PSYCHOLOGY (e2)

Chapter 4: States of Consciousness

What is Consciousness?

  • Consciousness: The state of being aware of one's thoughts, feelings, and surroundings. It encompasses various levels of mental engagement with both internal and external stimuli.

    • Internal stimuli: Sensations that arise from within oneself, including pain, hunger, thirst, and emotions.

    • External stimuli: Influences from the outside world, such as light, warmth, and sound, that affect individual awareness.

States of Consciousness

  • Wakefulness: A state characterized by high sensory awareness, alertness, and the ability to interact with the environment.

  • Sleep: A state of decreased physical activity and sensory awareness, which plays a critical role in multiple biological processes.

  • Altered States of Consciousness: These are modifications in the typical mental activity, which can occur through various means, including daydreaming, meditation, intoxication, and induced states through drugs or hypnosis.

Biological Rhythms

  • Biological Rhythm: An internal cycle that governs various biological processes, impacting everything from hormonal releases to sleep-wake cycles.

  • Circadian Rhythm: A natural, roughly 24-hour cycle that influences physical, mental, and behavioral changes—particularly governing sleep-wake patterns. This rhythm is primarily regulated by the hypothalamus and the pineal gland, which secretes melatonin, aiding in sleep regulation.

What is Sleep?

  • Sleep: A complex state marked by significantly reduced levels of physical activity and awareness, crucial for restoration and recovery of the body and mind. Sleep patterns can vary widely across different species, though humans often place themselves at risk of sleep deprivation due to lifestyle choices.

Sleep Regulation

  • Sleep can be disrupted by various factors, including:

    • Jet Lag: Travel across time zones disrupts circadian rhythms.

    • Sleep Disorders: Conditions such as insomnia or sleep apnea further impact restful sleep.

    • Shift Work: Irregular work hours can disrupt natural sleep patterns and biological rhythms.

How Much Sleep Do We Need?

  • Research indicates that adults generally require between 7-9 hours of sleep each night for optimal functioning and well-being.

Why Do We Sleep?

  • Adaptive Theory: Suggests that sleep serves as a mechanism for restoring and conserving energy, facilitating survival.

  • Restorative Theory: Proposes that sleep is essential for the maintenance of physical and mental health, allowing for cellular repair and memory consolidation.

Stages of Sleep

  1. REM Sleep (Rapid Eye Movement): Characterized by quick movements of the eyes, presence of dreaming, and brainwave patterns similar to those seen during wakefulness.

  2. NREM Sleep: Divided into three stages based on brainwave activity:

    • Stage 1: Light sleep where it's easy to wake, often initial transitions into sleep.

    • Stage 2: Deep relaxation, marked by theta waves and sleep spindles indicating a move into deeper states.

    • Stage 3: Also known as slow-wave sleep, characterized by delta waves, where waking up is much more challenging.

Dreams

Theories of Why We Dream:

  • Wish Fulfillment: A concept proposed by Sigmund Freud; suggests that dreams are a way to fulfill repressed desires.

  • Information Processing: Emphasizes that dreams are a reflection of significant daily events and aid in memory processing.

  • Activation Synthesis: Suggests that dreams are the result of the brain trying to make sense of random neural activities during sleep.

Sleep Disorders

  1. Insomnia: Difficulty in falling or staying asleep, leading to reduced functionality during the day.

  2. Sleep Apnea: A disorder where breathing is interrupted during sleep, often resulting in excessive daytime sleepiness.

  3. Narcolepsy: Characterized by sudden and uncontrollable episodes of REM sleep during the day.

  4. Night Terrors: Extreme episodes of fear or panic that occur during sleep, often without recollection upon waking.

Altered States of Consciousness (Page 5 onwards)

  • Substance Use Disorder: Involves both physiological and psychological dependence on various substances affecting consciousness.

Drugs and Their Effects:

  • Stimulants: Substances that increase heart rate and provide a feeling of pleasure (e.g., caffeine, nicotine).

  • Depressants: Drugs that slow down central nervous system activity (e.g., alcohol, barbiturates).

  • Opiates: Used primarily for pain relief; can lead to addictive behaviors (e.g., heroin, morphine).

  • Hallucinogens: Substances that alter perception and may lead to visual or auditory hallucinations (e.g., LSD, cannabis).

  • Hypnosis: A state of focused attention, heightened suggestibility, and deep relaxation, which can serve therapeutic purposes.

  • Meditation: Practices that enhance present-moment awareness, promote calmness, and aid in stress reduction.


