Libido

Abstract

Libido is a concept in psychoanalytic theory, where it names the mental energy of the sexual drive. Sigmund Freud introduced it as a quantitatively variable force that could be dammed, displaced, and discharged, and in 1914 split it into ego-libido invested in the self and object-libido invested in others. Carl Jung broadened the term to a general, undifferentiated psychic energy, the move that precipitated his break with Freud. Modern cognitive and affective science has largely replaced the single hydraulic quantity with a multi-system account: sexual motivation as the balance of separable excitation and inhibition, as the dissociation between wanting and liking, and as a variable rather than fixed property of the person. The economic metaphor is obsolete as mechanism, but the questions libido named remain central, and are now answered with measurement rather than metaphor.

Keywords: libido, sexual drive, psychic energy, incentive motivation, sexual desire

Few psychological terms have travelled as far from their origin as libido. Freud borrowed a Latin word for desire and made it the energetic currency of his entire theory of mind: a drive force, sexual in nature but protean in expression, whose vicissitudes, its damming, redirection, and discharge, explained normal development, neurotic symptoms, and the texture of ordinary life (Freud, 1905/2000; Laplanche & Pontalis, 1973). The Medical Subject Headings file the concept beneath psychoanalytic theory, the family of depth-psychological ideas in which it was coined and within which its meaning was first contested, when Jung widened it past recognition (Jung, 1912/1956). Cognitive psychology does not use libido as an explanatory quantity, but it takes the phenomena the term pointed at, the energy, direction, and persistence of sexual desire, and studies them with the tools of motivation science, psychometrics, and affective neuroscience (Toates, 2009; Berridge & Robinson, 2016).

What Libido Is

Libido is, in its original and still most precise sense, the name Freud gave to the energy of the sexual drive, the Trieb that he placed at the foundation of mental life (Freud, 1905/2000). The word is deliberately quantitative. Freud modelled the mind on the physics and physiology of his training, as an economic system in which a finite quantity of excitation seeks discharge, and libido is the specifically sexual portion of that quantity (Freud, 1923/1990). This economic framing is what lets the theory speak of desire being dammed up when discharge is blocked, displaced from a forbidden object onto an acceptable substitute, or sublimated into non-sexual work, each a transformation of one underlying energy (Laplanche & Pontalis, 1973).

Two features of the concept matter for everything that follows. First, libido is a drive energy, not a feeling: it is the force behind desire, inferred from its effects, not the conscious experience of wanting. Second, Freud held that libido is labile, able to attach to a wide range of objects and aims, which is why the same energy can appear as infantile thumb-sucking, adult sexuality, a neurotic symptom, or a work of art (Freud, 1905/2000; Freud, 1933/1965). The sections below trace the concept from Freud's original formulation, through Jung's contested broadening, to the modern empirical programmes that have dismantled the single-energy model while preserving the questions it raised.

Freud's Libido: The Energy of the Drive

Freud set out the concept in the Three Essays on the Theory of Sexuality (1905), the work that scandalised his contemporaries by extending sexuality back into infancy (Freud, 1905/2000). The claim was not that infants have adult sexuality but that a single libidinal energy organises itself around successive bodily zones as the child develops, the oral, anal, and phallic phases, before converging in adolescence on genital sexuality. Development could go wrong by fixation, an excess of libido bound to an early phase, or by regression, a retreat of libido to a point of earlier fixation under stress, and the pattern of fixation and regression was Freud's template for explaining adult character and neurotic symptoms.

Libido also carried the theory's dynamics. In the first drive theory, libido (the sexual drive) stood opposed to the self-preservative ego drives; in the revised theory of 1920, Freud subsumed both under Eros, the life drive, and set it against a death drive, so that libido became the energy of Eros as such (Freud, 1920/1961). When Freud reorganised the mind into the structural model of id, ego, and superego, libido was recast again as energy originating in the id and deployed by the ego, which could bind it, redirect it, or be overwhelmed by it (Freud, 1923/1990). Across these revisions the constant is the economic picture: a quantity of sexual energy whose distribution, blockage, and discharge drive the system, a picture Freud maintained to the end (Freud, 1933/1965).

