Process by which the sensory receptors and nervous system receive and represent stimulus energies from our environment
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Perception
Process by which the brain organizes and interprets sensory information, transforming it into meaningful objects and events
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Bottom-up processing
Analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information
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Top-down processing
\-Information processing guided by higher-level mental processes
\-Draws on one’s experiences and expectations
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Basic steps to the Sensory Systems
Receive sensory stimulation
Transform the stimulation into neural impulses
Deliver the neural information to the brain
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Absolute Threshold
Minimum stimulus energy needed to detect a particular stimulus 50 percent of the time
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Subliminal
Below an individual’s absolute threshold for conscious awareness
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Difference Threshold
\-Minimum difference between two stimuli required for detection 50 percent of the time
\-Individuals experience the difference threshold as a just noticeable difference (or jnd).
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Weber’s law
Principle that two stimuli must differ by a constant minimum percentage to be perceived as different
\-Exact percentage differs based on the stimulus.
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priming
Researchers use _______ to activate unconscious associations.
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stimulus
Individuals can evaluate a ________, even when they are not consciously aware of it.
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subliminal sensations
Individuals can be affected by ________ ________
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subliminal sensations
Stimuli that are so weak that people do not consciously notice them
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Sensory Adaptation
\-Reduced sensitivity in response to constant stimulation
\-Helps focus on informative changes in the environment without being distracted by background chatter
\-Influences perceptions of emotions
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Perceptual Set
Mental predisposition to perceive one thing, rather than another
\-Affects what an individual sees, hears, tastes, and feels
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Context, Motivation, and Emotion
* Affect interpretations of a situation * Context creates expectations that influence individual perception. * Motives provide energy to work toward a goal. * Can cause bias in interpreting neural stimuli * Experiences, assumptions, and expectations can shape and color views of reality via top-down processing.
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Wavelengths
___________ visible to the human eye extend from the shorter waves of blue-violet light to the longer waves of red light.
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Wavelength
Distance from the peak of one light wave to the peak of the next
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Hue
Dimension of color that is determined by the wavelength of light
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Intensity
Amount of energy in a light wave
* Influences what individuals perceive as brightness or loudness * Determined by the wave’s amplitude or height
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short wavelength (bluish colors)
high frequency (high-pitched sounds)
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great amplitude
bright colors; loud sounds
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long wavelength (reddish colors)
low frequency (low-pitched sounds)
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small amplitude
dull colors; quiet sounds
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iris
controls the amount of light entering the eye
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lens; pupil
light hits the ____ in the eye after passing through the _____
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Fovea
point of central focus
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retina
light-sensitive inner surface of the eye
contains:
receptor rods and cones
layers of neurons that begin the processing of visual information
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rods
detect black, white, and grey
necessary for peripheral and twilight visions, when cones do not respond
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cones
detect fine detail and give rise to color sensations in daylight and well-lit conditions
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optic nerve
carries neural impulses from the eye to the brain
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blind spot
point where the optic nerve leaves the eye and has no receptor cells
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6 million
how many cones are there
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120 million
how many rods are there
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center
where are the cones located in the retina
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periphery
where are the rods located in the retina
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low
what is light sensitivity like in dim light for the cones
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high
what is light sensitivity in dim light for the rods
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high
what is color sensitivity like for the cones
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low
what is color sensitivity like for the rods
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high
what is detail sensitivity like for the cones
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low
what is detail sensitivity like for the rods
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Young-Helmholtz trichromatic theory
\-The retina contains three different types of color receptors—red, green, and blue.
\-When stimulated in combination, these receptors can produce the perception of any color.
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opponent-process theory
\-Opposing retinal processes enable color vision.
\-Opposing retinal processes include red-green, yellow-blue, and white-black.
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color processing
\-combines the trichromatic theory and the opponent-processing theory and occurs in two stages.
\-The retina’s red, green, and blue cones respond in varying degrees to different color stimuli.
\-The cones’ responses are processed by opponent-process cells.
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Feature Detectors
\-Nerve cells in the brain that respond to specific features of a stimulus
\-Include shape, angles, or movement
\-Pass scene-specific information to other cortical areas, where more complex patterns are interpreted
\-One temporal lobe area by the right ear enables a person to perceive faces.
\-A specialized neural network helps recognize faces from many viewpoints.
0Interaction between feature detectors and supercells provides instant analyses of objects in the world around people.
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Parallel Processing
\-Processing many aspects of a problem or scene at the same time
\-Brain’s natural mode of information processing for many functions, including vision
\-Damage to neural workstations due to a stroke may render a person unable to perceive movement.
\-these psychologists emphasized the human tendency to integrate pieces of information into meaningful wholes.
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perceptual organization
\-The human brain registers information about the world, filters incoming information, and constructs perceptions.
\-Principles in perceptual organization:
\-Form perception
\-Depth perception
\-Perceptual constancy
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figure-ground
Organization of the visual field into objects that stand out from their surroundings
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grouping
The perceptual tendency to organize stimuli into meaningful groups
\-Proximity
\-Continuity
\-Closure
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depth perception
\-Ability to see objects in three dimensions, although images that strike the retina are two-dimensional
\-Allows people to judge distance
\-Partly innate in other animals
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Visual Cliff
\-Devised by Eleanor Gibson and Richard Walk
\-Laboratory device for testing depth perception in infants and young animals
\-Most infants refuse to crawl across the visual cliff.
\-Crawling, no matter when it begins, seems to increase an infant's fear of heights.
\-Miniature cliff with a glass-covered drop-off
\-Helps determine whether crawling infants and newborn animals can perceive depth
\-Even when coaxed, infants refuse to climb onto the glass over the cliff.
