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Ch. 4 – Sensation & Perception

Ch. 4 – Sensation & Perception. Sensa tion : stimulation of sense organs Perce ption : organization and interpretatio n of senso ry input. Upcoming Schedule. TODAY: Perceptual Processes TOMORROW: Hearing & Taste with Mr. Fox THURSDAY: Jeopardy Game Review FRIDAY: Chapter 4 Quiz

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Ch. 4 – Sensation & Perception

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  1. Ch. 4 – Sensation & Perception • Sensation: stimulation of sense organs • Perception: organization and interpretation of sensory input

  2. Upcoming Schedule • TODAY: Perceptual Processes • TOMORROW: Hearing & Taste with Mr. Fox • THURSDAY: Jeopardy Game Review • FRIDAY: Chapter 4 Quiz • Test on Chapters 1-4 • To Study: review class notes, review chapter notes, ASK QUESTIONS

  3. Iris But First…A ReviewThe Eye • Cornea: where light enters the eye • Lens: focuses the light rays on the retina • Pupil: regulates amount of light • Iris: colored ring of muscle, constricts or dilates via amount of light to regulate pupil size

  4. Theories of Color • Trichromatic Theory • Human eye has three types of receptors and is capable of “color mixing” • Opponent Process Theory • Color perception depends on the receptors that produce antagonistic responses to color pairs

  5. Visual Information Processing • Light hits retina (converted to neural signals by rods & cones) • Signals travel down optic nerve • Pass through thalamus (sensory routing station) • Info delivered to occipital lobe *Info from LEFT visual field processed in RIGHT hemisphere *Info from RIGHT visual field processed in LEFT hemisphere

  6. Perceptual Processing • http://www.youtube.com/watch?v=vJG698U2Mvo • Same visual input can result in radically different perceptions • Reversible figures • Perceptual set • Inattentional blindness

  7. Perceptual Processing • Bottom-Up Processing • Feature analysis • Top-Down Processing • Gestalt psychology • Cambridge study (see next page)

  8. Can you read it? How? The phaonmnealpweor of the hmuan mind. Aoccdrnig to rseearch at CmabrigdeUinervtisy, the ltteers in a wrod can be in amlsot any psosilbeoredr, so lnog as the frist and lsatltteers are in the rghitpclae. In fcat, eryveihtng else can be a total mses, and you can sitllraed it wouthit a porbelm. This is bcuseae the huamnmniddeos not raederveylteter by istlef, but the wrod as a wlohe. To be mroederict, the huamnmnid is csotntlanyassimung. It tkaessamllpeiecs of imfornaotin and fllis in the gaps. Taht’s why you can raedtihssntenece, and thsoesnteneces that cmaeberofe it, and the mnaysntenecestahtwlilflloow as tihscuolmnreaehcs its grpipingcnolcusion. TihsCmabrigdestduy is vreyncie—and eevnbtteer, deson’t it mkae you feel excetpinaollysrmat? Amzanig, huh? And I awlyastghuhotslpeling was ipmorantt!

  9. Perceptual Processing • Figure and ground • Phi phenomenon (TV) • Distal stimuli vs. proximal stimuli

  10. Depth Perception • Binocular depth cues • Retinal disparity • Convergence • Monocular depth cues • Motion parallax

  11. Optical Illusions • Optical Illusions - discrepancy between visual appearance and physical reality • Muller-Lyer illusion - which is longer? Upside-down T illusion

  12. Zollner illusion These lines are parallel.

  13. These lines are parallel, too.

  14. Impossible Figures

  15. Visual System: Perceptual Processes • http://www.youtube.com/watch?v=URLRdcnU6Hk&safety_mode=true&persist_safety_mode=1&safe=active

  16. So what? • Our perception of the world is subjective • Perception can be influenced by expectations and attention • Perceptions are fallible!

  17. Have a Lovely Day

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