Ego-Libido and Object-Libido

The most consequential refinement came in On Narcissism (1914), where Freud divided libido by its target (Freud, 1914/1957). Object-libido is sexual energy invested, or cathected, in external people and things; ego-libido (narcissistic libido) is energy invested in the self. Freud called this investment a cathexis, and the economic model is in essence a bookkeeping of how a finite quantity of cathexis is distributed between self and world. Freud proposed that the two stand in a roughly inverse relation around a conserved total: the person who falls deeply in love pours libido into the object and is correspondingly depleted in the ego, while the withdrawal of libido from the world back onto the self characterises states from physical illness and sleep to the grandiosity of narcissism and the self-reproach of melancholia.

This conservation claim is the sharpest and most testable form of the economic hypothesis, and it is the one the first model below renders. The idea that attention and investment are zero-sum, that caring intensely about one thing withdraws investment from another, survives in weaker form in modern work on the allocation of motivation and attention, even though the literal hydraulics of a conserved libidinal fluid does not (Toates, 2009). The model lets the reader shift energy between ego and object and see the inverse relation Freud posited, together with the clinical states he mapped onto its extremes.

Jung's Reinterpretation

The concept's first and most famous crisis was internal to psychoanalysis. In Symbols of Transformation (1912) Carl Jung argued that the energy underlying mental life could not be specifically sexual, because the phenomena it had to explain, myth, religion, the symbolism of psychosis, ranged far beyond sexuality (Jung, 1912/1956). He redefined libido as a general, undifferentiated psychic energy, a life force of which sexuality was only one channel, aligning the term more with the older philosophical notion of a vital drive than with Freud's instinct theory.

The disagreement was not a detail but a fault line, and it ended the collaboration between the two men in 1913. For Freud the desexualisation of libido emptied the theory of its explanatory core and its clinical bite; for Jung the sexual restriction was a dogma that the evidence of comparative symbolism did not support. The modern reader can see that both were partly right: Freud was correct that a theory of sexual motivation needs a specifically sexual construct and cannot be rescued by dilution into a generic energy, while Jung was correct that a single undifferentiated drive, sexual or otherwise, is too blunt an instrument for the phenomena. The resolution, reached only decades later, was not to choose between one energy and another but to abandon the single-energy framework altogether. For the system Jung built on his redefinition, see Jungian theory.

From Drive to Incentive

The decisive break with the libido concept came from motivation science, not from within psychoanalysis. Freud's model is a drive-discharge or hydraulic model: an internal energy builds up, creates tension, and is reduced by consummatory behaviour, exactly the structure of the mid-century drive theories of Hull and others. That framework foundered on a simple empirical fact: sexual and many other motivated behaviours are controlled far more by external incentives, the presence and quality of a stimulus, than by the internal accumulation of a need the drive model requires (Toates, 2009). An animal sated by any reasonable measure of internal drive will resume vigorously when a novel partner is introduced, a result the pure drive model cannot accommodate.

The replacement is an incentive-motivation framework, in which desire arises from the interaction of an internal state with the incentive properties of a stimulus, rather than from internal pressure alone (Toates, 2009). Its neural counterpart is the identification of a subcortical appetitive system, the SEEKING system in Panksepp's affective neuroscience, that energises approach to a wide class of rewards and that many read as the closest biological analogue of a generalised libidinal drive, though it is appetitive rather than specifically sexual (Panksepp, 1998). The brain systems supporting human sexual response have since been mapped in detail, confirming a distributed architecture of appetitive, consummatory, and inhibitory components rather than a single energy centre (Georgiadis & Kringelbach, 2012).

The Dual Control Model

If one idea has replaced libido as the working model of sexual motivation, it is the dual control model of Bancroft and Janssen (Bancroft & Janssen, 2000). Its central claim is that sexual response is the net product of two separable and independent systems, a sexual excitation system that responds to sexually relevant stimuli and a sexual inhibition system that suppresses response in the face of threat, distraction, or cost. Each varies across individuals as a relatively stable propensity, and the two are not opposite ends of one scale but distinct dimensions that can be high or low independently.

This is a decisive departure from the single-quantity picture. Under the libido model, a person has more or less sexual energy, and response tracks that quantity. Under dual control, two people with identical excitation can differ sharply in response because they differ in inhibition, and clinically important phenomena, sexual difficulties under stress, risk-taking, the paradoxical loss of response precisely when it matters most, fall out naturally as patterns of high or low inhibition rather than as deficits or excesses of a single drive. The model below sets excitation and inhibition independently and shows the response tendency their balance produces; the worked example computes a case in full.

