PSYCH 111: Introduction to Psychology: Week 8: Chapter 4 Quizzes: States of Consciousness
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Free PSYCH 111: Introduction to Psychology: Week 8: Chapter 4 Quizzes: States of Consciousness Questions
Narcoleptic episodes are often triggered by which of the following?
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Periods of complete relaxation and deep sleep onset
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States of heightened arousal or stress that can suddenly induce sleep attacks
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Lack of REM sleep due to prolonged insomnia and sleep deprivation
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External environmental stimuli such as loud noises during the night
Explanation
Correct Answer:
B. States of heightened arousal or stress that can suddenly induce sleep attacks
Explanation:
Narcoleptic episodes frequently occur during times of strong emotional arousal or stress, such as laughter, anger, or excitement. These situations can trigger sudden sleep attacks and episodes of cataplexy, in which muscle tone is lost and voluntary movement may be temporarily paralyzed. This connection between emotional states and narcoleptic symptoms underscores the neurological disruption in regulating sleep–wake boundaries in individuals with narcolepsy.
Why Other Options Are Wrong:
A. Periods of complete relaxation and deep sleep onset
Relaxation may help sleep onset in general, but narcoleptic episodes are not triggered by calm states; they occur during heightened arousal.
C. Lack of REM sleep due to prolonged insomnia and sleep deprivation
Narcolepsy is not caused by insomnia; it is a neurological disorder independent of sleep loss.
D. External environmental stimuli such as loud noises during the night
Loud noises may disturb sleep, but they do not trigger narcoleptic episodes, which occur during wakefulness.
Non-REM (NREM) sleep is subdivided into how many stages, and how are they distinguished?
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Two stages, based on eye movement and muscle tone
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Three stages, identified by characteristic brain wave patterns
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Four stages, categorized by hormone secretion levels
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Five stages, marked by alternating cycles of dreaming and wakefulness
Explanation
Correct Answer:
B. Three stages, identified by characteristic brain wave patterns
Explanation:
Non-REM (NREM) sleep consists of three stages, each with distinct brain wave activity. Stage 1 involves light sleep with theta waves. Stage 2 introduces sleep spindles and K-complexes, signaling deeper relaxation. Stage 3, also called slow-wave sleep, is dominated by delta waves and is critical for physical restoration and memory consolidation. These stages contrast with REM sleep, which has brain activity similar to wakefulness.
Why Other Options Are Wrong:
A. Two stages, based on eye movement and muscle tone
NREM sleep is not divided into two stages, and classification is based on brain wave activity, not eye or muscle activity.
C. Four stages, categorized by hormone secretion levels
Earlier models included four stages, but current classification recognizes three. Hormone secretion is influenced by sleep but does not define stages.
D. Five stages, marked by alternating cycles of dreaming and wakefulness
Sleep cycles alternate between NREM and REM, but NREM specifically has three stages, not five.
Night terrors are best described as which of the following?
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Intense, frightening dreams that occur during REM sleep and are vividly remembered
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Episodes of panic, screaming, and attempts to escape, usually during deep NREM sleep
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Brief awakenings caused by pauses in breathing during the night
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Mild anxiety dreams that occur in light sleep and are easily recalled
Explanation
Correct Answer:
B. Episodes of panic, screaming, and attempts to escape, usually during deep NREM sleep
Explanation:
Night terrors, also called sleep terrors, are a type of parasomnia that occurs most often in children during deep NREM (Stage 3) sleep. They involve sudden arousals marked by intense fear, screaming, rapid heartbeat, and attempts to flee from perceived danger. Unlike nightmares, which occur in REM sleep and are remembered, night terrors leave little to no memory of the episode. They highlight the differences between REM-related dreaming and NREM arousal disorders.
Why Other Options Are Wrong:
A. Intense, frightening dreams that occur during REM sleep and are vividly remembered
This describes nightmares, not night terrors. Nightmares occur in REM, while terrors occur in NREM.
C. Brief awakenings caused by pauses in breathing during the night
This describes sleep apnea, a breathing-related disorder, not panic episodes during sleep.
D. Mild anxiety dreams that occur in light sleep and are easily recalled
Night terrors are not mild; they are intense, disruptive, and typically not remembered afterward.
