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Sensation 147-152

Sensation 147-152. Sensation. The process by which our sensory receptors and nervous system receive stimulus from the environment. Sensory receptors = specialized cells within the eye, ear, skin, etc. Perception.

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Sensation 147-152

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  1. Sensation147-152

  2. Sensation • The process by which our sensory receptors and nervous system receive stimulus from the environment. • Sensory receptors = specialized cells within the eye, ear, skin, etc.

  3. Perception • The process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events.

  4. Bottom Up vs. Top Down Processing • Bottom Up Processing: Flow of sensory data from sensory receptors to the brain

  5. Top Down Processing: drawing meaning from our senses by using knowledge, experience, etc. • The difference between our eyes seeing a face and us recognizing someone we know. PROSOPAGNOSIA – inability to recognize faces (6). • http://www.youtube.com/watch?v=XLGXAiSpN00&list=LPix2Ja8A7F5Q&index=1&feature=plcp

  6. Transduction • Process to convert physical energy to a neural signal

  7. Absolute Threshold • The minimum stimulation needed to detect a stimulus 50% of the time. • Touch minimum = bee’s wings on skin

  8. Signal Detection Theory • Predicts how we detect a stimulus amid other stimuli. • Assumes that we do not have an absolute threshold. • We detect stuff based on our experiences, motivations and fatigue level.

  9. GI Joe will perceive…? Sleeping Baby will perceive…?

  10. Subliminal Stimulation • Below one’s absolute threshold for conscious awareness (3) • http://www.youtube.com/watch?v=73fCLx-mFLg Does this work? Yes and No • Slide studies showed some emotional reactivity (called priming a response). • The effects are subtle and fleeting.

  11. Backmasking (8) http://www.youtube.com/watch?v=UMaA8LK5BZw

  12. Difference Threshold • The minimum difference that a person can detect between two stimuli. • Also known as Just Noticeable Difference

  13. Can you tell the difference?

  14. Weber’s Law • The idea that, to perceive a difference between two stimuli, they must differ by a constant percentage; not a constant amount.

  15. Sensory Adaptation • Diminished sensitivity as a result of constant stimulation.

  16. We do not perceive the world how it really is, but as it is useful for us to perceive it.

  17. Selective Attention • The focusing of conscious awareness on a particular stimulus.

  18. An example of selective attention is: Cocktail Party Effect: ability to listen to one voice among many.

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