An arbitrary symbol system in which the symbols don’t resemble their real-world referent.
abstract code
A way to store information that resembles the physical stimulus being represented.
analog code
Mental imagery for auditory information.
auditory imagery
An effect in which memory is better for concrete words than abstract words.
concreteness effect
A condition experienced by about 1%–3% of the population in which an individual is completely unable to form mental images in the absence of any brain injury.
congenital aphantasia
Subtle cues in experimental tasks or instructions that may bias participants’ behavior.
demand characteristics
A type of analog code that maintains the perceptual and spatial characteristics of physical objects.
depictive representation
A symbolic code used to represent knowledge that is abstract and does not resemble a stimulus in the real world.
descriptive representation
A theory about knowledge representation that proposes knowledge can be stored as an abstract verbal code or an analog imagery-based code.
dual coding theory
A by-product that arises from a process but does not have a causal effect on that process.
epiphenomenon
An effect in which an experimenter may unconsciously communicate to participants their expectations about what they expect the results to be, and in turn, causing the participant to unconsciously behave according to the experimenter’s expectations.
experimenter expectancy effect
A key principle in science in which theories are tested in order to prove they are false, instead of searching for evidence to confirm a hypothesis.
falsification
Artificial neural nets that are put in competition with each other in which one network tries to generate images and the other tries to pick out the artificially generated images from real images. This technique has been very successful in generating novel images.
general adversarial networks
A condition of having extremely vivid mental imagery, often associated with very high autobiographical memory.
hyperphantasia
A theoretical debate among cognitive psychologists about whether images are stored as pictures in our minds or as propositions.
imagery debate
A technique used to treat anxiety and depression in which patients are guided through memories of past negative or traumatic experiences and instructed to imagine their younger selves acting in a way they wish they could have during the event.
imagery rescripting
The experience of mentally creating a perceptual experience in the absence of a physical stimulus.
mental imagery
An experimental technique in which participants are asked to scan their mental images while response time is measured.
mental scanning
A perceptual experience that occurs after exposure to motion in one direction in which a static scene appears to move in the opposite direction of the previously viewed motion.
motion aftereffect
A statistical technique in which computers search for patterns in brain activity that distinguish what information a person is processing. Those patterns can then be used to predict what a person is perceiving or thinking. Often referred to as “mind reading.”
multivoxel pattern analysis.
The ability to mentally process information about the appearance of objects, including information about shape, color, and texture.
object imagery
Mental imagery for odors.
olfactory imagery
A word that resembles the sound of the item it is referring to, for example, “quack” or “boom.”
onomatopoeia
A performance-based objective test of visual imagery in which a participant is asked to mentally unfold a piece of paper with a hole in it to determine where the holes would be located in the unfolded paper.
paper folding test