Psychology Dream + Brain Structures

Consciousness

Our subjective awareness of ourselves and our environment.

Cognitive neuroscience

The interdisciplinary study of brain activity linked with mental processes such as perception, thinking, memory, and language.

Parallel processing

Processing multiple aspects of a stimulus or problem simultaneously.

Sequential processing

Processing one aspect of a stimulus or problem at a time, typically used for novel information or complex tasks.

Agnosia

A rare neurological disorder where an individual is unable to recognize and identify objects, persons, or sounds despite normally functioning sensory organs.

Suprachiasmatic nucleus (SCN)

A cluster of cells in the hypothalamus that governs circadian rhythms and regulates melatonin secretion.

Circadian rhythm

The internal biological clock that regulates bodily rhythms, including body temperature and wakefulness, on a roughly 24-hour cycle.

Unihemispheric sleep

An evolutionary adaptation in which one cerebral hemisphere sleeps while the other remains alert, observed in aquatic mammals and birds.

N1 sleep

A brief transitional stage between wakefulness and sleep characterized by theta waves, rolling eye movements, and potential hypnagogic sensations.

N2 sleep

The baseline stage of sleep accounting for $45\%$ to $60\%$ of total sleep, characterized by sleep spindles.

N3 sleep

The deepest and most physically restorative stage of sleep, dominated by high-amplitude, slow delta waves.

REM sleep

A paradoxical stage of sleep marked by rapid eye movements, high brain activity, vivid dreaming, and motor paralysis.

Manifest content

In Freudian psychoanalysis, the remembered, surface storyline of a dream that represents a censored, symbolic version of unconscious drives.

Latent content

In Freudian psychoanalysis, the underlying, hidden unconscious drives and wishes that represent the true meaning of a dream.

Information-processing theory of dreaming

The theory that dreaming helps sift, sort, and consolidate daily experiences into long-term memory.

Activation-synthesis theory

The hypothesis proposed by Hobson stating that dreams are the cerebral cortex's attempt to synthesize random neural bursts from the brainstem into a narrative.

Cognitive development theory of dreams

The perspective that dream content reflects the dreamer's brain maturation, cognitive knowledge, and simulation of reality.

Consciousness

Our subjective awareness of ourselves and our environment.

Cognitive neuroscience

The interdisciplinary study of brain activity linked with mental processes such as perception, thinking, memory, and language.

Parallel processing

Simultaneously handling multiple aspects of a stimulus or problem.

Sequential processing

Handling one aspect of a stimulus or problem at a time, typically used for novel information or complex tasks.

Agnosia

A rare neurological condition where an individual is unable to recognize and identify objects, persons, or sounds despite normally functioning sensory organs.

Suprachiasmatic nucleus (SCN)

A cluster of cells in the hypothalamus that governs circadian rhythms and regulates melatonin secretion.

Circadian rhythm

The internal biological clock that regulates bodily patterns, including temperature and wakefulness, on a roughly 24-hour cycle.

Unihemispheric sleep

An evolutionary adaptation in which one cerebral hemisphere rests while the other remains alert, observed in aquatic mammals and birds.

N1 sleep

A brief transitional stage between wakefulness and sleep characterized by theta waves, rolling eye movements, and potential hypnagogic sensations.

N2 sleep

The baseline stage of sleep accounting for $45\%$ to $60\%$ of total sleep time, characterized by sleep spindles.

N3 sleep

The deepest and most physically restorative stage of sleep, dominated by high-amplitude, slow delta waves.

REM sleep

A paradoxical stage of sleep marked by rapid eye movements, high brain activity, vivid dreaming, and temporary motor paralysis.

Manifest content

In Freudian psychoanalysis, the remembered, surface storyline of a dream that represents a censored, symbolic version of unconscious drives.

Latent content

In Freudian psychoanalysis, the underlying, hidden unconscious drives and wishes that represent the true meaning of a dream.

Information-processing theory of dreaming

The perspective that dreaming helps sift, sort, and consolidate daily experiences into long-term memory.

Activation-synthesis theory

The hypothesis proposed by Hobson stating that dreams are the cerebral cortex's attempt to weave random neural bursts from the brainstem into a coherent narrative.

Cognitive development theory of dreams

The perspective that dream content reflects an individual's brain maturation, cognitive capacities, and simulation of reality.

Brainstem

The oldest part and central core of the brain, beginning where the spinal cord swells as it enters the skull; responsible for automatic survival functions.

Medulla

The base of the brainstem that controls vital autonomic reflexes such as heartbeat and breathing.

Pons

A brainstem structure located above the medulla that coordinates movement and plays a key role in sleep, arousal, and dreaming.

Reticular formation

A nerve network traveling through the brainstem and thalamus that plays a critical role in controlling arousal and alertness.

Thalamus

The sensory control center atop the brainstem that directs incoming messages to cortical receiving areas and transmits replies to the cerebellum and medulla, relaying all senses except smell.

Cerebellum

The rear brain structure that coordinates voluntary movement and balance, processes sensory input, and enables nonverbal procedural learning.

Limbic system

A neural system located below the cerebral hemispheres associated with emotions, basic drives, and memory formation.

Amygdala

Two almond-shaped neural clusters in the limbic system linked to emotional processing, particularly fear, aggression, and threat detection.

Hypothalamus

A subcortical structure lying beneath the thalamus that directs maintenance activities like eating, drinking, and body temperature regulation, while governing the endocrine system through the pituitary gland.

Hippocampus

A neural structure in the limbic system essential for processing and consolidating conscious, explicit memories for long-term storage.

Corpus callosum

The large band of neural axon fibers connecting the two cerebral hemispheres, enabling communication and message transfer between them.

Cerebral cortex

The intricate outer layer of interconnected neural cells covering the cerebral hemispheres; serves as the ultimate control and information-processing center.

Frontal lobes

The anterior portion of the cerebral cortex involved in speaking, voluntary muscle movements, planning, decision-making, and executive functioning.

Parietal lobes

The portion of the cerebral cortex lying at the top rear of the head that receives and processes sensory input for touch, temperature, pain, and body position.

Occipital lobes

The posterior region of the cerebral cortex that receives and interprets visual information from the eyes.

Temporal lobes

The lateral regions of the cerebral cortex situated roughly above the ears that process auditory information and play key roles in language and facial recognition.

Motor cortex

An arch-shaped region at the rear of the frontal lobes that controls voluntary bodily movements by sending signals down to muscles.

Somatosensory cortex

A strip of tissue at the front of the parietal lobes that registers and processes bodily sensations of touch, pressure, and movement.

Broca's area

A specialized region usually located in the left frontal hemisphere that directs the muscle movements necessary for speech production.

Wernicke's area

A specialized region typically situated in the left temporal hemisphere responsible for language comprehension and meaningful expression.

Pituitary gland

The endocrine system's master gland, controlled by the hypothalamus, which secretes growth hormone and stimulates other glands to release hormones.