Sensation and Perception Webquest
Psych 140
Sensation and Perception Web Quest Go to: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/V/Vision.html 1.) Define and explain the following parts: a. iris- A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening. Pigmented and responsible for the eye color.
b. pupil- The adjustable opening in the center of the eye through which light enters. It is under the control of the autonomic nervous system[->0]. In dim light or when danger is felt, the pupil opens wider letting more light into the eye. In bright light the pupil closes down. This not only reduces the amount of light entering the eye but also improves its image-forming ability.
c. retina- The light sensitive inner surface of the eye, containing the receptor rods and cones plus layers of the neurons that begin the processing of visual information. It contains the light receptors, the rods and cones (acts as the “film” of the eye) The retina also has many interneurons that process the signals arising in the rods and cones before passing them back to the brain.
d. Rods—be specific—scroll down- Retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don’t respond. Rods provide special sensitivity to light in peripheral vision.
e. Cones—be specific—scroll down- Retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions. The cones detect fine detail and give rise to color sensations. Cones provide special sensitivity to color in peripheral vision.
f. Lens- The transparent structure behind the pupil that changes shape to help focus images on the retina. It is held in position by zonules extending from an encircling ring of muscle. When this ciliary muscle is relaxed, its diameter increases, the
Sensation and Perception Web Quest Go to: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/V/Vision.html 1.) Define and explain the following parts: a. iris- A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening. Pigmented and responsible for the eye color.
b. pupil- The adjustable opening in the center of the eye through which light enters. It is under the control of the autonomic nervous system[->0]. In dim light or when danger is felt, the pupil opens wider letting more light into the eye. In bright light the pupil closes down. This not only reduces the amount of light entering the eye but also improves its image-forming ability.
c. retina- The light sensitive inner surface of the eye, containing the receptor rods and cones plus layers of the neurons that begin the processing of visual information. It contains the light receptors, the rods and cones (acts as the “film” of the eye) The retina also has many interneurons that process the signals arising in the rods and cones before passing them back to the brain.
d. Rods—be specific—scroll down- Retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don’t respond. Rods provide special sensitivity to light in peripheral vision.
e. Cones—be specific—scroll down- Retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions. The cones detect fine detail and give rise to color sensations. Cones provide special sensitivity to color in peripheral vision.
f. Lens- The transparent structure behind the pupil that changes shape to help focus images on the retina. It is held in position by zonules extending from an encircling ring of muscle. When this ciliary muscle is relaxed, its diameter increases, the