Lecture 9 Vision Slides F09

Lecture 9 Vision Slides F09 - Lecture 9 Vision...

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Lecture 9 Vision
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      Sensation and Perception Sensation and Perception     Sensation Sensation :  A passive process that  :  A passive process that  allows physical detection of stimuli;  allows physical detection of stimuli;  requires transfer of energy (e.g. light,  requires transfer of energy (e.g. light,  mechanical force, chemical energy). mechanical force, chemical energy). Perception Perception :  An active process by which  :  An active process by which  we are aware of stimuli; involves  we are aware of stimuli; involves  integration of sensations, including  integration of sensations, including  amplification of some inputs and active  amplification of some inputs and active  suppression of others. suppression of others.
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      Basics of Sensation Basics of Sensation Sensory receptor Sensory receptor :  A specialized neuron  :  A specialized neuron  that detects a particular category of  that detects a particular category of  physical events. physical events. Sensory transduction Sensory transduction : The process by  : The process by  which sensory stimuli are transduced into  which sensory stimuli are transduced into  slow, graded receptor potentials. slow, graded receptor potentials. Receptor potentials Receptor potentials : A slow, graded  : A slow, graded  electrical potential produced by a receptor  electrical potential produced by a receptor  cell in response to a physical stimulus. cell in response to a physical stimulus.
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Vision - Perception of light is determined by: Hue: Determined by wavelength Saturation: Determined by the purity of the light wave Brightness: Determined by the intensity of the electromagnetic radiation
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Anatomy of the Visual System: The Eye Orbits: Bony pockets in the front of the skull Sclera: The white tissue of the eye Conjunctiva: Mucus membranes that line the eyelid and protect the eye
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Anatomy of the Visual System:  Eye  Movements Vergence movements: Cooperative movements of the eyes which ensures that the image of an object falls on identical portions of both retinas. Saccadic movements: Rapid, jerky movements of the eyes used in scanning a visual scene. Pursuit movements: Movement the eyes make to maintain an image of a moving object on the fovea.
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Anatomy of the Visual System: The Eye Cornea: Transparent outer covering of the eye that admits light. Pupil:
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This note was uploaded on 02/26/2011 for the course PSYC 301 taught by Professor Yager during the Spring '10 term at Maryland.

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Lecture 9 Vision Slides F09 - Lecture 9 Vision...

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