Chapter 3 Notes: Consciousness (Psychology in Your Life, 4th Edition)
Consciousness: Key Concepts and Big Questions
Big Questions from Chapter 3: What does it mean to be conscious? How sleep affects consciousness? How hypnosis and meditation alter consciousness? How drugs alter consciousness?
What Does It Mean to Be Conscious?
3.1 Compare normal waking state of consciousness with altered states of consciousness
3.2 Explain how changes in brain activity produce changes in consciousness
3.3 Explain how limited attention affects automatic and controlled processes
3.4 Explain how unconscious mental activity affects behavior
Definition of Consciousness
Consciousness is the combination of a person’s subjective experience of the external world and the person’s internal mental activity.
Conscious experiences differ from person to person due to subjectivity.
Objectivity vs Subjectivity (Learning Tip)
Objective: information exists independently of opinion; can be experienced similarly by everyone; example: jalapeño peppers feeling spicy to some and not to others.
Subjective: information is experienced from an individual perspective and is biased by thoughts and feelings; each person has a unique experience.
Levels of Consciousness
Conscious: awareness of external world and inner mental activity.
Unconscious: lack of awareness of external world and inner mental activity.
Contrast levels of consciousness with states of consciousness (below).
States of Consciousness
Normal waking state: clear awareness of external world and inner mental activity.
Altered state: deviates from normal waking state; can be more or less clear, and thoughts may be more or less organized.
Global Workspace Model
Consciousness arises from activity in specific brain regions, not a single “awareness center.”
Processing in various brain areas contributes to conscious experience.
Trauma and Consciousness
Traumatic brain injury (TBI): severe concussions can cause TBI.
Long-term effects of concussions include increased risk of multiple sclerosis in adolescents who experience concussions.
Females are more vulnerable to concussion and have worse outcomes than males.
Coma and Consciousness
Coma: sleep/wake cycles present (eyes may open), but typically do not respond to surroundings.
Minimally conscious state: able to understand language and mental activity but cannot motorically respond.
Unresponsive wakefulness syndrome: coma lasting more than a month.
Brain Studies of Minimally Conscious State
Similar brain regions activated in coma patients and healthy volunteers when visualizing the same activities (e.g., tennis imagery, spatial navigation imagery).
Example study: Adrian M. Owen et al., Science, 2006. Visualizing activities activates comparable networks.
Attention and Consciousness
Attention: focusing mental resources on specific information to become consciously aware of it.
Two-track mind: attention involves automatic processing and controlled processing.
Video reference: Thinking Fast and Slow (conceptual framing for automatic vs. controlled processing).
Distracted Driving
Talking/texting while driving is dangerous; hands-free devices still impair performance.
Intelligent personal assistants (e.g., Siri, Google Assistant) can impair direction and driving performance.
Multitasking
Attention can be divided, but divided attention is limited.
Self-check: many doubt their own multitasking ability.
Inattentional Blindness
Limited attention leads to failure to notice unexpected objects or people when attention is directed elsewhere.
Simons & Levin (1998) demonstrated inattentional blindness; watch for examples in video materials.
Subliminal Perception
Subliminal perception: unconscious processing of information without conscious awareness.
Subliminal inputs can influence information processing but have little or no effect on complex thinking and actions.
Evidence suggests subliminal messages have small effects on purchasing behaviors.
How Does Sleep Affect Consciousness? (Overview of 3.5–3.9)
3.5: Summarize the four stages of sleep.
3.6: Explain relationship between brain activity and dreaming.
3.7: Summarize three reasons people need sleep.
3.8: Summarize strategies for developing better sleep habits.
3.9: Summarize five sleep disorders.
Consciousness Changes During Sleep
Sleep is part of normal life rhythm; circadian rhythms regulate daily biological cycles.
Light changes register in the suprachiasmatic nucleus (SCN) of the hypothalamus, triggering melatonin production.
Bright light reduces melatonin; darkness increases melatonin production.
Note: a Mars-time comic reference illustrates circadian rhythm shifts in nonstandard schedules.
Brain Activity During Sleep (EEG)
Brain regions show significant activity during sleep; the brain does not shut down during sleep.
Stages of Sleep (EEG Signatures)
Stage N1: drift off; theta waves; hypnic jerks possible.
Stage N2: regular breathing; reduced sensitivity to external stimuli; sleep spindles and K-complexes observed on EEG.
Stage N3 (Slow-Wave Sleep): deep sleep; hard to wake; large, regular delta waves on EEG.
Stage R (REM) Sleep: rapid eye movements, dreaming, paralysis of motor systems; EEG shows beta waves (awake/alert mind).
Reference: Sleep Stages video in eBook.
Cycles of Sleep in a Typical Night
Pattern of sleep stages across the night; deep sleep (N3) tends to occur early in the evening.
Dreaming
Dreams are products of consciousness during sleep; images and fantasies may be confused with reality.
