Theory created by Freud that says dreams provide a "psychic safety valve," allowing us to express otherwise unacceptable feelings and desires.
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Information processing theory
Dreams help us sort out the day's events and consolidate our memories, reorganizing and recharging the brain.
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Physiological function theory
Regular brain stimulation from REM sleep may help develop and preserve neural pathways.
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Activation synthesis theory
REM sleep triggers neural activity in the brainstem that evokes random visual memories, which our sleeping brain weaves into stories.
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Cognitive theory
Dream content reflects a dreamer's knowledge
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Lucid dream
A dream during which the dreamer is aware of dreaming and may be able to exert some degree of control over the dream characters, narrative, and environment.
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Insomnia
Habitual sleeplessness; inability to sleep.
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Somnambulism
Sleepwalking.
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Narcolepsy
Sleep disorder in which a person has uncontrollable sleep attacks, often lapsing directly into REM sleep.
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Sleep apnea
A sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings.
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Delayed sleep phase syndrome
Disorder in which a person's sleep is delayed by two or more hours beyond the socially acceptable or conventional bedtime.
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Idiopathic hypersomnia
A neurological disorder which is characterized primarily by excessive daytime sleepiness (EDS).
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Bruxism
The involuntary or habitual grinding of the teeth, typically during sleep.
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Restless legs syndrome
A disorder characterized by an unpleasant tickling or twitching sensation in the leg muscles when sitting or lying down, which is relieved only by moving the legs.
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Caffeine
A central nervous system stimulant which prevents the onset of drowsiness induced by adenosine.
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Hypnosis
A state of consciousness in which a person is relaxed, focused, and highly responsive to suggestion.
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Anton Mesmer
Put his patients into a trance
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Hypnotizability
The degree to which a hypnosis subject is responsive to hypnotic suggestions.
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Divided consciousness theory
Theory that under hypnosis, our consciousness is divided, and one part of the mind is open to hypnotic suggestion while the other part retains an awareness of reality; created by Ernest Hilgard.
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Social influence theory
Theory that under hypnosis, a person is just playing a role.
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Post hypnotic suggestion
Suggestion that is carried out even after the initial hypnosis session.
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Meditation
To engage in mental exercise (as concentration on one's breathing or repetition of a mantra) for the purpose of relaxation, improving health, or reaching a heightened level of spiritual awareness.
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Sleep hygiene
Habits and practices that are conducive to sleeping well on a regular basis, such as keeping the room cool, dark, and free of light, and also following a regular sleep schedule.
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Cataplexy
A medical condition in which strong emotion or laughter causes a person to suffer sudden physical collapse; a symptom of narcolepsy.
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Night terrors
Characterized by high arousal and an appearance of being terrified; occur during stage 3 sleep and are seldom remembered. Most common in children.
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Nightmares
Anxiety
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Sigmund Freud
This psychologist pioneered dream research, in which he examined the manifest and latent content of dreams.
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Hypnotic induction
The process of relaxation prior to experiencing hypnosis.
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Sleep paralysis
The state of being awake but unable to speak or move; sometimes a symptom of narcolepsy.
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Latent content
According to Freud, the hidden meaning of a dream.
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Manifest content
According to Freud, the actual storyline of the dream, or what the dream seems to be about on the surface.
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Consciousness
Awareness of one's own existence, sensations, thoughts, and surroundings.
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Selective attention
The act of focusing on a particular object for a period of time while simultaneously ignoring irrelevant information that is also occurring.
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Subconscious
Consciousness just below our present awareness.
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Unconscious
Information processing of which we are unaware.
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Biological clock
An internal mechanism that controls the physiological activities of an organism that change on a daily, seasonal, yearly, or other regular cycle.
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Entrainment
The synchronization or alignment of the biological clock rhythm to external time cues, such as the natural dark
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Circadian rhythms
Physical, mental and behavioral changes, controlled by biological clocks, that follow a roughly 24
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Hypothalamus
The part of the brain that links the nervous system to the endocrine system (via the pituitary gland) and is responsible for regulating the sleep
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Melatonin
A hormone released by the pineal gland that makes a person feel sleepy.
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Electroencephalograph (EEG)
A machine that detects electrical activity in the brain using small, flat metal discs (electrodes) attached to the scalp.
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Beta waves
The normal electrical activity (waves) of the brain when conscious and alert.
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Alpha waves
The normal electrical activity (waves) of the brain when conscious and RELAXED.