Chapter 8: Memory

What is Memory?

  • Memory: A set of processes used to encode, store, and retrieve information over different periods of time.

  • A memory system:

    • Receives information

    • Organizes and alters that information

    • Retrieves the information

  • Memory is multifaceted; it is not just one thing in one area of the brain.

Three Basic Functions of Memory

  1. Encoding: (Getting info in)

    • Converts sensory information into a usable form for the brain’s storage systems.

  2. Storage: (Keeping info in)

    • Holding onto information over time; involves retention.

  3. Retrieval: (Getting info out)

    • Utilizing stored information and bringing it into awareness.

Encoding Process

  • Information enters our brains through encoding: the input of information into the memory system

  • Process of:

    • Labeling/coding information

    • Organizing it with similar information

    • Connecting new concepts to existing ones

  • Types of Processing:

    • Automatic Processing:

      • Encoding details like time, space, frequency, and word meanings without conscious awareness.

    • Effortful Processing:

      • Involves time and effort to encode details, such as learning new skills.

      • Making information meaningful facilitates encoding.

Types of Encoding

  • Semantic Encoding: encoding of words and their meanings; most effective form of encoding involving deeper processing.

  • Visual Encoding: encoding of images; concrete words are easier to recall than abstract words.

  • Acoustic Encoding: encoding of sounds.

Serial Position Effect

  • The order of information during encoding can affect memory retrieval.

    • More likely to remember the first (primacy effect) and last (recency effect) items on a list.

Study Strategies

  • State-Dependent Learning: Easier retrieval of memories created in similar states of consciousness or mood.

  • Context-Dependent Learning: Easier retrieval when recalling memories in similar contexts or locations.

Memory Storage

  • After encoding, the information needs to be retained in storage:

    • Sensory Memory

    • Short-Term Memory (Working Memory)

    • Long-Term Memory

Atkinson-Shiffrin Model of Memory

  • Information passes through three stages for long-term storage:

    • Sensory memory → short-term/working memory → long-term memory

    • Resembles computer processing.

Sensory Memory

  • Storage of brief sensory events for up to a couple of seconds; first step in processing stimuli.

  • If deemed valuable, it moves into short-term memory.

Short-Term Memory

  • Also known as Working Memory.

  • Temporary storage lasting about 15-30 seconds; involves memory consolidation and rehearsal.

  • Capacity: 5-9 items (George Miller's "magic number" 7 ± 2).

Long-Term Memory

  • Continuous storage of information with no limit.

  • Explicit (Declarative) Memory: memories of facts/events that can be consciously recalled.

    • Two Types:

      • Semantic Memory: knowledge about words/concepts (e.g., facts).

      • Episodic Memory: information about personally experienced events (e.g., your birthday).

  • Implicit (Nondeclarative) Memory: memories not consciously recalled, formed through behaviors and habits.

    • Types include:

      • Procedural: how-to information (e.g., riding a bike).

      • Priming: stimulus response influence.

      • Emotional Conditioning: evoking emotional responses.

Retrieval

  • Obtaining stored information back into awareness.

  • Methods:

    • Recall: accessing information without cues.

    • Recognition: identifying previously learned information.

    • Relearning: learning previously known information again.

The Brain and Memory

  • Amygdala: Involved in emotion-based memories; emotional events enhance encoding.

  • Hippocampus: Associated with explicit/declarative memory and memory consolidation; damage affects new memory processing.

  • Cerebellum: Processes implicit memories; damage affects classical conditioning.

  • Prefrontal Cortex: Involved in semantic task memory; encoding retrieval is linked to different sides of the prefrontal cortex.

Arousal Theory

  • Strong emotional experiences can enhance memory retention; flashbulb memories capture exceptionally clear emotional recollection.

Problems with Memory

  1. Amnesia: loss of long-term memory due to disease or trauma.

    • Two Types:

      • Retrograde Amnesia: loss of memories before trauma.

      • Anterograde Amnesia: inability to form new memories post-trauma.

  2. Memory Construction & Reconstruction: memories can be unintentionally altered upon retrieval.

  3. Forgetting: loss of information from long-term memory.

    • Causes include encoding failure and retrieval failure (e.g., proactive and retroactive interference).

Enhancing Memory

  • Rehearsal: repetition for memory retention.

  • Elaborative Rehearsal: connecting new info to existing knowledge.

  • Chunking: grouping information for easier encoding.

  • Mnemonics: aids to organize information.

  • Distributed Practice: studying over time for better retention.