Wanting Versus Liking

A second dissociation cuts the old concept along a different axis. Freud's libido conflated two things that Berridge and Robinson's work on reward has shown to be neurally and psychologically distinct: wanting, the incentive salience that makes a stimulus attractive and drives approach to it, and liking, the hedonic pleasure obtained from it (Berridge & Robinson, 2016). The two are normally correlated, which is why they feel like one thing, but they are generated by different brain systems and can be pulled apart: dopaminergic manipulations raise wanting without raising liking, and in addiction wanting can escalate even as liking declines.

For the libido concept this is a precise and damaging decomposition. A single energetic quantity cannot be simultaneously high and low; two dissociable processes can. Desire that is intense yet joyless, or pleasure without craving, are contradictions for the libido model and ordinary findings for the wanting-liking framework. The same logic reaches into clinical sexuality, where discrepancies between what a person pursues and what they enjoy are common and intelligible once the two systems are separated (Berridge & Robinson, 2016; Georgiadis & Kringelbach, 2012). The figure in the next section shows how far the modern decomposition has travelled from a single energy.

Measuring Desire

The classical concept treated libido as something a person has in fixed amount, a disposition as stable as a trait. Psychometric and longitudinal work has made that assumption untenable. Sexual desire can be measured reliably, most widely with the Sexual Desire Inventory, which separates dyadic desire (for a partner) from solitary desire and treats each as a graded, quantifiable construct rather than a single libidinal level (Spector et al., 1996). Once desire is measured rather than postulated, two findings follow that the libido model did not predict.

First, desire is variable, fluctuating within a person across time, context, and relationship far more than a fixed quantity should (Diamond, 2016; Mark & Lasslo, 2018). Second, the sexual-desire system is dissociable from the romantic-attachment system: Diamond showed that the processes governing sexual desire and those governing pair-bonded love are distinct, with different developmental courses and different neurochemistry, so that a person can desire without loving and love without desiring (Diamond, 2004). Figure 1 contrasts the two pictures: a flat libidinal constant against the fluctuating, context-dependent desire that measurement actually finds.

Figure 1

Worked Example

The dual control model's central advantage over libido is that it predicts response from two numbers, not one, and the second model above renders the consequence. Suppose sexual response tendency is written as a logistic function of excitation E and inhibition I, P(response) = 1 / (1 + e^−z) with z = β₀ + β_E·E − β_I·I, and take illustrative weights β₀ = −1.0, β_E = 1.2, β_I = 1.0 on a 1–5 propensity scale. These numbers are didactic, chosen to make the structure visible, not estimated parameters.

Consider two people with identical sexual excitation, E = 4, who differ only in inhibition. Person A is a low inhibitor, I = 1: z = −1.0 + 1.2(4) − 1.0(1) = 2.80, so P = 1 / (1 + e^−2.80) = 0.943, a 94.3% response tendency. Person B is a high inhibitor, I = 4: z = −1.0 + 1.2(4) − 1.0(4) = −0.20, so P = 1 / (1 + e^0.20) = 0.450, a 45.0% response tendency. Identical excitation, a 49-point gap in response, produced entirely by the second dimension.

The libido model cannot express this case, because it has only one quantity to assign, and whatever value it gives these two people, high or low, it must give them the same prediction, since their excitation is identical. The dual control model separates them because it carries the inhibition the single-energy picture omits. This is the worked form of the chapter's argument: the phenomena libido was built to explain are real, but they take at least two numbers to describe, and that is precisely what a single energy cannot supply (Bancroft & Janssen, 2000).

Discussion

The right verdict on libido is that it was the correct question wrapped in an obsolete mechanism. Freud identified a genuine and central problem, what energises, directs, and sustains sexual and appetitive motivation, and proposed a nineteenth-century answer: a single hydraulic energy, conserved, displaceable, and dischargeable. The energy has not survived as mechanism. It cannot represent the independence of excitation and inhibition, the dissociation of wanting from liking, or the measured variability of desire, and each of those is now a robust finding rather than a speculation (Bancroft & Janssen, 2000; Berridge & Robinson, 2016; Diamond, 2016).

