Famed psychologist Sigmund Freud believed dreams were symbolic expressions of desire.

Salvador Dalí idolized Freud but was disappointed after they met

Sigmund Freud's writings on dreams and the unconscious profoundly influenced Dalí and his work, and the artist came to idolize the Austrian psychoanalyst. When they met, Freud viewed Dalí as an odd curiosity, and the artist came away disappointed, significantly lowering his opinion of the psychoanalyst.

For most of recorded history dreams were considered divine in origin.

What do your dreams mean, according to science

Humans have been interpreting dreams as signs from deities, spirits, or the psyche for ages, and research shows that reflecting on and analyzing one's dreams can be beneficial. In alignment with dreams' elusive nature, they have no objective or clearly assigned meaning. However, variations of common dreams, such as a surprise exam in a forgotten class, are rife with shared primal fears.

Surrealism toyed with ideas from psychoanalysis

The movement's artists were interested in the ideas being explored in the burgeoning fields of psychology and psychoanalysis. Dalí, in particular, often created works that toyed with Freudian theories.

Who was Freud and what did he say?

Sigmund Freud is one of the most famous psychologists and is widely cited—but do you really know the basics of what he taught? Here's a super brief breakdown of his major insights.

What is Freud's idea of the unconscious?

The unconscious has become a widely used term, but Freud meant something quite specific. Here's a look into his technical use of the term.

The study of dreams, formally called oneirology, has evolved over the centuries, from anecdotal interpretations to advanced brain imaging.

How your subconscious influences your decisions

How much of your desires and daily choices are truly yours? One of the most effective ways to influence someone's subconscious is when they're asleep. To study this possibility, researchers trained participants to be able to dream lucidly, a phenomenon that occurs when a dreamer knows they're dreaming.

Dreams have long been used for religious and political power.

The dreaming brain, as understood by scientists

Technology has advanced to where the seemingly separate fields of psychology and neuroscience are asking the same questions about dreams, such as whether they're more closely related to perception or visualization. Some field-intersecting findings include research that shows people with impaired face perception don't dream of faces, those with brain legion-related cognition difficulties deal with similar issues in dreams, and children's dreams change in parallel to their cognitive development.

Carl Jung proposed the controversial idea of the 'collective unconscious'—all humans share a common psychic realm.

Dream interpretation has evolved from ancient mystical explanations, to dream reports, to tracking electrical activity in the brain and more.

Dreaming under the Nazi Regime

Days after Hitler seized power, a man told psychoanalyst Charlotte Beradt that he had dreamed of being forced to raise his arm in a Nazi salute ("It took me half an hour to get my arm up, inch by inch"). Beradt recorded this dream and many others so they "might one day serve as evidence." This is an English translation of her work, "The Third Reich of Dreams."

The earliest record of dream interpretation dates to Ancient Sumer, an analysis of a Sumerian priest king's dream around 2700 BCE.

The ideas of Einstein and Freud combined in 'The Persistence of Memory'

The Persistence of Memory was painted on a canvas roughly the size of a sheet of paper, depicting a desolate landscape with melting clocks, ants, and a distorted figure. The piece incorporates Freud and Einstein's ideas, resulting in a haunting composition symbolizing time's fluidity and Dalí's personal anxieties.

Jungian archetypes can reveal personality traits

Swiss psychologist Carl Jung argued that we’re drawn to familiar character types—such as heroes, caregivers, or rebels—because they reflect universal archetypes embedded in the human subconscious. He believed these patterns shape behavior, motivation, and personal growth.

Apophenia, the cognitive bias that leads people to find meaning in randomness, helps explain why humans look for meaning in their dreams and even in their tea leaves.

Dreams largely occur during REM sleep (but not entirely).

Sleep is no longer considered a binary state—scientists are seeking to map a variety of liminal states between sleep and waking, including the hypnagogic state associated with boosts of creativity.

Visualizing how we dream via Google search trends

When dreams perplex us, we often want to understand them—and in the age of Google, millions go to its search engine to find answers. Now, researchers have compiled a decade's worth of dream-related queries to glean dream trends across seven languages. See what dream was most commonly searched in Arabic in 2015, or what fears and hopes are specific to one culture and time alone with this unique visual essay.

Freud and Jung were once friends. What drove them to break up?

Austrian psychologist Sigmund Freud and Swiss psychiatrist Carl Jung were fast friends, immediately hitting it off the first time they met in 1907. This four-minute video dives into the intellectual divide that drove them apart.

Studies of psychedelic use may help shed light on the nature of consciousness

The nature of consciousness—what it is, where it comes from, and how it manifests as moment-to-moment experience—remains under debate by scientists. Recent studies show psychedelics were found to boost low-frequency brain signals known as delta waves, a behavior also seen during dream states.

Alfred Hitchcock's 1945 film 'Spellbound,' starring Ingrid Bergman, features a surreal scene designed by Salvador Dalí.

Wilhelm Wundt's place in the history of psychology

While ancient philosophers considered the central problems of psychology, it was Wilhelm Wundt who first called himself one. Here's a quick video overview of his contribution.

Wilhelm Wundt, the forgotten father of modern psychology

He was the first psychologist to call himself one, and he influenced a whole generation of early psychologists. Learn about the life and works of Wilhelm Wundt with this thorough entry from a philosophy encyclopedia.

What is psychoanalysis?

This nine-minute video, the first of a four-part series, seeks to answer the questions: what is psychoanalysis, and is it weird? The answer to the latter question is overwhelmingly yes. The answer to the first question is a bit...

