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Sensation Perception Essentials
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1
Question
What is the role of the pupil in the eye?
Page 2
Answer
The pupil is a circular opening that adjusts to control the amount of light entering the eye.
2
Question
How does the lens contribute to vision?
Page 2
Answer
The lens is a flexible, transparent structure that changes shape to focus light on the retina.
3
Question
What is the function of the retina in the eye?
Page 2
Answer
The retina is a thin layer of tissue at the back of the eye containing photoreceptor cells that detect light and initiate the visual process.
4
Question
What are rods and cones in the retina?
Page 2
Answer
Rods are photoreceptors sensitive to low light levels for night vision and peripheral vision; cones are photoreceptors sensitive to color and detail in bright light.
5
Question
Describe the process of phototransduction.
Page 2
Answer
Phototransduction is the chemical process where light energy activates photoreceptor cells (rods and cones), converting it into electrical signals sent to the brain via the optic nerve.
6
Question
What is sensation?
Page 5
Answer
Sensation is the process by which our sense organs and nervous system receive and represent stimulus energies from our environment.
7
Question
What is perception?
Page 5
Answer
Perception is the organized processing of sensory information, enabling us to recognize meaningful objects and events.
8
Question
What is bottom-up processing?
Page 5
Answer
Bottom-up processing is sensory analysis that starts at the sensory receptors and works up to the brain's integration of sensory information.
9
Question
What is top-down processing?
Page 5
Answer
Top-down processing is information processing guided by higher-level mental processes, such as expectations and prior knowledge.
10
Question
What is priming?
Page 9
Answer
Priming is the activation of certain associations in memory, which prepares or alters one's perception.
11
Question
What is the absolute threshold?
Page 9
Answer
The absolute threshold is the minimum stimulation needed to detect a particular stimulus 50% of the time.
12
Question
What is the difference threshold?
Page 9
Answer
The difference threshold is the minimum difference between two stimuli required to detect the difference 50% of the time.
13
Question
State Weber's Law.
Page 9
Answer
Weber's Law states that the difference threshold increases in proportion to the size of the stimulus.
14
Question
What is sensory adaptation?
Page 10
Answer
Sensory adaptation is the decreased sensitivity to a constant stimulus over time.
15
Question
How does sensory adaptation affect facial expression recognition?
Page 10
Answer
Sensory adaptation causes the visual system to become less responsive to static facial expressions, making it harder to detect subtle emotional changes.
16
Question
What determines pitch in hearing?
Page 10
Answer
Pitch is determined by the frequency of sound waves, with higher frequencies producing higher pitches.
17
Question
What is the unit for measuring sound intensity?
Page 11
Answer
Sound intensity is measured in decibels (dB).
18
Question
What is frequency in sound?
Page 11
Answer
Frequency is the number of complete wavelengths that pass a point in a given time.
19
Question
Describe the outer ear's role in hearing.
Page 11
Answer
The outer ear (pinna) gathers sound waves and directs them into the ear canal to the eardrum.
20
Question
What happens in the middle ear during hearing?
Page 11
Answer
In the middle ear, the eardrum vibrates from sound waves, and these vibrations are amplified by the ossicles (hammer, anvil, stirrup) before passing to the inner ear.
21
Question
How does the inner ear convert sound to neural signals?
Page 11
Answer
In the inner ear, sound waves cause fluid in the cochlea to vibrate, bending hair cells on the basilar membrane, which triggers electrical signals sent via the auditory nerve.
22
Question
What is sensorineural hearing loss?
Page 12
Answer
Sensorineural hearing loss is caused by damage to the cochlea's hair cells or associated auditory nerves.
23
Question
What causes conduction hearing loss?
Page 13
Answer
Conduction hearing loss is caused by damage to the mechanical system that conducts sound waves to the cochlea.
24
Question
What is neural deafness?
Page 13
Answer
Neural deafness occurs when the auditory nerve or brain fails to convey signals from the cochlea.
25
Question
How is loudness determined in hearing?
Page 13
Answer
Loudness is determined by the number of activated hair cells in the cochlea.
26
Question
What is the place theory of hearing?
Page 13
Answer
The place theory states that we hear different pitches because different areas along the cochlea's basilar membrane respond to different frequencies.
27
Question
Describe the pain circuit.
Page 16
Answer
The pain circuit involves nociceptors (pain receptors) sending signals via the spinal cord to the brain, where they are interpreted as pain.
28
Question
How do biological factors influence pain perception?
Page 16
Answer
Biological factors, such as the brain's interpretation of signals from nociceptors, determine pain perception.
29
Question
What influences pain perception beyond biology?
Page 16
Answer
Pain perception is influenced by learning, psychological factors, and social interactions.
30
Question
What is color constancy?
Page 18
Answer
Color constancy is the tendency to perceive familiar objects as having consistent color, even under changing illumination.