What remains is the agenda. The appetitive SEEKING system, the mapped circuitry of human sexual response, and the neuroendocrine substrate of desire are all, in part, attempts to answer Freud's question with the methods he lacked (Panksepp, 1998; Georgiadis & Kringelbach, 2012). Neuropsychoanalysis has argued explicitly that some psychoanalytic claims about drive survive translation into neuroscience even as the specific economics of libido does not, a position that treats Freud's question as live while conceding his mechanism (Solms, 2018). The concept's fate is the ordinary fate of a strong first theory: its phenomena were real, its mechanism was wrong, and its true legacy is the research programme that corrected it.

Current Directions

The most active empirical front is the neuroendocrine and neural specification of desire, which replaces the single energy with identified signals. Work on the hormonal regulation of sexual motivation has detailed how testosterone, oestradiol, and neuropeptides modulate the excitation and inhibition systems rather than setting a single libidinal level, and has begun to connect these to the mapped human sexual-response circuitry (Swift-Gallant & Monks, 2017; Georgiadis & Kringelbach, 2012). A second front is the study of desire over time and in relationships: longitudinal and dyadic designs now treat the maintenance of desire, and its decline, as outcomes to be predicted from relational and contextual variables, a research question that only becomes askable once libido is abandoned as a fixed constant (Mark & Lasslo, 2018; Diamond, 2016).

A third strand is conceptual rather than empirical. Neuropsychoanalysis continues to ask which of psychoanalysis's drive-theoretic claims can be restated in the vocabulary of affective neuroscience, using Panksepp's emotion systems as the bridge and taking seriously the possibility that a generalised appetitive drive, if not a sexual one, has a real neural basis (Solms, 2018; Panksepp, 1998). What unites the three is the strategy that has served the study of motivation best: keep the phenomenon Freud named, the energy and direction of desire, and answer it with measurement, dissociation, and identified mechanism rather than with a single postulated fluid.

Key Researchers

John Bancroft

(contemporary). Former director of the Kinsey Institute and co-originator, with Erick Janssen, of the dual control model, which recast sexual response as the balance of separable excitation and inhibition systems rather than a single libidinal quantity. Wikipedia

Kent C. Berridge

(contemporary). Established the dissociation between wanting (incentive salience) and liking (hedonic pleasure), showing that the attraction of a reward and the pleasure it yields are generated by different brain systems, a decomposition that the single-energy concept of libido cannot represent. Wikipedia · ORCID

Lisa M. Diamond

(contemporary). Demonstrated that the sexual-desire system and the romantic-attachment system are distinct, and that sexual desire varies within a person over time, undercutting the classical picture of libido as a single fixed constant. Wikipedia

Sigmund Freud

(1856–1939). Introduced libido as the energy of the sexual drive, traced its developmental organisation in the Three Essays, and split it into ego-libido and object-libido in On Narcissism; the originator of the concept and of the economic model of mind it anchored. Wikipedia

Carl Gustav Jung

(1875–1961). Redefined libido as general, undifferentiated psychic energy rather than specifically sexual drive in Symbols of Transformation, the theoretical move that precipitated his break with Freud and founded analytical psychology. Wikipedia

Jaak Panksepp

(1943–2017). Identified the subcortical SEEKING system, the appetitive-motivation circuit widely read as the closest neural analogue of a generalised libidinal drive, in his affective neuroscience of the emotional brain. Wikipedia

Mark Solms

(contemporary). A leading figure in neuropsychoanalysis who has argued for which psychoanalytic claims about drive, libido among them, survive translation into contemporary affective neuroscience, and which do not. Wikipedia

Frederick Toates

(contemporary). Built the integrative incentive-motivation framework for sexual desire, superseding the hydraulic drive-discharge model of libido with a stimulus-and-reward account of how desire is energised and directed. ORCID

Glossary

Cathexis.

The investment of libidinal energy in an object, person, idea, or part of the self; the mechanism by which Freud's economic model distributes a finite quantity of drive energy.

Drive (Trieb).

A constant internal force pressing toward discharge; in Freud's theory the source of libido, standing at the border of the mental and the somatic.

Dual Control Model.

The model of Bancroft and Janssen in which sexual response is the net product of two independent systems, sexual excitation and sexual inhibition, rather than a single drive quantity.

Economic Model.

Freud's treatment of mental life as the distribution, transformation, and discharge of a finite quantity of psychic energy; the framework within which libido is a measurable magnitude.

