Sensation and Perception Flashcards
The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
Sensation
The process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events.
Perception
Analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information.
Bottom-up processing
Information processing guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations.
Top-down processing
The focusing of conscious awareness on a particular stimulus.
Selective attention
Failing to see visible objects when our attention is directed elsewhere.
Inattentional blindness
Failing to notice changes in our environment.
Change blindness
Conversion of one form of energy into another. In sensation, the transforming of stimulus energies, such as sights, sounds, and smell into neural impulses our brain can interpret.
Transduction
The study of relationships between the physical characteristics of stimuli, such as their intensity and our psychological experience of them.
Psycho-physics
The minimum stimulation needed to detect a particular stimulus 50% of the time.
Absolute threshold
A theory predicting how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise).
Signal Detection Theory
Below one’s absolute threshold for conscious awareness.
Subliminal
The activation, often unconsciously, of certain associations, thus predisposing one’s perception, memory, or response.
Priming
The distance from the peak of one light or sound wave to the peak of the next.
Wavelength
The dimension of color that is determined by the wavelength of light; what we know as the color names blue, green, and so forth.
Hue
The amount of energy in a light our sound wave, which we perceive as brightness or loudness, as determined by the wave’s amplitude.
Intensity
The adjustable opening in the center of the eye through which light enters.
Pupil
A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening.
Iris
The transparent structure behind the pupil that changes shape to help focus images on the retina.
Lens
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.
Retina
The process by which the eye’s lens changes shape to focus near or far objects on the retina.
Accommodation
Retinal receptors that detect black, white, and grey; necessary for peripheral and twilight vision, when cones don’t respond.
Rods
Retinal receptor cells that are concentrated near the center of the retina and that function in daylight or well-lit conditions.
Cones
The nerve that carries neural impulses from the eye to the brain.
Optic Nerve
The point at which the optic nerve leaves the eye, creating a ______ _____ because no receptor cells are located there.
Blind Spot
The central focal point in the retina, around which the eye’s cones cluster.
Fovea
Nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, movement.
Feature Detectors
The processing of many aspects of a problem simultaneously; the brain’s natural mode of information processing for many functions, including vision.
Parallel Processing
The theory that the retina contains three color receptors-one most sensitive to red, one to green, one to blue-which, when stimulated in combination, can produce the perception of any color.
Young-Helmholtz trichromatic (three-color) theory
The theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision.
Opponent-process theory
Any organized whole. ______ psychologists emphasized our tendency to integrate pieces of information into meaningful wholes.
Gesalt
The organization of the visual field into objects (the figures) that stand out from their surroundings.
Figure-ground
The perceptual tendency to organize stimuli into coherent groups, used to make sense of the chaos that the world is.
Grouping