chapter 3 - Sensation and Perception Chapter Review 1. In...

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Sensation and Perception Chapter Review 1. In essence, sensations are what are provided by our sense organs after a physical energy is transduced into nervous energy; perceptions are the higher level selection, organization, and interpretation of these to produce our awareness of objects and the like. 2. Absolute thresholds are used to measure the minimal amount of stimulation necessary for an organism to detect a given stimulus. Difference thresholds are the minimal amount necessary to detect a change in two stimulus intensities. Both measures are defined as the stimulation necessary to detect either a stimulus or a change in stimulus intensity half the time. While this might seem a straightforward task, simply presenting the participant stimuli and asking if they perceive them, in fact the participant's beliefs about the likelihood of a stimulus being present influences whether they respond. For this reason, signal-detection theory was developed. 3. Stimulus thresholds for the different senses are compared, allowing researchers to get a rough idea about which senses are more sensitive relative to others. 4. Light first passes through the cornea, which does the bulk of the job focusing light. After this, light passes through the iris into the lens, which finely focuses the light onto a spot of the retina known as the fovea. Most of the cones, the photoreceptors responsible for color vision, are in the fovea. Outside of the fovea are the rods, the photoreceptors responsible for vision during low levels of illumination. When one is going from high levels of illumination to low, or vice-versa, it takes some time for the eyes to adjust, or adapt, to the change. After being transduced by the photoreceptors, visual information passes through other layers of the retina and out to the optic nerve. From here, it partially decussates (with the nasal portion crossing to the other hemisphere). After the decussation at the optic chiasm, the information passes through the thalamus and to the primary visual cortex in
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This note was uploaded on 04/03/2008 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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chapter 3 - Sensation and Perception Chapter Review 1. In...

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