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38 Cards in this Set
- Front
- Back
sensation
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simple awareness due to the stimulation of a sense organ
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perception
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the organization, identification, and interpretation
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transduction
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the conversion, by sensors in the body, of physical signals from the environment into neural signals sent to the central nervous system
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psychophysics
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methods that measure the strength of a stimulus and the observer's sensitivity to that stimulus
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absolute threshold
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the minimal intensity needed to just barely detect a stimulus
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just noticable difference
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the minimal change in a stimulus that can just barely be detected.
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webers law
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the just noticable difference of a stimulus is a constant proportion despite variations in intensity
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signal detection theroy
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the responce to a stimulus depends both on a person's sensitivity to the stimulus in the presence of noise and on a person's response criterion.
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sensory adaptation
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sensitivity to prolonged stimulation tends to decline over time as an organism adapts to current conditions
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visual acuity
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the ability to see fine detail; it is the smallest line of letters that a typical person can read from a distance of 20 feet
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retina
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light sensitive tissue lining the back of the eyeball.
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cones
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detect color, operate under normal daylight conditions, and allow us to focus on fine detail.
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rods
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become active only under low-light conditions for night vision
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fovea
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an area of the retina where vision is the clearest and there are no rods at all
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blind spot
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contains neither rods nor cones and therefore has no mechanism to sense light.
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receptive field
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the region of the sensory surface that, when stimulated, causes a change in the firing rate of that neuron.
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area V1
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the part of the occipital lobe that contains the primary visual cortex.
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perceptual constancy
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even as aspects of sensory signals change, perception remains consistent.
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monocular depth cues
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aspects of a scene that yield information about depth when viewed with only one eye.
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binocular disparity
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the difference in the retinal images of the two eyes that provides information about depth
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apparent motion
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the perception of movement as a result of alternating signals appearing in rapid succession different locations.
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pitch
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how high or low a sound is
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loudness
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a sound's intensity
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timbre
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a listener's experience of sound quality or resonance
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cochlea
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a fluid-filled tube that is the organ of auditory transduction
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basilar membrane
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a structure in the inner ear that undulates when vibrations from the ossicles reach the cochlear fluid.
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hair cells
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specialized auditory recptor neurons embedded in the basilar membrane.
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area A1
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a portion of the temporal lobe that contains the primary auditory cortex.
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place code
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the cochlea encodes different frequencies at different locations along the basilar membrane
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temporal code
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the cochlea registers low frequencies via the firing rate of action potentials entering the auditory nerve
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haptic perception
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the active exploration of the environment by touching and grasping objects with our hands.
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referred pain
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the feeling of pain when sensory information from the internal and external areasconverge on the same nerve cells in the spinal cord.
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gate-control theory
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a theory of pain perception based on the idea that signals arriving from pain receptors in the body can be stopped, or gated, by interneurons in the spinal cord via feedback from two directions.
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vestibular system
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the three fluid-filled semicircular canals and adjacent organs located next to the cochlea in each inner ear.
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olfactory receptor neurons
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receptor cells that initiate the sense of smell.
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olfactory bulb
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a brain structure located above the nasal cavity beneath the frontal lobes.
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pheromones
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biochemical odorants emitted by other members of their species that can affect an animal's behavior or physiology.
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taste buds
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the organ of taste transduction.
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