9A
Errors of Sight
Errors of Sight
True or False. Visual perception is always a reliable and accurate representation of the world.
False. Visual perception is fallible and prone to error, such as visual illusions and agnosia.
True or False: Biology, purposeful manipulation of the senses, and perceptual set can all lead to errors in gustatory (taste) perception.
True.
True or False: Perceptual distortions, such as synaesthesia, indicate that there is something physically wrong or damaged in an individual's brain.
False. Perceptual distortions like synaesthesia and spatial neglect can occur in otherwise healthy individuals.
What is a "visual illusion"?
A visual illusion is the perception of a visual stimulus that conflicts with how it is in physical reality.
What biological characteristic defines a "supertaster"?
Supertasters have a low threshold for taste sensation, often due to a higher density of papillae (taste buds) on the tongue, making them highly sensitive to flavors.
What is "lexical-gustatory synaesthesia"?
It is a form of synaesthesia where seeing or reading a word triggers a specific taste (e.g., tasting garlic when reading the word "train").
According to the "carpentered world hypothesis," why do people perceive the line with inverted arrowheads in the Müller-Lyer illusion as longer?
We automatically apply two-dimensional lines to real three-dimensional objects in our memory, such as the corners of rooms. The inverted arrowhead represents an inward corner of a room that we perceive as being further away, leading to a misapplication of depth cues.
How does the substance "miraculin" affect taste perception?
Miraculin is known for making sour foods taste sweet.
What is "spatial neglect"?
Spatial neglect is a disorder where individuals fail to perceive or attend to sensory information located within one side of space (usually the left side following damage to the right hemisphere).
What is the primary difference between apperceptive visual agnosia and associative visual agnosia?
In apperceptive agnosia, individuals have difficulty perceiving the form or visual elements of an object. In associative agnosia, there is no difficulty in perception, but individuals cannot link prior experience to the object to identify what they are viewing.
Besides the actual chemicals in food, identify three factors that influence an individual's judgment of flavor.
Perceptual set (expectations), colour intensity, and texture.
What is one proposed neurological explanation for why synaesthesia occurs?
One explanation is that synaesthetes have structurally unique brains with extra connections between different areas, possibly due to undergoing less "synaptic pruning" during development.
Do individuals with visual agnosia typically have malfunctioning eyes or senses?
Individuals with visual agnosia often have perfect vision and normally functioning senses; the error occurs in the brain's processing of that sensory information.
How does hunger affect taste sensitivity according to research?
Research suggests that the hungrier you are, the better food tastes because sensitivity to sweet and salty flavors is heightened during food deprivation.
Why might a patient with spatial neglect only eat food from the right side of their plate?
Because they fail to perceive or attend to the stimuli (the food) located on the left side of their environment.