Psych Chapter 6.docx

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Department
Psychology
Course
PSY 101
Professor
Professor Hambrick
Semester
Fall

Description
Psych Chapter 6 09/26/2013 Chapter 6: Sensation and Perception Study of how the world out there gets in…how we construct internal representations of the external world. Sensation­refers to the stimulation of the sensory organs by physical energy from the external world,  and the conversion of this energy into neural signals. Transduction­page 218 in book. Perception­refers to our interpretation of what we sense based on experience, expectations, and  surroundings. Sensation and perception are not the same. For example, people who suffer from prosopagnosia cannot  perceive human faces, but they can perceive objects. Sensing the World: Basic Principles Thresholds: Absolute Threshold­the minimum stimulation necessary to detect physical stimulation half the time; that is,  a particular light, sound, pressure, taste, or odor. Psychophysics­study of the relationship between physical characteristics of physical stimuli and our  perceptual experiences of them, and makes use of signal detection to measure absolute thresholds and  other properties of sensation and perception. Stimuli below the absolute threshold are subliminal and we are influenced by subliminal stimulation.  However, effects of subliminal stimulation are fleeting. And there’s no evidence for powerful, enduring  effects on behavior. Vision Wavelength­refers to the distance between one wave peek and the next, and determines hue (color). Intensity­refers to the amplitude of the light wave (its height) and determines brightness. The light enters the eye through the cornea­ the clear coating that protects the eye. The light passes  through the pupil. A small adjustable opening surrounded by the iris­ a colored muscle that gives your eyes  their color and dilates or constricts in response to light intensely through a process called accommodation.  The lens focuses the light on the retina. Retina­the light sensitive inner surface of the eye containing receptor rods and cones in addition to layers of  other neurons the process visual info.  Cones­enable color vision and 
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