Average person spends about years of life dreaming.
REM dreams tend to be bizarre; Non-REM dreams feel more like everyday life.
Further resources: What’s in a Dream? (Scientific American Frontier).
Theories of Dreaming
Sigmund Freud's Theory of Dreams
Manifest content: the visual content remembered in the dream.
Latent content: the hidden meaning behind the manifest content.
Modern consensus: virtually no support for Freud’s idea of hidden conflicts and symbolic meanings.
Activation-Synthesis Theory (Hobson & McCarley, 1977)
Dreams result from the brain attempting to make sense of random brain activity by synthesizing it with stored memories.
Brain imaging shows dream-content-related activity resembles activity when viewing related content.
Three Theories of Sleep (Benefits)
Restorative theory: Sleep allows the body, including the brain, to rest and repair itself.
Circadian rhythm theory: Sleep evolved to protect organisms from harm; danger is greatest in darkness.
Consolidation theory: Waking experiences are consolidated/strengthened during sleep.
Sleep Deprivation and Function
Two–three days of deprivation: little effect on strength, athletic ability, or complex task performance.
Microsleeps: brief naps during wakefulness, dangerous in real-world tasks.
Prolonged deprivation: cognitive performance and hippocampus activity decline.
Sleep deprivation also disrupts hunger signaling, contributing to overeating and weight gain; linked to negative mental health.
Some data: first-semester students using devices at night reported poorer sleep quality; REM deprivation leads to REM rebound at next opportunity, indicating REM/dreaming need.
Developing Better Sleep (Steps)
Establish a routine to set the biological clock.
Avoid alcohol and caffeine in the evening.
Avoid electronic devices late at night.
Exercise regularly.
Train the mind to associate the bed with sleeping.
Relax; get up; let bygones be bygones.
Sleep Disorders
Insomnia: repeated inability to sleep.
Estimated 12%–20% of adults; more common in women and older adults.
CBT is particularly effective; habit changes help.
Related resources: Kahn Academy video on Sleep Disorders.
Sleep Apnea: stops breathing due to throat closure; frequent awakenings at night.
Narcolepsy: excessive daytime sleepiness; can cause sudden loss of muscle tone and collapse.
Animals can have sleep disorders too (e.g., dog with narcolepsy videos).
REM behavior disorder and sleepwalking (somnambulism): REM BD involves acting out dreams; sleepwalking occurs during slow-wave sleep, usually in the first one or two hours of sleep.
For a personal narrative: Mike Birbiglia’s This American Life episode discusses REM behavior disorder.
How Do Hypnosis and Meditation Alter Consciousness?
3.10 Compare two theories explaining hypnosis.
3.11 Summarize what happens to people when they meditate.
Altered States and Hypnosis
Altered consciousness can involve intense meditation, drug-induced hallucinations, or hypnosis.
An altered state occurs when external reality is more or less clear, and thoughts are more or less organized.
Attention to Suggestions may Alter Consciousness in Hypnosis (classroom demonstration video).
Hypnosis: Core Concepts
Posthypnotic suggestions: a hypnotized person may be guided to change memory, perception, or action; used in therapy (weight loss, quitting smoking).
Hypnosis is a form of social interaction; responses are influenced by the situation and expectations.
Theories of Hypnosis
Sociocognitive theory: Hypnotized people are not in an altered state; they behave as expected in the social context.
Dissociation theory: Hypnosis involves an altered state with awareness split from other aspects of consciousness.
Educational resources: Khan Academy video on hypnosis and meditation.
Practical Applications of Hypnosis
Hypnotic analgesia: pain relief through hypnosis; effective for acute and chronic pain and postoperative recovery.
Likely mechanism: changes interpretation of pain and detachment from pain sensations and emotions.
Supports the dissociation theory of hypnosis.
Discussion prompt: Why might this support dissociation theory?
Meditation
Meditation is intense contemplation leading to calmness, described as an altered state of consciousness.
Forms of Meditation
Concentrative meditation
Mindfulness meditation
Transcendental meditation (TM)
Meditation generally improves health outcomes, cognitive processing, and brain function.
How Do Drugs Alter Consciousness?
3.12 Explain how the four classes of psychoactive drugs create altered states of consciousness.
3.13 Summarize factors that lead to substance use disorder.
Psychoactive Drugs and the Brain
Psychoactive drugs alter brain neurochemistry by activating neurotransmitter systems.
Drugs have legitimate medical uses but are often abused outside treatment.
Everyday substances (e.g., caffeine) influence brain activity.
