Vocabulary
Absolute threshold
The smallest amount of stimulation needed for detection by a sense.
Agnosia
Loss of the ability to perceive stimuli.
Anosmia
Loss of the ability to smell.
Audition
Ability to process auditory stimuli. Also called hearing.
Auditory canal
Tube running from the outer ear to the middle ear.
Auditory hair cells
Receptors in the cochlea that transduce sound into electrical potentials.
Binocular disparity
Difference is images processed by the left and right eyes.
Binocular vision
Our ability to perceive 3D and depth because of the difference between the images on each of our retinas.
Bottom-up processing
Building up to perceptual experience from individual pieces.
Chemical senses
Our ability to process the environmental stimuli of smell and taste.
Cochlea
Spiral bone structure in the inner ear containing auditory hair cells.
Cones
Photoreceptors of the retina sensitive to color. Located primarily in the fovea.
Dark adaptation
Adjustment of eye to low levels of light.
Differential threshold (or difference threshold)
The smallest difference needed in order to differentiate two stimuli. (See Just Noticeable Difference ( JND))
Dorsal pathway
Pathway of visual processing. The “where” pathway.
Flavor
The combination of smell and taste.
Gustation
Ability to process gustatory stimuli. Also called taste.
Just noticeable difference ( JND)
The smallest difference needed in order to differentiate two stimuli. (see Differential Threshold)
Light adaptation
Adjustment of eye to high levels of light.
Mechanoreceptors
Mechanical sensory receptors in the skin that response to tactile stimulation.
Multimodal perception
The effects that concurrent stimulation in more than one sensory modality has on the perception of events and objects in the world.
Nociception
Our ability to sense pain.
Odorants
Chemicals transduced by olfactory receptors.
Olfaction
Ability to process olfactory stimuli. Also called smell.
Olfactory epithelium
Organ containing olfactory receptors.
Opponent-process theory
Theory proposing color vision as influenced by cells responsive to pairs of colors.
Ossicles
A collection of three small bones in the middle ear that vibrate against the tympanic membrane.
Perception
The psychological process of interpreting sensory information.
Phantom limb
The perception that a missing limb still exists.
Phantom limb pain
Pain in a limb that no longer exists.
Pinna
Outermost portion of the ear.
Primary auditory cortex
Area of the cortex involved in processing auditory stimuli.
Primary somatosensory cortex
Area of the cortex involved in processing somatosensory stimuli.
Primary visual cortex
Area of the cortex involved in processing visual stimuli.
Principle of inverse effectiveness
The finding that, in general, for a multimodal stimulus, if the response to each unimodal component (on its own) is weak, then the opportunity for multisensory enhancement is very large. However, if one component—by itself—is sufficient to evoke a strong response, then the effect on the response gained by simultaneously processing the other components of the stimulus will be relatively small.
Retina
Cell layer in the back of the eye containing photoreceptors.
Rods
Photoreceptors of the retina sensitive to low levels of light. Located around the fovea.
Sensation
The physical processing of environmental stimuli by the sense organs.
Sensory adaptation
Decrease in sensitivity of a receptor to a stimulus after constant stimulation.
Shape theory of olfaction
Theory proposing that odorants of different size and shape correspond to different smells.
Signal detection
Method for studying the ability to correctly identify sensory stimuli.
Somatosensation
Ability to sense touch, pain and temperature.
Somatotopic map
Organization of the primary somatosensory cortex maintaining a representation of the arrangement of the body.
Sound waves
Changes in air pressure. The physical stimulus for audition.
Superadditive effect of multisensory integration
The finding that responses to multimodal stimuli are typically greater than the sum of the independent responses to each unimodal component if it were presented on its own.
Tastants
Chemicals transduced by taste receptor cells.
Taste receptor cells
Receptors that transduce gustatory information.
Top-down processing
Experience influencing the perception of stimuli.
Transduction
The conversion of one form of energy into another.
Trichromatic theory
Theory proposing color vision as influenced by three different cones responding preferentially to red, green and blue.
Tympanic membrane
Thin, stretched membrane in the middle ear that vibrates in response to sound. Also called the eardrum.
Ventral pathway
Pathway of visual processing. The “what” pathway.
Vestibular system
Parts of the inner ear involved in balance.
Weber’s law
States that just noticeable difference is proportional to the magnitude of the initial stimulus.