  • Activation of Retrieval Cues: recreate situations for memory retrieval.

  • Maintaining Health & Sleep: essential for memory function.


Chapter 6: Learning

Non-Learned Behaviors

  • Reflexes: Motor or neural reactions to specific environmental stimuli.

    • Simpler than instincts.

    • Involve specific body parts and systems (e.g., knee-jerk reflex, pupil contraction in bright light).

    • Involve more primitive centers of the central nervous system (e.g., spinal cord, medulla).

  • Instincts: Innate behaviors triggered by a broad range of events (e.g., maturation, seasonal changes).

    • More complex behavioral patterns.

    • Involve movement of the organism as a whole (e.g., sexual activity, migration).

    • Involve higher brain centers.

What is Learning?

  • Learning, unlike reflexes and instincts, involves change and experience.

  • Learning: A relatively permanent change in behavior brought about by experience.

    • The process involves acquiring knowledge and skills through experience.

    • Associative Learning: Occurs when an organism makes connections between stimuli or events that occur together in the environment.

      • Central to classical conditioning, operant conditioning, and observational learning.

Classical Conditioning

  • Ivan Pavlov: Russian physiologist whose studies on dog digestion led to the discovery of classical conditioning.

    • Process by which we learn to associate stimuli and anticipate events.

    • A neutral stimulus paired with a stimulus that produces a reflexive behavior (unconscious process).

    • Organisms exhibit both unconditioned (unlearned) and conditioned (learned) responses.

Pavlov’s Experiment

  • Dogs naturally salivate in response to food (unconditioned response - UR) which is the unconditioned stimulus (US).

  • Before Conditioning:

    • UCS: Elicits reflexive response (food).

    • UCR: Natural reaction to stimulus (salivation).

  • During Conditioning:

    • NS: Stimulus that does not elicit a response (bell).

    • NS and UCS repeatedly paired (Bell → Food → Salivation).

  • After Conditioning:

    • CS: Elicits a response after being paired with UCS (Bell).

    • CR: Behavior caused by CS (Salivation).

Classical Conditioning and Behaviorism

  • John B. Watson: Believed all behavior could be studied as stimulus-response reactions and that classical conditioning principles could condition human emotions.

  • Conducted a study with "Little Albert," who was conditioned to fear neutral stimuli (e.g., rabbit) through associations with loud sounds.

General Processes in Classical Conditioning

  • Acquisition: Initial learning period connecting NS and UCS, requiring short time intervals between pairing.

  • Extinction: Decrease in conditioned response when UCS is no longer presented; gradual disappearance of CS response.

  • Spontaneous Recovery: Return of extinguished conditioned response after a rest period.

  • Stimulus Discrimination: Learning to respond differently to similar stimuli.

  • Stimulus Generalization: Conditioned response to stimuli similar to the CS.

Operant Conditioning

  • B.F. Skinner: Proposed operant conditioning, where organisms learn to associate behavior with consequences.

    • Pleasant consequences increase likelihood of behavior; unpleasant ones decrease it.

    • Behavior motivated by reinforcements and punishments.

OC Terminology

  • Positive: Adding something.

  • Negative: Taking something away.

  • Reinforcement: Increases behavior; Punishment: Decreases behavior.

Reinforcement Types

  • Positive Reinforcement: Behavior followed by a pleasant outcome (e.g., praise or treats).

  • Negative Reinforcement: Removal of an aversive stimulus (e.g., taking away pain).

Continuous Reinforcement: Reinforcement after every behavior; quickest way to teach. Partial Reinforcement: Intermittent reinforcement; can be fixed or variable, interval or ratio.

Problems with Punishment

  • May induce fear or anxiety, promote aggression, or model aversive treatment.

  • Effective punishment should be immediate, consistent, and explained; negative punishment is often preferred.

Shaping

  • Involves reinforcing successive approximations to a target behavior, breaking behaviors down into smaller, manageable steps.

Latent Learning

  • Learning that is not immediately observable, becoming evident when useful.

  • Example: Children learning from parents without demonstrating knowledge until needed (e.g., navigating routes).

Observational Learning

  • Learning by watching others and imitating behavior.

  • Social Learning Theory: Proposed by Albert Bandura, includes attention, retention, reproduction, and motivation.

  • Bobo Doll Study: Children who saw adults rewarded were more likely to imitate aggression towards the Bobo doll.

Observational Learning & Violent Media

  • Research indicates correlations between exposure to violent media and aggression in children, suggesting desensitization to violence with repeated exposure.