Receptors cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions. Retinal receptors that detect black, white, and gray necessary for peripheral and twilight vision, when cones don't respond. The condition in which faraway objects are seen more clearly that near objects because the image of near objects is focused behind the retina.
#Perception definition ap psychology plus
The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information.Ī condition in which nearby objects are seen more clearly than distant objects because distant objects focus right in front of the retina. The process by which the eye's lens changes shape to focus near or far objects on the retina.
The transparent structure behind the pupil that changes shape to help focus images on the retina. The adjustable opening in the center of the eye through which light enters.Ī ring of muscle tissue that forms the color portions of the eye around the pupil and controls the size of the pupil opening. The dimension of color that is determine by the wavelength of light what we know as the color names blue, green, and so forth. Electromagnetic wavelengths vary from the short blips of cosmic rays to the long pulses of radio transmission. The distance from the peak of one light or sound wave to the peak of the next. In sensation, the transforming of stimulus energies into neural impulses. The principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage (rather than a constant amount).ĭiminished sensitivity as a consequence of constant stimulation.Ĭonversion of one form of energy into another. We experience the difference threshold as a just noticeable difference (also called just noticeable difference or JND.)ĭetection of stimuli below absolute threshold The minimum difference between two stimuli required for detection 50 percent of the time. what determines a "hit", "miss," "false alarm" or "correct rejection") Assume that there is no single absolute threshold and that focuses more on the processing of briefly stored information. The minimum stimulation needed to detect a particular stimulus 50 percent of the time.Ī theory predicting how and when we detect the presence of a faint stimuli ("signal") amid background stimulation ("noise"). Information processing guided by higher-level mental process, as when we construct perceptions drawing out our experience and expectation. The process of organizing and interpreting sensory information enabling us to recognize meaningful objects and events.Īnalysis that begins with the sense receptors and works up to the brain's integration of sensory information. The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
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