Ego-Libido.

Libidinal energy invested in the self rather than in external objects; also called narcissistic libido, it rises as object-libido falls in Freud's conserved economy.

Eros.

In Freud's late theory, the life drive that subsumes the sexual and self-preservative drives and whose energy is libido; opposed to the death drive.

Fixation.

An excess of libido bound to an early developmental phase; a predisposing point to which libido may later regress under stress, central to Freud's account of symptom formation.

Incentive Motivation.

The framework in which desire arises from the interaction of an internal state with the incentive properties of a stimulus, replacing the drive-discharge model in which internal pressure alone drives behaviour.

Libido.

In Freudian theory, the mental energy of the sexual drive, quantitatively variable and able to be displaced, sublimated, or discharged; in Jung's revision, general psychic energy.

Liking.

In Berridge and Robinson's framework, the hedonic pleasure actually obtained from a reward; dissociable from the wanting that drives approach to it.

Object-Libido.

Libidinal energy invested in external people or things; its intensification in love is, for Freud, matched by a depletion of ego-libido.

Psychic Energy.

Jung's generalised redefinition of libido: an undifferentiated life force underlying all mental activity, of which sexuality is only one expression.

Sexual Desire Inventory.

A validated self-report instrument that measures sexual desire as a graded construct, separating dyadic desire for a partner from solitary desire.

Sublimation.

The redirection of libidinal energy from a sexual aim onto a socially valued, non-sexual activity; in Freud's theory a mature transformation of the drive rather than its repression.

Wanting.

In Berridge and Robinson's framework, the incentive salience that makes a stimulus attractive and drives approach to it; dissociable from the liking, or pleasure, it yields.

Frequently Asked Questions

What is libido in psychology?

Libido is Freud's term for the mental energy of the sexual drive: a quantitatively variable force that can be dammed up, displaced onto substitute objects, sublimated into non-sexual work, or discharged. It is the energetic currency of psychoanalytic theory, inferred from its effects rather than experienced directly (Freud, 1905/2000; Laplanche & Pontalis, 1973).

Did Freud think libido was only sexual?

Yes, and this was the point of contention with Jung. For Freud libido was specifically the energy of the sexual drive, even when displaced or sublimated into apparently non-sexual activity. In his late theory it became the energy of Eros, the life drive, but it remained sexual in origin (Freud, 1920/1961; Freud, 1923/1990).

How did Jung's view of libido differ from Freud's?

Jung rejected the sexual restriction and redefined libido as general, undifferentiated psychic energy, a life force of which sexuality is only one channel. This disagreement, set out in Symbols of Transformation, ended their collaboration in 1913 (Jung, 1912/1956).

What is the difference between ego-libido and object-libido?

Object-libido is sexual energy invested in external people and things; ego-libido is energy invested in the self. Freud held that the two trade off around a conserved total, so intense love of another depletes the self while withdrawal onto the self characterises illness, narcissism, and melancholia (Freud, 1914/1957).

Do psychologists still use the concept of libido?

Not as an explanatory mechanism. Modern cognitive and affective science has replaced the single energy with separable systems, excitation versus inhibition, wanting versus liking, and treats sexual desire as a measurable, variable construct. The phenomena libido named remain central; the hydraulic energy does not (Bancroft & Janssen, 2000; Berridge & Robinson, 2016).

What is the dual control model of sexual response?

It is the model of Bancroft and Janssen in which sexual response is the net product of two independent systems, a sexual excitation system and a sexual inhibition system. Two people with identical excitation can respond very differently because they differ in inhibition, which a single libido quantity cannot capture (Bancroft & Janssen, 2000).

What is the difference between wanting and liking?

Wanting is the incentive salience that makes a reward attractive and drives approach to it; liking is the pleasure actually obtained. Berridge and Robinson showed the two are generated by different brain systems and can be pulled apart, so desire can be intense yet joyless, a decomposition the single-energy concept of libido cannot express (Berridge & Robinson, 2016).

Is libido a fixed quantity each person has?

No. When sexual desire is measured rather than postulated, it varies substantially within a person across time, context, and relationship, and the desire system is dissociable from the romantic-attachment system. Both findings contradict the classical picture of libido as a stable personal constant (Diamond, 2004; Diamond, 2016).

References