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Unformatted text preview: Chapter 5 Sensation and Perception Sense Organs • Sense Organs : organs that receive stimuli (eyes, ears, nose, mouth, skin) • Sensory Receptor Cells: specialized cells in the sense organs that send neural impulses to brain Sensation Vs. Perception • Sensation: info coming into ur brain • Perception: organizing and interpreting the info • Example: your ear receives a stimulus in the form of sound waves, you perceive that your favorite song is on the radio Sensory Limits (thresholds) • Absolute Threshold: the smallest magnitude of a stimulus tht can be detected (weakest detectable) • Difference Threshold: the smallest detectable difference bet 2 stimuli Sensory Limits Continued • Weber’s Law: • The Difference Threshold between two things depends on the strength of the original stimulus (the stronger the original stimulus, the bigger the changes must be in order for them to be noticed, yet changes in weak stimuli are very noticeable) • Sensory Adaptation: the perceived weakening of a sensation cus of prolonged exposure to the stimulus • Example: when you jump into cold water at first you feel freezing, but after a few moments, the water does not feel as cold (sensory receptors are fatigued and do not detect the stimulus as strong as they first did) Vision • Must have light to see • Light is composed of waves that give us: • Hue: wavelength of light gives us color • Brightness: intensity of light • Saturation: complexity of light (pure vs paler colors) Human Visual Spectrum: ROY G. BIV Parts of the Eye • Cornea : protective coating on the surface of eye • Iris : colored part of the eye that regulates the amt of light that enters • Pupil : opening of the iris (blackest part) • Lens : transparent part of eye that focuses light onto the retina • Retina : images fall here, where sensory receptor cells are...
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This note was uploaded on 09/20/2011 for the course PSYCH 120 taught by Professor Lebrenton during the Fall '10 term at Purdue.
- Fall '10