Comprehensive Study Notes: Sleep, Learning, Memory, Language, and Cognition in Psychology

Sleep and Consciousness

Sleep Paralysis and Cultural Influences

Sleep paralysis is a phenomenon where individuals wake up or transition into/out of REM sleep and experience a feeling of being conscious but unable to move. This state is often accompanied by anxiety, terror, and hallucinations (e.g., intruder, vestibular/motor/chest pressure). Cultural beliefs shape the experience and interpretation of sleep paralysis.

• Key Features: Inability to move, feeling of presence, hallucinations.

• Cultural Examples: 'Old hag' in Newfoundland, 'Kanashibari' in Japan, 'Pandafeche' in Italy.

• Top-down influences: Cultural context affects the content and emotional impact of sleep paralysis.

Consciousness and Sleep

Consciousness refers to our subjective experience of the world, our bodies, and our mental experiences. Sleep is a state of altered consciousness, with distinct stages and physiological changes.

• States of consciousness: Sleep, paralysis, locked-in syndrome, out-of-body, near-death, coma.

• Circadian rhythm: Biological clock that regulates cycles of sleep and wakefulness, typically over 24 hours.

• Suprachiasmatic nucleus (SCN): Brain structure that controls circadian rhythms by responding to light signals from the retina.

Stages of Sleep

Sleep is divided into several stages, each characterized by distinct brain wave patterns and physiological changes.

• Stage 1: Transition from wakefulness, brain waves slow, light sleep.

• Stage 2: Falling asleep, sleep spindles and K-complexes, further slowing of brain waves.

• Stages 3 & 4: Deep sleep, delta waves, crucial for rest and growth.

• REM Sleep: Rapid eye movement, vivid dreams, paradoxical sleep (brain active, body immobile).

Sleep Cycle: Each cycle lasts about 90 minutes, repeating throughout the night.

Functions and Theories of Sleep

• Restoration: Sleep restores energy, consolidates memory, and supports growth.

• Adaptive theory: Sleep evolved to protect from danger during vulnerable periods.

• Memory consolidation: Sleep strengthens learning and memory.

Sleep Deprivation and Disorders

• Effects: Impaired attention, mood changes, hallucinations, increased risk of accidents.

• Case Study: Peter Tripp's 200-hour wakeathon led to slurred speech, hallucinations, and personality changes.

• Insomnia: Difficulty falling or staying asleep.

• Sleep apnea: Breathing interruptions during sleep.

• Narcolepsy: Sudden sleep attacks.

Dreams and Theories

• Activation-synthesis theory: Dreams are the brain's attempt to make sense of random neural activity.

• Motivational/emotional centers: Dreams reflect concerns, emotions, and motivations.

• Lucid dreaming: Awareness and control within dreams.

Psychoactive Drugs and Sleep

Psychoactive drugs alter consciousness and can affect sleep patterns.

• Stimulants: Increase CNS activity (e.g., caffeine, amphetamines).

• Depressants: Decrease CNS activity (e.g., alcohol, barbiturates).

• Hallucinogens: Alter perception and mood (e.g., LSD, marijuana).

Learning

Unlearned Behaviours: Instincts & Reflexes

Reflexes are automatic, involuntary responses to specific stimuli, essential for survival. Instincts are innate drives or tendencies that lead to particular patterns of behaviour.

• Reflexes: Protective, involve primitive CNS parts.

• Instincts: Involve whole organism (e.g., sexual activity, migration).

Early Forms of Learning

• Habituation: Decreased response to repeated stimulus.

• Sensitization: Increased response to repeated stimulus.

• Classical conditioning: Associating an involuntary response with a stimulus.

Classical Conditioning

Classical conditioning involves learning through association, as demonstrated by Ivan Pavlov's research with dogs.

• Neutral Stimulus (NS): Does not elicit a response initially.

• Unconditioned Stimulus (UCS): Naturally triggers a response.

• Unconditioned Response (UCR): Automatic reaction to UCS.

• Conditioned Stimulus (CS): Previously neutral, now triggers response after association.

• Conditioned Response (CR): Learned response to CS.

Processes: Acquisition, extinction, spontaneous recovery, stimulus generalization/discrimination.

Example: Dog salivating when exposed to food (UCS/UCR), then to bell (CS/CR).

Operant Conditioning

Operant conditioning involves learning through consequences (reinforcement or punishment).

• Law of Effect (Thorndike): Behaviours followed by rewards are more likely to recur.

• Reinforcement: Increases behaviour (positive: add desirable, negative: remove undesirable).

• Punishment: Decreases behaviour (positive: add undesirable, negative: remove desirable).

• Schedules of reinforcement: Fixed/variable ratio or interval.

Example: Giving praise for good grades (positive reinforcement), taking away chores for good behaviour (negative reinforcement).

Cognitive Approaches to Learning

• Latent learning: Learning that occurs without immediate reinforcement.

• Observational learning: Learning by watching others (Bandura's Bobo doll experiment).

Memory

Foundations of Memory

Memory is the process by which we encode, store, and retrieve information. It is not static and can change over time.

• Encoding: Initial recording of information.

