Humans have been aware for quite some time that the unconscious—a powerful yet mysterious force that exerts some degree of control over us—must exist. But what exactly is it? It can’t be accessed directly, and the technologies for observing brain activity are relatively recent. So over time, numerous theories about the unconscious have been proposed, including concepts for what it does, what its purpose is, and what’s actually in it.

The various, often competing, theories of the unconscious have clouded our current understanding of it.

Some earlier theories have been proven to be partially (even surprisingly) correct, while others appear to be far off the mark. The current perspective of the unconscious has challenged many cherished and long-held beliefs. For one thing, it has added considerable fuel to the debate about free will, which is normally the province of philosophers and religious scholars.

There remains some disagreement, mainly within different branches of psychology, about how the unconscious functions and what it does. But although there is much left to discover about the unconscious—and about the brain, in general—we have learned quite a bit about it in the past few decades.

The Freudian View
It’s a jungle down there.

The idea of the unconscious existed before Freud, but his model is the one most closely associated with the concept.

He came up with the “tip of the iceberg” view of the conscious and unconscious aspects of the mind.

Freud was correct in regard to the powerful impact of the unconscious on our thoughts, feelings, and behavior: we are not entirely aware of what we think and often have no idea why we do some of the things we do.

He based his model of the unconscious on case studies involving “abnormal thought and behavior.” It was not arrived at by scientific experimentation, many of the tools of which were unavailable to him.

Freud thought the unconscious contained repressed thoughts, feelings, and memories, which were too disturbing to admit to consciousness. He didn’t think people repressed things intentionally. He thought the unconscious, at least in part, determined what was repressed.

Over the years, empirical tests have not been kind to the specifics of the Freudian model, though in broad-brush terms the cognitive and social psychological evidence does support Freud as to the existence of unconscious mentation and its potential to impact judgments and behavior. —John A. Bargh and Ezequiel Morsella, The Unconscious Mind

He believed there was an aspect of consciousness called “preconscious” that contained thoughts, ideas, memories, etc. that were not in conscious awareness, but that could easily become conscious—meaning they were not repressed.

He also considered the unconscious to be the source of anxiety-provoking drives that were unacceptable to the individual for one reason or another.

He proposed that the unconscious was divided into the id (primitive; the source of drives), the ego (regulator or satisfier of the id; referee between the id and the superego), and the superego (censor of the ego, source of guilt, moral monitor). These concepts are not generally used outside of psychoanalysis, one of the aims of which is to make what is unconscious conscious.

Freud believed we can become aware of some unconscious motivations indirectly through dreams (“the royal road to the unconscious”), slips of the tongue, and free association.

The Jungian View:
It’s a mystical, magical place–but what does it all mean?

Jung believed it was possible to link consciousness to the unconscious through the process of individuation (self-realization). According to Jung, we have a persona—a mask or a false self—that we present to others and to ourselves, but which is not our true or authentic self. Only by “becoming conscious of the unconscious,” which includes facing our shadow—or dark side—can we become who we are meant to be and “fulfill our unique promise.”

Jung believed that “the unconscious had in mind” this process of individuation or self-realization.

James Hillman, who studied with Jung, authored The Soul’s Code: In Search of Character and Calling, in which he wrote, “[T]his book is about calling, about fate, about character, about innate image. Together they make up the ‘acorn theory,’ which holds that each person bears a uniqueness that asks to be lived and that is already present before it can be lived.”

However, psychologists, philosophers, and neuroscientists currently hold the view that we are not one self, but many. Rather than having one persona, we have several personas we present at different times and to different people. Philosopher Julian Baggini endorses a shift from thinking about ourselves as “the thing which has all the experiences of life” to thinking of ourselves as “simply that collection of all experiences in life.”

The true self, as it were then, is not something that is just there for you to discover. You don’t sort of look into your soul and find your true self. What you are partly doing, at least, is actually creating your true self.

While Freud was a religious skeptic, Jung studied a number of different religions and believed in the soul—an immaterial, immortal aspect of a person.