Why do dreamers twitch?

This thought-provoking piece highlights newer research suggesting sleep twitches may not be random dream leftovers, but instead a crucial way our brains map and understand our bodies. From sleeping rat pups to dreaming octopi, this biological mapping system appears universal across animal species.

Who was Salvador Dalí?

Salvador Dalí reshaped modern art with surrealism, symbolism, and eccentricity. This snapshot covers his rise from Spanish prodigy to global icon, his Surrealist break, and his fascination with dreams and celebrity.

Existentialism has been used as a therapeutic tool, with 2 Swiss psychiatrists pioneering the philosophy's concepts to help patients navigate their issues.

Scientists are learning to guide your dreams using sound and touch.

During dream sleep, the brain connects new information learned during the day with information already stored in the mind, creating a revised mind-wide web of associations.

Meet the psychologist who reads people through the art they live with

Dimitrios Tsivrikos, an academic psychologist at University College London, says the art someone hangs in their home reveals as much about them as a bookshelf would. He advises going on a first date at a museum and asking each other about the work on the walls.

Sleep research indicates dogs likely dream about their toys, food, and owners.

Existentialism inspired Franklin Roosevelt and Martin Luther King Jr.

The Danish philosopher, sometimes called “the father of existentialism,” believed that individuals needed to resist the temptation of conformity and instead discover their authentic selves. His work became remarkably influential in the 20th century. In 1944, Roosevelt said that reading Kierkegaard made him understand how the Nazis could’ve enacted so much violence. In 1959, King wrote that existentialism was “especially meaningful for our time.”

Browse and explore dozens of major psychology theories

There are a ton of different psych theories—so here's a breakdown of some of the major ones according to the general psychological focus.

Sartre wrote an 8-hour screenplay for a Freud biopic

Sartre was hired to write the screenplay for what would eventually become John Huston's 1962 film "Freud: The Secret Passion," about the life of the psychoanalyst. Sartre, however, had trouble sticking to the parameters of Hollywood. An early draft was estimated to be five hours long. Rather than shortening it, as Huston suggested, Sartre extended it to eight hours and was eventually removed from the production.

The hippocampus, located deep inside the temporal lobe, appears to play a central role in dreaming and memory, according to recent research on dreaming and damage to that area of the brain.

Sleeping on a problem does seem to help—in fact research published in 2026 suggests scientists can seed people's dreams with sound cues about a difficult puzzle during REM sleep and they'll be better able to solve it.

We dream for around two hours each night, on average, but the exact purposes of dreams remains under investigation.

The scientists trying to prove Jackson Pollock's symbolism

Jackson Pollock is one of the most famous American artists in history. He is well-known for his Abstract Expressionist "drip paintings," which seemed to defy interpretation. But following the artist's posthumous bipolar diagnosis, a team of scientists attempted to prove that his symptoms, including mania and psychosis, caused Pollock to embed images under his thrown paint.

The early art of Dalí represents peak surrealism

When it debuted in New York in 1932, "The Persistence of Memory" captured international audiences with its absurd, dream-like reflection on time. In his later works, Dalí's work evolved and became more of a self-parody. This video breaks down the great Spanish artist's works.

Friedrich Nietzsche theorized that we will live our lives over and over again: the myth of eternal recurrence

Rather than a theory of physics, the idea is designed as a moral argument. While Nietzsche famously eschewed the Christian afterlife, he wanted to avoid the nihilism that results from no longer having such an ultimate horizon. In a mystical moment, the philosopher came to believe that the fleeting moments of our lives would be repeated, presenting a test: would you want to relive this moment? If not, he would argue, you're not living well.

The neurobiology of meaningfulness: the benefits of psychedelics

Psychedelics produce powerful emotions in its users, including a profound sense of meaningfulness. The philosopher William James called this sense "noetic" in the late 19th century, but for decades researchers avoided studying the effects of such drugs on the brain. However, the recent resurgence in psychedelic research has heightened interest in the relationship between this noetic sense resulting from the therapeutic use of drugs. Learn what researchers have found out here.

Animal brain studies show brain activity similar to what we'd expect during dreams, but parsing whether animals are truly dreaming depends on how one defines dreaming and how scientists could prove it.

An estimated 1 in 250 people—a small subset of the population—reports they've never remembered a single dream.

Jean-Paul Sartre believed 'existence precedes essence'

The existentialist figurehead argued that humans are not born with an identity or purpose; instead, they develop them throughout their lives. For Sartre, this meant making meaning for oneself rather than relying on authorities (like religion or government) to provide it.

The widespread violence of World War I birthed surrealism

Following World War I, artists used unconventional forms of expression to make sense of the death and destruction they'd witnessed for years. Life as they knew it had ended, and movements like Surrealism, founded by André Breton, rebelled against tradition.

Several brain regions are involved in lucid dreaming, a state in which a person knows they're dreaming.

The benefits of lucid dreaming

Lucid dreams happen when the dreamer knows they've stepped out of the bounds of waking life. Studies show it can help dreamers cultivate creativity, process grief, and work through trauma. A 2021 study found that 85% of participants with PTSD no longer qualified for the diagnosis after a week of trauma-informed lucid dreaming in which they intentionally witnessed (and therefore integrated) recurring nightmares or changed the outcome completely.

Nightmares are unpredictable, but are linked to stress, anxiety, trauma, and more.