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Psychophysics
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Absolute Threshold
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Vocab V

QuestionAnswer
Psychophysics The study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them
Absolute Threshold The minimum stimulation needed to detect a particular stimulus 50 percent of the time
Signal Detection Theory A theory predicting how and when we detect the presence of a faint stimulus amid background stimulation
Subliminal Below one’s absolute threshold for conscious awareness
Difference Threshold The minimum difference between two stimuli required for detection 50 percent of the time
Weber’s Law The principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage
Wavelength The distance from the peak of one light or sound wave to the peak of the next
Hue The dimension of color that is determined by the wavelength of light; what we know as the color names blue, green, etc
Pupil The adjustable opening in the center of the eye through which light enters
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
Lens The transparent structure behind the pupil that changes shape to help focus images on the retina
Accommodation The process by which the eye’s lens changes shape to focus near or far objects on the retina
Retina 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
Acuity The sharpness of vision
Nearsightedness A condition in which nearby objects are seen more clearly than distant objects because distant objects focus in front of the retina
Farsightedness A condition in which faraway objects are seen more clearly than near objects because the image of near objects is focused behind the retina
Rods Retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don’t respond
Cones Receptor cells that are concentrated near the center of the retina and that function in daylight or in will lit conditions
Optic Nerve The nerve that carries neural impulses from the eye to the brain
Blind Spot The point at which the optic nerve leaves the eye, creating a “blind spot” because no receptor cells are located there
Fovea The central focal point in the retina, around which the eye’s cones cluster
Feature Detectors Nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement
Created by: saxplayer2011
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