In addition to the personal unconscious (which is unique to each individual), Jung believed there is another layer he called the collective unconscious which contains elements that do not develop from our personal experiences but are inherited by everyone. The components of the collective unconscious, according to Jung, include symbolic motifs, especially in the form of archetypes.

Dream interpretation was central to Jung’s theories, as it was to Freud’s. He considered dreams an important element in the process of individuation, believing they drew on contents of both the personal and the collective unconscious.

The Jamesian View:
It’s not a place or an entity; it’s a set of processes.

William James refuted Freud’s concept or model of the unconscious, but he was well aware of the existence of the unconscious—and of its importance. He was also an excellent observer and without the benefit of any of the tools now available to researchers he arrived at several conclusions about how our minds and brains function that have since been confirmed.

His book, Habits, written in the late 1800s, is worth reading today. He says, “[H]abit diminishes the conscious attention with which our acts are performed.” And, “[N]ot only is it the right thing at the right time that we thus involuntarily do, but the wrong thing also, if it be an habitual thing.”

William James defines the term “ahead of his time.” Before neuroscience gave scientific backing to concepts such as “automaticity,” James was already writing about them. His astounding intuition concerning why we think as we think and act as we act has never been eclipsed and has few parallels in any field. —David DiSalvo, Brain Changer

James is one of the first proponents of the dual-process theory of thinking—the idea that our thinking consists of associative thinking as well as “true reasoning.” In that regard, he drew a pretty accurate bead on the unconscious (associative thinking).

The Neuroscience View:
It’s a web of vast, intricate, processing modules.

Because early theories about the unconscious were primarily (or purely) psychological or philosophical, they did not include an understanding of brain “mechanics”—synapses, neurons, neurotransmitters, etc. So those explanations were incomplete and unscientific.

Beginning about twenty-five years ago, the fields of psychology and neuroscience underwent a revolution. Psychology was primarily using decades-old methods to understand human behavior through things that were objective and observable, such as learning lists of words or the ability to perform tasks while distracted. Neuroscience was primarily studying the communication among cells and the biological structure of the brain.

The psychologists had difficulty studying the biological material—the hardware—that gave rise to thought. The neuroscientists, being stuck down at the level of individual neurons, had difficultly studying actual behaviors. The revolution was the invention of noninvasive neuroimaging techniques, a set of tools analogous to an X-ray that showed not just the contours and structure of the brain but how parts of the brain behaved in real time during actual thought and behavior—pictures of the thinking brain at work. The technologies—positron emission tomography, functional magnetic resonance imaging, and magneto-encephalography—are now well known by their abbreviations (PET, fMRI, and MEG). —Daniel J. Levitin, The Organized Mind: Thinking Straight in the Age of Information Overload

Consciousness is the reasoning, rational part of the brain we’re aware of that makes decisions; it’s what we think of when we think of who we are. The unconscious consists of all the activity behind the scenes that keeps us alive and maintains our model of the world. The unconscious contributes to our conscious sense of self much more than we are aware. But because the operations of the unconscious are invisible to us, we tend to dismiss or discount them (or in some cases, invest them with magical superpowers).

The unconscious keeps us alive; if it intends anything for us, it intends for us to survive.

Many of the operations of the unconscious are universal—they work pretty much the same for everyone. But since one of the jobs of the unconscious is to create our particular model of the world, other elements in it are unique—or at least not identical—for each individual.

Our unconscious programs are constantly being tweaked, usually without our being aware of it. That programming initiates our responses to what happens to us, which is why we often react in ways that surprise us. It’s also why habits get formed without our intending them—and why they are so hard to change even when we want to change them. It’s why we can—and do—do, think, and feel so many things on autopilot.

The new model of the unconscious is a more mechanical model than the models of Freud or Jung. But this model more accurately describes and explains how and why we do the things we do, think the things we think, and feel the things we feel.

It’s also an enlightened model that offers a straightforward and practical approach to understanding ourselves and others, changing undesirable behavior, and creating more of the life we want to have and a world we want to live in.