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Sensation

Sensation. Myers AP Psychology Chapter 5. Sensation vs. perception. Sensation: the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.

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Sensation

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  1. Sensation Myers AP Psychology Chapter 5

  2. Sensation vs. perception • Sensation: the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. • Perception: the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events. • Bottom-up Processing: analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information. Entry level sensory analysis. • Top-down Processing: information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations.

  3. Psychophysics • The study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them.

  4. Absolute thresholds • The minimum stimulation needed to detect a particular stimulus 50 percent of the time. • Hearing Test: an audiologist would have you detects tones at different pitch/volume. When the tone that you detect 50% of the time and do not detect 50% of the time… your absolute threshold has been reached.

  5. Signal Detection Theory • A theory predicting how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise). • It also assumes there is no single absolute threshold and that detection depends partly on a person’s experience, expectations, motivation, and level of fatigue.

  6. Subliminal Stimulation • Subliminal: below one’s absolute threshold for conscious awareness. • Priming: the activation, often unconsciously, of certain associations, thus predisposing one’s perception, memory, or response.

  7. Subliminal Stimulation Riddle • You’re driving a bus with 12 passengers. At the first stop, 6 passengers get off. At the second stop, 3 passengers get off the bus. At the third stop 2 more get off, but 3 new passengers get on the bus. What color are the bus driver’s eyes?

  8. Difference Threshold • The minimum difference between two stimuli required for detection 50 percent of the time • We experience the difference threshold as a just noticeable difference. • Musicians must detect different sounds to tune.

  9. Weber’s Law • The principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount). • Two lights must differ in intensity by 8% • Two objects must differ in weight by 2% • Two tones must differ in frequency by .3%

  10. Sensory Adaption • Diminished sensitivity as a consequence of constant stimulation. • We ignore stimuli that we are completely used to or expect.

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