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Binocular Cue
Depends on the use of two eyes
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retinal disparity
The calculation of distance by the brain by comparing images from both eyes
\-Used by 3-D film makers
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monocular cue
Cue available to each eye separately
\-Includes relative height, relative size, interposition, relative motion, linear perspective, and light and shadow
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motion perception
\-The human brain computes motion based partly on its assumption that:
\-Shrinking objects are moving away
\-Enlarging objects are approaching
\-Humans are imperfect at motion perception.
\-When large and small objects move at the same speed, the large objects appear to move more slowly.
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perceptual constancy
Perceiving objects as unchanging, even as illumination and retinal images change
\-Objects have consistent color, brightness, shape, and size.
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color constancy
Perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object
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shape constancy
perception that the form of a familiar object is constant, even when retinas receive changing images of them
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size constancy
perception that objects have a constant size, even when one’s distance from them varies
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the moon illusion
\-the moon looks up to 50 percent larger when near the horizon than when high in the sky
\-monocular cues to an object’s distance make the horizon Moon appear farther away
\-if it’s farther away, the brain assumes that it must be larger than the Moon high in the night sky
\-when the distance cues are taken away, the object will immediately shrink
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perceptual interpretation
\-according to Immanuel Kant, human beings have the innate ability to process sensory information
\-John Locke argues that individuals also learn to perceive the world through their experiences
\-learn to link an object’s distance with it’s size
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experience and visual perception
\-research findings
\-the effect of sensory restriction on infant cats, monkeys, and humans suggests that there is a critical period for normal sensory and perceptual development
\-in humans and other animals, sensory restrictions do not cause permanent harm later in life
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perceptual adaptation
\-ability to adjust to changed sensory input
\-includes adjustments to an artificially displaced or even inverted visual field
\-humans constantly adjust to changed sensory input
\-early nurture sculpts what nature has provided
\-experience guides, sustains, and maintains the pathways in the brain that enable perceptions
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audition
sense or act of hearing
\-helps individuals adapt and survive
\-provides information and enables relationships
\-enables individuals to communicate invisibly
\-hearing loss is an invisible disability
\-humans are acutely sensitive to faint sounds and sound differences
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sound waves
\-vary in shape
\-moving molecules of air create waves of compressed and expanded air
\-ears detect these brief air pressure changes
characteristics:
\-amplitude or height
\-determines the perceived loudness of sound waves
\-frequency or length
\-number of complete wavelengths that pass a point in a given time
\-pitch
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pitch
a tone’s experienced highness or lowness that depends on frequency
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decibels
sound is measured in __________.
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process of sound waves
strike eardrum and vibrate→tiny bones in middle ear pick up vibration and transmit them to the cochlea (inner ear)→ripples in cochlea fluid bend hair cells on the surface and trigger impulses in nerve cells→axons from nerve cells transmit signal to auditory cortex
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sensorineural hearing loss
\-caused by damage to the cochlea’s receptor cells or to the auditory nerves
\-called nerve deafness
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conduction hearing loss
\-caused by damage to the mechanical system that conducts sound waves to the cochlea
\-less common form of hearing loss
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skin senses
pressure, warmth, cold, and pain
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pain
\-reflects both bottom-up sensations and top-down sensations
\-biopsychosocial event
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are not
pain signals ______ processed by specialized receptors
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nociceptors
sensory receptors that detect hurtful temperatures, pressure, or chemicals
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experience of pain
depends on inherited genes and physical characteristics
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misinterprets
brain can sometimes _______ its signals and create pain
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more
humans feel ____ pain when others seem to be experiencing pain
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pain control therapies
drugs, surgery, acupuncture, electrical stimulation, massage, exercise, hypnosis, relaxation training, and thought distraction
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endorphins
natural painkiller released by the brain
have a soothing effect that enables pain reduction
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placebos
help dampen the central nervous system’s attention and responses to painful experiences
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placebo and distraction
maximum pain relief can be obtained by
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endorphins and distraction
activate brain pathways that decrease pain and increase tolerance
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hypnosis
\-social interaction where one person suggest to another that certain perceptions, feelings, thoughts, or behaviors will spontaneously occur
\-inhibits pain-related brain activity
\-explained by the social influence theory and the dissociation theory
\-does not block the sensory input itself, but it may block individual’s attention to those stimuli
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dissociation
divided consciousness
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sweet
energy source
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salty
sodium essential to physiological processes
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sour
potentially toxic acid
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bitter
potential poisons
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umami
proteins to grow and repair tissue
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taste
(sweet, sour, salty, bitter, and umami)
\-gives pleasure and helps people survive
\-can be influenced by learning and expectations
\-number of taste buds and taste sensitivity decrease with age
\-smoking and alcohol can speed up the loss of taste buds
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200 or more taste buds
each bump on the top and sides of the tongue contains ___ __ ____ _____ ____
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50-100 taste receptor cells
each taste bud contains a pore with __-___ _____ ________ _____
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food molecules
each receptor reacts to different types of ____ _________ and sends messages to the brain
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smell
\-enabled by millions of olfactory receptors that respond selectively to odors
\-bypass the thalamus and directly alert the brain
\-odor molecules exist in many shapes and sizes
\-smell’s appeal, or the lack of it, depends partly on learned associations
\-odors can evoke strong feelings, memories, and behaviors
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20 million
humans have some __ _______ olfactory receptors
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frontal; temporal
information from the taste buds travels to an area between the ______ and ________ lobes of the brain
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Kinesthesia
system for sensing the position and movement of individual body parts