Glossary of Psychology Test Senses

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Our way of making contact with the outside environment. Eyes, ears, nose, tongue, and skin have sensory receptors.
Visual Capture
the dominance in humans of vision over the other senses. What is felt or heard confirms what we see.
light waves
what we see is reflected light off objects. All other light is absorbed. We only see a small part of the electromagnetic spectrum.
the distance between repeating units of a wave pattern. X-axis, distance. Its symbol is lambda.
wave amplitude
nonnegative scalar measure of a waves magnitude of oscillation. Oscillation: variation.
covers the Iris, Pupil and Anterior chamber. Provides most of the optical power of the eye. Refracts light and helps keep the eye in focus
iris- the colored part of the eye. Controls the amount of light inside the eye. Widens and constricts the size of the pupil. Divides the front and back of the eye.
pupil- light goes through here. Controlled by the iris.
lens- focuses the light. Tiny muscles around the lens move it outwards and inwards.
retina –area where captured light turns into electrical impulses which travel down the Optic Nerve to the brain.
Rods- photoreceptors in the retina. Far more rods than cones, around 120 million. Rods do not provide color sensitivity, provide vision in dim light and have no ability to tell between colors.
cones-provide color sensitivity and responsible for color vision. Around 6-7 million concentrated in the fovea in the macular region
Fovea- middle of the macula. Sharp vision. Where most of the cones are concentrated.
dark adaptation
dark adaptation – the ability of the eye to adjust to various levels of darkness. Use rod cells, photoreceptor cells in the retina, responsible for night vision, 100x more sensitive to a single photon than cones since require less light to function. Use cone cells also.
blind spot
blind spot –the specific region of the retina where the optic nerve and blood vessels pass through to connect to the back of the eye. No rods or cones at this point. The right eye can see the blind spot of the left eye and vice versa. This makes for complete vision.
optic nerve
optic nerve- carries information from the retina to the brain.

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