it work?  Perception: internal encoding of sensory inputs into meaningful patterns  Illusions: reveal the tricks our brain uses..

Basic senses SenseStimulusReceptors

Psychophysics Absolute threshold  Lowest level of stimulus intensity for 50% response Just-noticeable difference (JND)  Difference in stimulus intensity for 50% response

We’ve got a pretty kick- ass set of senses!

How Many Megapixels?? Retina has ~100 mega-rods, only ~5-7 mega-cones Fovea can resolve about 30 cycles-per-degree (requires cone spacing of ~.3 arcmin) = ~300 dpi at 10” (close!) Focal length of human eye is ~22mm, max ISO about 800

Perception: Open Them Doors!

Dali!

How Does it Work? 1. Contrast, contrast, contrast  Light/dark, color, time (adaptation) – just tell me the news! 2. Ass + u + me = visionary!  The brain has to make many assumptions based on “normal” visual inputs  Easy to trick it with improbable coincidences..

Contrast Illusions A = B?? No Way!

Contrast Illusions A = B?? No Way! Way!

Color Contrast

Time Contrast (we have a model of this)

Time Contrast

Ok Go!

Optic Pathway

Retinal Contrast Filtering

V1

Visual Hierarchy: What vs Where 25

26

Hierarchy of Detectors.. 27 Each stage builds set of assumptions based on typical environmental input Shape from shading Depth cues: occlusion, texture, etc

Shape from Shading

Depth Cues

3D!

Is Perception Veridical? Perception is subjective So what does “veridical” mean? Cultural, language effects? Expectation effects?

Enter the Matrix..

The Chair Category