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Notes 2-29-08 - Sensing the World Senses make an organism...

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Sensing the World Senses make an organism adapted to its niche. We as human beings are sensitive to sound frequencies that represent the range of the human voice. Absolute threshold - absolute minimum sensory information needed to sense something Weber’s Law difference threshold gets bigger and bigger depending on the original stimuli. Sensing Stimulation and Differences Sensory adaptation : Diminished sensitivity as a consequence of constant stimulation. Put a band aid on your arm and after a while you don’t sense it. Sensing difference in stimulation depends on the starting level of the stimulation. Vision Transduction : in sensation, the formation of stimulus energy (sights, sounds, smells) into neural impulses. Wavelength : What determines our perception of color. Shorter: Violet. Longer: Red. Differenct wavelengths of light result in different perceived colors. Parts of the eye: 1. cornea 2. iris 3. lens: Transparent structure behind the pupil that changes shape to focus images on the retina. 4. retina: the light sensitive inner surface of the eye, containing receptor
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