Four Classes of Psychoactive Drugs (Table 3.1)
Stimulants
Examples: Amphetamines, methamphetamine (meth), cocaine, nicotine, caffeine
Psychological effects: Increase behavior and mental activity
Neurotransmitter systems: Dopamine, norepinephrine
Depressants
Examples: Anti-anxiety drugs (benzodiazepines), alcohol
Psychological effects: Decrease behavior and mental activity
Neurotransmitter systems: GABA
Opiates
Examples: Heroin, morphine, codeine
Psychological effects: Reduce pain and bring pleasure
Neurotransmitter systems: Endorphins
Hallucinogens
Examples: LSD, peyote, psilocybin mushrooms, MDMA (also acts as a stimulant), cannabis (also a stimulant or depressant)
Psychological effects: Change perceptions, thoughts, and emotions
Neurotransmitter systems: Serotonin (LSD, peyote, psilocybin), serotonin/dopamine/norepinephrine (MDMA)
Stimulants
Increase nervous system activity (mental and physical processes).
Interfere with reuptake of dopamine; e.g., cocaine prevents dopamine reuptake → increased confidence, alertness, sociability.
Methamphetamine blocks dopamine reuptake and can damage frontal lobes; see video on meth.
Depressants
Decrease nervous system activity; often sedative at higher doses.
Alcohol is the most widely used depressant.
Societal costs: estimated > $100 billion/year in health care, lost productivity, etc.
Korsakoff’s syndrome: memory loss and intellectual deterioration sometimes caused by alcoholism.
Expectancies about alcohol’s effects are learned early; men report binge drinking more than women.
Opiates
Reduce pain; produce pleasurable feelings; include heroin, morphine, codeine.
Large reward value; can cause relaxation and insensitivity to pain and euphoria; used historically for pain relief.
Hallucinogens
Alter sensation and perception; evoke sensory images without sensory input.
Includes MDMA (ecstasy), LSD, psilocybin, peyote, marijuana.
Substance Use Disorder: Physical and Psychological Aspects
Definition: compulsive drug craving and use despite negative consequences.
Tolerance: need to take larger doses to achieve the same effect.
Withdrawal: anxiety, tension, and cravings after stopping drug use.
Development of addiction: dopamine activity in the limbic system underlies reward and reinforcement; addiction is often a vicious cycle (watch related videos for deeper understanding).
Likelihood of addiction: Only about 5 ext{--}10 ext{%} of people who use drugs become addicted; genetic components exist, especially for alcoholism.
Connections to Foundations and Real-World Relevance
Consciousness links to subjective experience and perceived reality; central to psychology’s understanding of perception, attention, memory, and behavior.
Brain-based models (e.g., Global Workspace) connect conscious experience to neural processes, informing neuropsychology and clinical approaches (coma, TBI, vegetative states).
Sleep research connects circadian biology with health outcomes (metabolic, cognitive, mental health) and has implications for work schedules, education, and public safety (e.g., driving).
Dream theories (Freud, Activation-Synthesis) illustrate how science tests competing hypotheses about conscious experiences during sleep.
Hypnosis and meditation illustrate non-pharmacological routes to altering consciousness, with practical implications for pain management, stress reduction, and clinical therapy.
Substance use disorder highlights the neurochemical underpinnings of addiction, societal costs, and the role of genetics and environment in vulnerability.
Quick Reference: Key Numerical/Fact Details
Insomnia prevalence: 12 ext{%} ext{–} 20 ext{%} of adults.
Addiction prevalence among drug users: 5 ext{%} ext{–} 10 ext{%}.
Sleep deprivation effects: two to three days may have little impact on strength or complex tasks; prolonged deprivation impairs cognitive performance and hippocampus activity.
Dreams spent in life: about years dreaming.
Sleep stages: N1 (theta), N2 (spindles and K-complexes), N3 (delta, slow-wave), REM (beta activity, dreaming, motor paralysis).
Circadian biology: SCN in hypothalamus regulates melatonin; light curtails melatonin; darkness raises melatonin.
Freud theory details: manifest vs latent content (largely unsupported by parallel evidence).
Examples and Metaphors from the Text
Inattentional blindness as a practical reminder that attention acts like a spotlight: you can miss obvious things if you’re focusing elsewhere.
The “Mars time” comic illustrates how circadian rhythms adapt (or fail to adapt) to unusual schedules.
Posthypnotic suggestions show how social context and expectations can guide cognitive responses, highlighting the social-psychological aspect of hypnosis.
Summary of Ethical, Philosophical, and Practical Implications
Altered states (hypnosis, meditation, drugs) challenge the boundary between self and environment, raising questions about agency, free will, and responsibility.
Sleep health has broad implications for safety (driving), mental health, and cognitive functioning; policies around work hours, schooling, and public safety can be informed by sleep science.
The diagnosis and care of disorders of consciousness (coma, minimally conscious state, vegetative state) have profound ethical considerations regarding treatment, prognosis, and quality of life.
The medical use of hypnosis and pharmacological agents must balance benefits (pain relief, anxiety reduction) with risks (dependency, placebo effects, misperception of capability).
Notes: All numerical values and periodized stages are presented using LaTeX where appropriate, e.g., 12 ext{%}, 5 ext{%}, years, days, etc., to meet formatting requirements.