Sensation and Perception Quiz
How does raw sensory input become the rich world you experience? This twelve-question quiz covers thresholds, the eye and ear, and the Gestalt rules your brain uses to make sense of it all.
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Sensation is how your sense organs gather information. Perception is how your brain organizes and interprets it. The gap between the two is full of surprises: illusions, blind spots, and the constant guesswork your brain does to build a stable world.
This is a core unit in intro and AP Psychology, and the foundation of fields that study how the brain builds experience, including neuropsychology.
All 12 questions and answers
- The minimum amount of a stimulus you can detect 50% of the time is the... Answer: Absolute threshold
The absolute threshold is the faintest stimulus you can detect half the time, like the quietest sound you can just barely hear.
- The smallest difference you can detect between two stimuli is the... Answer: Just noticeable difference
The just noticeable difference (or difference threshold) is the smallest change you can reliably notice. Weber's law says it scales with the original intensity.
- Converting physical energy like light or sound into neural signals is called... Answer: Transduction
Transduction is the crucial first step where sensory receptors turn physical energy into signals the brain can read.
- The blind spot in your vision exists because... Answer: No receptors sit where the optic nerve exits the eye
Where the optic nerve exits the retina, there are no photoreceptors, creating a small blind spot your brain normally fills in.
- Rods in the retina are mainly responsible for... Answer: Black-and-white vision in low light
Rods handle dim light and peripheral vision but not color. Cones handle color and detail and work best in bright light.
- The trichromatic theory says color vision depends on... Answer: Three types of cones
Trichromatic theory holds that we have three cone types (red, green, blue sensitive) whose combined activity produces all the colors we see.
- Opponent-process theory best explains... Answer: Afterimages and why we never see 'reddish-green'
Opponent-process theory says color is processed in opposing pairs (red-green, blue-yellow, black-white), which explains afterimages.
- Sound is converted into neural signals by hair cells in the... Answer: Cochlea
The cochlea, a coiled structure in the inner ear, contains hair cells that transduce sound vibrations into nerve impulses.
- Grouping nearby items together as a unit is the Gestalt principle of... Answer: Proximity
Proximity is one of the Gestalt grouping principles: objects close together are perceived as belonging to the same group.
- Perceiving a complete shape even when parts are missing is the principle of... Answer: Closure
Closure is our tendency to fill in gaps so we perceive a whole, complete object rather than disconnected pieces.
- Seeing a door as the same rectangle even as it swings open is an example of... Answer: Perceptual constancy
Perceptual constancy lets us see objects as stable in size, shape, and color even as the raw sensory image changes.
- Using prior knowledge and expectations to interpret what you sense is... Answer: Top-down processing
Top-down processing uses context and expectations to interpret sensations, while bottom-up processing builds perception from the raw sensory details.