Chapter 4 for posting

Chapter 4 for posting - Sensation and Perception •...

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Unformatted text preview: Sensation and Perception • Sensation – The awareness of properties of an object or an event when a sensory receptor is stimulated • Perception – The act of organizing and interpreting sensory input as signaling a particular object or event Illusions • When perception does not accurately represent the world Illusions • When perception does not accurately represent the world Psychophysics The study of the relationship between physical events and the experience of those events • Thresholds – Absolute threshold – Just-noticeable difference (JND) – Weber’s law Psychophysics: Detecting Signals Hit Miss False alarm Correct rejection Yes No Reported signal? S i g n a l ? Yes No • Signal detection theory • Sensitivity • Bias Early Vision • Properties of light – Amplitude – Frequency – Wavelength Structures of the Eye • Pupil • Iris • Lens • Cornea • Retina • Fovea • Optic nerve Rods and Cones • Rods (100-120 million) – Very sensitive to light – Only register shades of gray • Cones (5-6 million) – Sensitive to particular wavelengths – Allow color vision Detecting Light • Properties of light – Amplitude – Frequency – Wavelength Visual Processes...
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This note was uploaded on 02/20/2012 for the course PYSC 101 taught by Professor Baylis during the Fall '08 term at South Carolina.

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Chapter 4 for posting - Sensation and Perception •...

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