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Delta waves
Electrical activity (waves) of the brain at a frequency of around 1
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Stage 1 NREM
Sleep stage indicated by the presence of alpha and theta waves; a light sleep.
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Hypnic myoclonia
A sudden jerking movement that most people have experienced when falling asleep, often accompanied with a feeling of falling; also called a hypnic jerk.
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Hypnagogic hallucination
Imagined sensations (which seem very real) that occur as one is falling asleep.
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Stage 2 NREM
Stage of sleep indicated by sleep spindles and K
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Sleep spindles
Short bursts of brainwave activity visible on an EEG that occur during stage 2 sleep.
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K - complexes
Large tepee like spikes in brain activity, present during NREM 2.
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Stage 3 NREM
The deepest stage of sleep indicated by slow delta waves; in this stage the growth hormone is released, and sleepwalking and night terrors may also occur.
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REM
Often called paradoxical sleep because the brain is very active (dreams occur), but the person is hard to awaken and appears calm (the body is paralyzed).
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REM rebound
The tendency for REM sleep to increase following sleep deprivation.
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Sleep
Periodic natural loss of consciousness, as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation.
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Dream
A sequence of images, emotions, and thoughts passing through a sleeping person's mind during REM.
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Free running cycles
\
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REM sleep behavior disorder
The paralysis that normally occurs during REM sleep is incomplete or absent, allowing the person to "act out" his or her dreams. Characterized by the acting out of dreams that are vivid, intense, and violent. Associated with Parkinson's Disease.
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Sleep debt
The cumulative effect of not getting enough sleep; can be repaid by tacking on an extra hour or two each night.
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Memory
The persistence of learning over time through the encoding, storage, and retrieval of information.
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Encoding
The process of getting information into the memory system.
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Storage
The process of retaining encoded information over time.
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Retrieval
The process of getting information out of memory storage.
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Sensory memory
The immediate, very brief recording of information from the five senses into the memory system. The "entry point."
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Short
term memory
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Long
term memory
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Working memory
A newer understanding of short
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Automatic processing
Unconscious and unintentional encoding of everyday information.
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Effortful processing
Encoding that requires attention and conscious effort.
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Spacing effect
The tendency for distributed study or practice to yield better long
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Implicit memory
Retaining learned skills or classically conditioned associations, without conscious awareness; also called non
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Explicit memory
Memory of facts and personal events that you can consciously retrieve; also called declarative memory.
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Long
term potentiation
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Flashbulb memory
A clear memory of an emotionally significant moment or event.
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Chunking
Organizing items into familiar, manageable units; often occurs automatically.
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Mnemonics
Memory aids or tricks, especially techniques that use vivid imagery and organizational devices.
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Testing effect
Enhanced memory after retrieving, rather than simply re
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Hippocampus
A neural center located in the limbic system; helps process explicit memories for storage.
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Priming
The activation, often unconsciously, of particular associations in memory.
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Infantile amnesia
Difficulty or inability that adults have remembering early childhood (because the brain is not developed enough to form long
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Information
processing model
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Episodic memory
Memory of personal events in a specific time and place.
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Semantic memory
Memory for general facts and concepts not linked to a specific time.
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Procedural memory
Memory for motor skills and habits, such as texting or riding a bike.
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Classical conditioning
Memory of learned associations.
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Peg
word system
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Method of loci
Mnemonic device that involves taking a mental walk through a familiar location. A person connects specific locations with the items he or she wants to remember. Also called the "memory palace."
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Cerebellum
Part of the brain that plays an important role in forming and storing memories created by classical conditioning.
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Basal ganglia
Part of the brain that helps form memories of physical skills (walking, cooking, dressing, etc.).
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Echoic memory
A form of sensory memory that allows the mind to temporarily perceive and store auditory information or sound.
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Iconic memory
A brief sensory memory of visual stimuli.
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Recall
Memory demonstrated by retrieving information learned earlier, as on a fill
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Retrieval cue
Any stimulus (event, feeling, place, and so on) linked to a specific memory.
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Deja vu
That eerie sense that "I've experienced this before." Cues from the current situation may subconsciously trigger retrieval of an earlier experience.
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Mood
congruent memory
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Memory trace
Physical changes in the brain as a memory forms.
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Proactive interference
The disruptive effect of prior learning on the recall of new information. You forget the new.
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Repression
In psychoanalytic theory, the basic defense mechanism that banishes anxiety
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Misinformation effect
When misleading information is incorporated into one's memory after an event.
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Source amnesia
Faulty memory for how, when, or where information was learned or imagined.
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