Perception.pdf - Perception 12:44 PM Sensation vs...

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Sensation vs Perception Sensation is the process by which sensory receptors transduce physical stimulation in the environment into neural impulses Perception is the process by which sensory input is interpreted to form a meaningful subjective percept Basic Physiology of Visual Perception Light enters the cornea 1. Passes into the iris and travels through the lens 2. Hits the fovea 3. Retina reflects it 4. Optic nerve sends the signal 5. Stimuli on left side are projected to right side of brain, vice versa Contralateral organization Early studies on brain laterality looked at processing differences between left and right hemispheres by presenting stimuli either in right or left visual fields Although primary visual cortex receives bulk of visual input, subcortical pathways in the thalamus also receive input Psychophysics The Fechner Law states that an increase in stimulus intensity needed to perceive a change in intensity is proportional to original stimulus intensity The study of how our subjective percept is related to the physical properties of environmental stimuli Basic Elements of Vision Example of black and white bars, high contrast means white and black has a hard edge to distinguish between, medium contrast has a soft edge, low contrast is near blurred together Contrast is the difference in luminance between adjacent elements of a scene Example of viewing a face in different directions, in all directions a face is visible, if horizontal only the face is blurred left and right (person shaking head), vertical only heads is very blurred (person nodding head up and down) Orientation refers to direction information contained within an image It is the variation in contrast per unit of space All Spatial Frequency = clear image, Low Spatial Frequency = Blurry Picture, High Spatial Frequency = distinct lines between black and white Spatial Frequency (SF) refers to the amount of detail in an image
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  • Fall '11
  • DANMEEGAN
  • Basic Physiology of Visual Perception, Cognitive Psychology Page

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