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Module 05: Sensation
Module on the senses and their basic physical and mental components
16
Psychology
12th Grade
10/23/2010

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Term
Transduction
Definition
refers to the process in which a sense organ changes, or transforms, physical energy into electrical signals that become neural impulses, which may be sent to the brain for processing.
Term
Adaptation
Definition
refers to the decreasing response of the sense organs, the more they are exposed to a continuous level of stimulation.
Term
Sensations
Definition
relatively meaningless bits of information that result when the brain processes electrical signals that come from the sense organs.
Term
Perceptions
Definition
meaningful sensory experiences that result after the brain combines hundreds of sensations.
Term
Visible Spectrum
Definition
one particular segment of electromagnetic energy that we can see because these waves are the right length to stimulate receptors in the eye (picture: http://www.lcse.umn.edu/specs/labs/images/spectrum.gif )
Term
Path of Light Waves (for seeing objects)
Definition
First, eyes gather and focus light waves into a precise area at the back of your eyes. Second, this area absorbs and transforms light waves into impulses, a process known as transduction.
Term
Structures of the Eye
Definition
Cornea, Pupil, Lense, Iris, Retina, Fovea, Optic Nerve (Diagram: http://www.med.upenn.edu/cpob/images/eye_anat.jpg )
Term
Cornea
Definition
the rounded, transparent covering over the front of your eye. As the light waves pass through the cornea, its curved surface bends, or focuses, the waves into a narrower beam.
Term
Pupil
Definition
a round opening at the front of your eye that allows light waves to pass into the eye's interior.
Term
Iris
Definition
a circular muscle that surrounds the pupil and controls the amount of light entering the eye. In dim light, the iris relaxes, allowing more light to enter- the pupil dialates; in bright light, the iris constricts, allowing less light to enter- the pupil constricts. The iris muscle contains the pigment that gives your eye its characteristic color.
Term
Lens
Definition
a transparent, oval structure whose curved surface bends and focuses light waves into an even narrower beam. The lens is attached to muscles that adjust the curve of the lens, which, in turn, adjusts the focusing.
Term
Retina
Definition
located at the very back of the eyeball; a thin film containing cells that are extremely sensitive to light. These light-sensitive cells, called photoreceptors, begin the process of transduction by absorbing light waves.
Term
Nearsightedness
Definition
(myopia) results when the eyeball is too long so that objects are focused at a point in front of the retina. In this case, near objects are clear, but distant ojects are blurry.
Term
Normal Vision
Definition
If your eyeball is shaped so that objects are perfectly focused on the back of your retina, then both near and far objects are clear and sharp (20/20 vision).
Term
Farsightedness
Definition
(presbyopia) occurs when the eyeball is too short so that objects are focused at a point slightly behind the retina. In this case, distant objects are clear, but near objects appear blurry.
Term
LASIK
Definition
eye surgery; corrects nearsightedness; the surface of the eye is folded back and a laser is used to reshape the exposed cornea so that light waves are correctly bent and focused on the retina.
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