• Storage: Information held for future use.

• Retrieval: Recovery of stored information.

Three-Stage Model of Memory

• Sensory Memory: Brief storage of sensory events (visual, auditory, etc.).

• Short-Term Memory (STM): Limited capacity, lasts about 30 seconds.

• Long-Term Memory (LTM): Continuous storage, potentially unlimited.

Example: Remembering a phone number briefly (STM), recalling your first day at university (LTM).

Working Memory and Rehearsal

• Working memory: Active, temporary storage for manipulation and rehearsal.

• Rehearsal: Maintenance (repeating) and elaborative (meaningful) rehearsal help consolidate memory.

• Capacity: $7 \pm 2$ items (Miller's magic number).

Long-Term Memory Types

• Declarative (explicit): Facts and events (semantic and episodic).

• Non-declarative (implicit): Skills and procedures (procedural memory).

Serial Position Effect

• Primacy effect: Better recall for items at the beginning of a list.

• Recency effect: Better recall for items at the end of a list.

Forgetting: Encoding and Retrieval Failures

• Encoding failure: Information never entered memory.

• Retrieval failure: Information is stored but cannot be accessed.

• Interference: Proactive (old interferes with new) and retroactive (new interferes with old).

• Decay: Fading of memory over time.

Amnesia

• Anterograde amnesia: Inability to form new memories after trauma.

• Retrograde amnesia: Loss of memories prior to trauma.

Case Study: Clive Wearing, Henry Mollison (HM).

Levels of Processing Theory

• Shallow processing: Physical or sensory aspects.

• Deep processing: Meaning and connections.

Encoding Specificity and Flashbulb Memory

• Encoding specificity: Recall is better when context matches encoding.

• Flashbulb memory: Vivid, detailed memories of emotionally significant events.

Memory Reconstruction, Schemas, and Suggestibility

• Memory is reconstructive: Memories can change over time and be influenced by schemas and scripts.

• Suggestibility: Misinformation effect, false memories, Mandela effect.

Example: Loftus (1997) and Hyman et al. (1997) studies on implanted false memories.

Language

Phonemes and Morphemes

• Phonemes: Smallest units of sound in language (e.g., "b", "a", "t").

• Morphemes: Smallest units of meaning (e.g., "cat", "-ed").

Syntax and Nonverbal Gestures

• Syntax: Rules for constructing sentences.

• Nonverbal gestures: Communication through body language.

Cross-Linguistic Differences

• Examples: Japanese has a single sound category for "L" and "R"; Hawaiian has fewer phonemes than English.

Thinking, Reasoning, and Problem Solving

Algorithms and Heuristics

• Algorithm: Step-by-step procedure that guarantees a solution.

• Heuristic: Mental shortcut or rule of thumb, faster but less accurate.

Common Cognitive Biases

• Availability heuristic: Judging probability by how easily examples come to mind.

• Anchoring heuristic: Relying on initial information to make decisions.

• Framing: How information is presented affects decision-making.

• Hindsight bias: Belief that events were predictable after they occur.

• Confirmation bias: Seeking information that confirms beliefs.

• Belief perseverance: Maintaining beliefs despite contrary evidence.

Maximizing and Satisficing

• Maximizers: Evaluate every option.

• Satisficers: Settle for "good enough".

Real-World Applications

• Eyewitness misidentification: Line-up procedures, wrongful convictions (e.g., Ronald Cotton, Guy Paul Morin).

• Decision-making: Jury decisions, medical diagnoses, consumer choices.

Drug Categories and Effects

Stimulants, Depressants, and Hallucinogens

• Stimulants: Increase alertness and energy (e.g., caffeine, amphetamines).

• Depressants: Reduce CNS activity, induce sleep or relaxation (e.g., alcohol, barbiturates).

• Hallucinogens: Alter perception and mood (e.g., LSD, psilocybin, marijuana).

Tables

Schedules of Reinforcement

Type	Description	Example
Fixed Ratio	Reinforcement after a set number of responses	Buy 10 coffees, get 1 free
Variable Ratio	Reinforcement after a variable number of responses	Slot machine payout
Fixed Interval	Reinforcement after a set period of time	Paycheck every 2 weeks
Variable Interval	Reinforcement after a variable period of time	Checking Facebook for notifications

Types of Memory

Type	Description	Example
Sensory Memory	Brief storage of sensory information	Iconic (visual), echoic (auditory)
Short-Term Memory	Temporary storage, limited capacity	Remembering a phone number
Long-Term Memory	Continuous, potentially unlimited storage	Remembering your first day at university
Declarative Memory	Facts and events	Knowing the capital of France
Non-Declarative Memory	Skills and procedures	Riding a bike

Drug Categories

Category	Examples	Main Effects
Stimulants	Caffeine, amphetamines, cocaine	Increase alertness, energy
Depressants	Alcohol, barbiturates, benzodiazepines	Reduce CNS activity, induce sleep
Hallucinogens	LSD, psilocybin, marijuana	Alter perception, mood

Additional info: Some explanations and examples have been expanded for clarity and completeness, and tables have been inferred and organized for study purposes.