PSYCH 111: Introduction to Psychology: Week 8: Chapter 4 Quizzes: States of Consciousness

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.

The Correct Answer is:

b. The daily fluctuation of body temperature

A circadian rhythm is a type of biological rhythm that follows a cycle of approximately 24 hours. The daily fluctuation of body temperature is an example, as it naturally rises and falls at specific times each day. Other examples include the sleep-wake cycle, heart rate, blood pressure, and blood sugar levels, which are synchronized with environmental cues like light and darkness. Circadian rhythms are regulated by the suprachiasmatic nucleus (SCN) in the hypothalamus and play an important role in maintaining homeostasis and influencing consciousness.

Why the other options are incorrect:

a. The menstrual cycle

This is incorrect because the menstrual cycle is an infradian rhythm, lasting about 28 days, not a 24-hour cycle like circadian rhythms.

c. Seasonal changes in mood

This is incorrect because mood changes based on seasons are linked to circannual rhythms, which follow yearly patterns. Circadian rhythms, on the other hand, occur daily.

d. Growth spurts during adolescence

This is incorrect because growth spurts are influenced by developmental and hormonal changes, not a recurring daily cycle. They occur at different stages of life, not every 24 hours like circadian rhythms.

Correct Answer:

A. Obstructive sleep apnea results from blocked airways, while central sleep apnea results from disrupted brain signals controlling breathing

Explanation:

Sleep apnea occurs in two primary forms. Obstructive sleep apnea (OSA) is the most common and happens when the muscles in the throat relax excessively during sleep, causing airway blockage and preventing airflow into the lungs. Central sleep apnea (CSA) occurs when the brain fails to send proper signals to the respiratory muscles, leading to pauses in breathing. Both types fragment sleep, reduce oxygen levels, and contribute to fatigue and cardiovascular risks.

Why Other Options Are Wrong:

B. Obstructive sleep apnea occurs only in REM sleep, while central sleep apnea occurs only in NREM sleep

Neither type is limited to a specific stage of sleep; they can occur throughout the sleep cycle.

C. Obstructive sleep apnea is caused by stress, while central sleep apnea is caused by excess dreaming

Stress or dreaming are not the causes of sleep apnea; the causes are airway obstruction (OSA) and neural signaling failure (CSA).

D. Obstructive sleep apnea involves abnormal motor activity, while central sleep apnea involves pauses in REM cycles

This incorrectly describes parasomnias (motor activity during sleep) and mischaracterizes central sleep apnea, which is defined by disrupted brain–breathing signals, not REM cycles.

Correct Answer:

C. Alan Hobson

Explanation:

Alan Hobson, a neuroscientist, proposed the activation-synthesis theory of dreaming in the 1970s. This theory suggests that dreams are the brain’s attempt to make sense of random neural activity originating in the brainstem during sleep. The cerebral cortex synthesizes this activity into a coherent narrative, which we then experience as a dream. Hobson’s theory shifted the study of dreams from purely psychological interpretations to a biological and neurological perspective.

Why Other Options Are Wrong:

A. Sigmund Freud

Freud focused on manifest and latent dream content tied to unconscious desires, not on neural activation patterns.

B. Carl Jung

Jung emphasized the collective unconscious and archetypes, not the brain-based mechanisms of dreams.

D. William James

James is known for his work on functionalism and the concept of consciousness as a "stream," not dream generation theories.

Correct Answer:

B. Somnambulism

Explanation:

Sleepwalking, or somnambulism, is a type of parasomnia that occurs during deep NREM sleep, usually in Stage 3. It involves complex motor behaviors such as walking, talking, or performing other activities while still asleep. Individuals typically have little or no memory of the event upon waking. Although more common in children, somnambulism can also occur in adults, often triggered by stress, sleep deprivation, or certain medications.

Why Other Options Are Wrong:

A. Narcolepsy

Narcolepsy involves sudden episodes of falling asleep during wakefulness, not walking while asleep.

C. Parasomnia

Parasomnia is the broader category that includes sleepwalking, but the specific term for sleepwalking is somnambulism.

D. Insomnia

Insomnia is difficulty falling or staying asleep, not abnormal motor activity like sleepwalking.

The Correct Answer is:

b. consciousness

Consciousness refers to our overall awareness of both internal states—such as thoughts, emotions, hunger, thirst, pain, and sleepiness—and external stimuli from the surrounding environment. It enables us to process information, make decisions, and interact meaningfully with the world. Consciousness also encompasses various states, including wakefulness, dreaming, meditation, and altered states caused by drugs or other influences, making it central to understanding human experience.

Why the other options are incorrect:

a. introspection

This is incorrect because introspection is the process of examining one’s own thoughts and feelings, but it does not fully represent total awareness of both internal and external stimuli, which is the broader definition of consciousness.

c. perception

This is incorrect because perception involves interpreting and organizing sensory information from the environment but does not include full awareness of internal states like hunger, sleepiness, and emotional experiences.

d. sensation

This is incorrect because sensation refers only to detecting stimuli through the senses, such as touch, taste, vision, or sound. While sensations contribute to consciousness, they do not represent the complete awareness of both internal and external experiences.

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.

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.

Correct Answer:

B. Falling asleep faster and spending proportionally more time in the stages most recently lost (e.g., REM or slow-wave)

Explanation:

Sleep rebound is the body’s homeostatic response to prior sleep loss. After deprivation, sleep pressure (Process S) is elevated, so individuals typically show reduced sleep latency (they fall asleep more quickly) and a targeted recovery of the stages most deprived—often REM rebound after REM restriction and slow-wave rebound after total or deep sleep loss. This adaptive redistribution restores neural and physiological functions tied to those stages, including synaptic downscaling, memory consolidation, emotional regulation, and metabolic recovery. Importantly, sleep rebound reflects short-term recovery rather than a permanent change in sleep need or circadian timing (Process C). Architecture normalizes after debt is repaid.

Why Other Options Are Wrong:

A. A lasting decrease in total sleep need after prior sleep loss

Sleep rebound does not permanently lower sleep requirements. It is a transient compensatory response; once debt is repaid, baseline need returns.

C. A 12-hour circadian phase shift that permanently resets the sleep–wake cycle

Circadian phase is regulated primarily by zeitgebers (light, timing cues). Rebound alters sleep intensity and stage distribution, not permanent circadian timing.

D. Unchanged sleep latency and normal architecture once a chance to sleep occurs

The hallmark of rebound is the opposite: shorter sleep latency and a biased increase in deprived stages (e.g., REM or slow-wave), not an unchanged profile.