A K-complex, often observed in Stage 2 sleep, is best described as which of the following?
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A continuous stream of theta waves that signal deep relaxation
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A very high-amplitude brain wave that may occur in response to environmental stimuli
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A rapid burst of low-amplitude beta waves that mimic wakefulness
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A slow, rhythmic alpha wave pattern associated with drowsy wakefulness
Explanation
Correct Answer:
B. A very high-amplitude brain wave that may occur in response to environmental stimuli
Explanation:
K-complexes are large, high-amplitude waveforms seen during Stage 2 sleep. They can occur spontaneously but often appear as responses to external stimuli, such as sounds or touches. This suggests that K-complexes help the brain monitor the environment while maintaining sleep, serving as a protective mechanism. They may function as a bridge between continued sleep and the potential for arousal, ensuring that the sleeper can respond if necessary.
Why Other Options Are Wrong:
A. A continuous stream of theta waves that signal deep relaxation
Theta waves do dominate Stage 2, but K-complexes are distinct high-amplitude spikes, not continuous theta waves.
C. A rapid burst of low-amplitude beta waves that mimic wakefulness
Beta waves are linked to alert wakefulness, not sleep. K-complexes are the opposite, signaling deepening sleep.
D. A slow, rhythmic alpha wave pattern associated with drowsy wakefulness
Alpha waves are tied to relaxed wakefulness or Stage 1 sleep, not to Stage 2 where K-complexes appear.
The evolutionary perspective suggests that sleep patterns developed primarily as an adaptive response to what factor?
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The body’s need to conserve glucose for daytime activities
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Predatory risks that increase in darkness, promoting survival
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The brain’s need to rehearse daily events during REM sleep
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Seasonal changes in food availability across environments
Explanation
Correct Answer:
B. Predatory risks that increase in darkness, promoting survival
Explanation:
Evolutionary psychology argues that sleep patterns were shaped by natural selection. In early human history, nighttime carried greater risks from predators and environmental dangers. By sleeping during the dark hours, humans reduced their exposure to threats and conserved energy for safer, more productive daytime activities. This adaptive response links the biological function of sleep to survival and reproductive success.
Why Other Options Are Wrong:
A. The body’s need to conserve glucose for daytime activities
Energy conservation is a benefit of sleep, but the evolutionary perspective highlights predator avoidance as the stronger survival factor.
C. The brain’s need to rehearse daily events during REM sleep
REM may help with memory consolidation, but this reflects a cognitive function, not the evolutionary survival basis of sleep patterns.
D. Seasonal changes in food availability across environments
Food availability influences migration and behavior but is not considered the core driver of the evolution of sleep patterns.
Sleep is associated with the secretion and regulation of which of the following hormones?
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Melatonin, follicle-stimulating hormone (FSH), luteinizing hormone (LH), and growth hormone
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Insulin, adrenaline, thyroxine, and glucagon
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Cortisol, aldosterone, epinephrine, and norepinephrine
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Estrogen, progesterone, oxytocin, and prolactin
Explanation
Correct Answer:
A. Melatonin, follicle-stimulating hormone (FSH), luteinizing hormone (LH), and growth hormone
Explanation:
During sleep, the endocrine system becomes highly active, regulating hormone release essential for growth, reproduction, and circadian rhythms. Melatonin from the pineal gland helps regulate the sleep–wake cycle. FSH and LH, secreted by the pituitary gland, play critical roles in reproductive function. Growth hormone secretion peaks during deep sleep, supporting tissue repair and development. This demonstrates the strong connection between sleep and hormonal regulation for overall health and homeostasis.
Why Other Options Are Wrong:
B. Insulin, adrenaline, thyroxine, and glucagon
While important, these hormones are not directly regulated by the sleep cycle in the same way. Insulin and glucagon control blood sugar, adrenaline supports the fight-or-flight response, and thyroxine manages metabolism.
C. Cortisol, aldosterone, epinephrine, and norepinephrine
Cortisol does follow a daily rhythm linked to sleep and wakefulness, but this group as a whole does not represent the primary hormones most associated with sleep regulation.
D. Estrogen, progesterone, oxytocin, and prolactin
These are reproductive and bonding hormones. Although they can be influenced by sleep, they are not the key set most directly regulated during sleep cycles, unlike melatonin, FSH, LH, and growth hormone.
A group of sleep disorders in which unwanted, disruptive motor activity and/or experiences occur during sleep is called what?
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Insomnia
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Parasomnia
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Sleep apnea
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Narcolepsy
Explanation
Correct Answer:
B. Parasomnia
Explanation:
Parasomnias are a category of sleep disorders characterized by abnormal movements, behaviors, emotions, perceptions, or dreams during sleep. Common examples include sleepwalking, night terrors, sleep talking, and REM sleep behavior disorder. These disturbances occur while the brain transitions between different stages of sleep and can be disruptive to both the sleeper and others. Parasomnias highlight the complexity of the brain’s regulation of motor activity during sleep.
Why Other Options Are Wrong:
A. Insomnia
Insomnia involves difficulty falling or staying asleep, not unwanted motor activity.
C. Sleep apnea
Sleep apnea is defined by pauses in breathing during sleep, not disruptive motor activity.
D. Narcolepsy
Narcolepsy is marked by sudden, uncontrollable episodes of sleep during wakefulness, not by disruptive behaviors during sleep.
According to the National Sleep Foundation, how many hours of sleep do newborns typically require each night?
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6–8 hours
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7–9 hours
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10–12 hours
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12–18 hours
Explanation
Correct Answer:
D. 12–18 hours
Explanation:
Newborns require the greatest amount of sleep compared to other age groups, usually between 12 and 18 hours a night. This extended sleep duration is essential for their rapid growth, brain development, and overall health. As people age, their sleep needs steadily decline until adulthood, when 7–9 hours of sleep is considered adequate.
Why Other Options Are Wrong:
A. 6–8 hours
This amount of sleep is too short for newborns and is more typical of adults who may be sleep-deprived.
B. 7–9 hours
This is the recommended amount for adults, not newborns, and would not meet infants’ developmental needs.
C. 10–12 hours
While closer, this still falls short of the range cited by the National Sleep Foundation for newborns.
Sleep is composed of different stages that can be identified by patterns of brain wave activity. Which brain waves dominate when a person is awake?
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Alpha waves
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Beta waves
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Delta waves
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Theta waves
Explanation
Correct Answer:
B. Beta waves
Explanation:
When an individual is awake and alert, brain activity is dominated by beta waves. These are fast, low-amplitude waves associated with active thinking, problem-solving, and engagement with the external environment. Beta activity reflects the brain’s readiness to process information and respond to stimuli. In contrast, sleep involves a progression through distinct stages, each marked by characteristic brain wave patterns, such as alpha, theta, and delta waves.
Why Other Options Are Wrong:
A. Alpha waves
Alpha waves occur during relaxed wakefulness or the transition into sleep, not when a person is actively awake and alert.
C. Delta waves
Delta waves are the hallmark of deep, restorative sleep (slow-wave sleep), not wakefulness.
D. Theta waves
Theta waves are most common in light sleep (Stage 1 and 2), not during active wakefulness.
REM rebound may represent what type of adaptive response in nondepressed individuals?
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A cognitive decline that increases the emotional weight of stressful events
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A protective mechanism that suppresses the emotional impact of aversive experiences
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A disruption of sleep architecture leading to fragmented and shallow sleep
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A permanent shift in circadian rhythm that reduces total sleep duration
Explanation
Correct Answer:
B. A protective mechanism that suppresses the emotional impact of aversive experiences
Explanation:
In nondepressed individuals, REM rebound can serve as an adaptive stress response. By extending REM sleep following stress or deprivation, the brain may reduce the emotional salience of negative or aversive events experienced during wakefulness. This mechanism allows for emotional regulation, stabilizing mood, and preventing overwhelming stress responses. Thus, REM rebound highlights the restorative psychological functions of REM sleep, not only in learning and memory but also in managing emotional health.
Why Other Options Are Wrong:
A. A cognitive decline that increases the emotional weight of stressful events
This contradicts the evidence—REM rebound helps regulate emotion, not amplify negative responses.
C. A disruption of sleep architecture leading to fragmented and shallow sleep
REM rebound enhances REM duration and intensity rather than fragmenting sleep.
D. A permanent shift in circadian rhythm that reduces total sleep duration
REM rebound is temporary and compensatory, not a permanent circadian alteration.
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