Between the social unconscious and the psychic group apparatus: On the work of Earl Hopper and René Kaës – A comparative obituary and theoretical overview

With the passing of Earl Hopper (1940–2025) and René Kaës (1936–2026), psychoanalytic group therapy and group analysis lost two of its most important theoretical voices of the 20th and early 21st centuries within a few months. Coming from different traditions, both fundamentally deepened and expanded our understanding of unconscious processes in groups. This article provides a comparative overview of their central concepts, highlights their respective references to Freud, Foulkes, Bion, and others, and emphasizes both the convergences and the productive differences between the two thinkers.

Keywords: group analysis, social unconscious, psychic group apparatus, fourth basic assumption, unconscious alliances, traumatic experience, intersubjectivity

I. Introduction: Two voices fall silent

On November 3, 2025, Earl Hopper died in London at the age of 85. Only a few months later, on February 1, 2026, René Kaës passed away in Lyon at the age of 89. Their almost simultaneous deaths mark the end of an era in psychoanalytic group theory: Coming from very different intellectual and cultural backgrounds, both men enriched thinking about groups, the collective unconscious, and the conditions for the possibility of group therapy and group analysis in a way that can hardly be overestimated.

Hopper, born in Brooklyn, New York, and raised in the US and England, was a sociologist, psychoanalyst, and group analyst. He stood firmly in the British tradition of S.H. Foulkes and developed it further in his engagement with Bion, object relations theory, and his own sociological research. Kaës, born in Fameck, Lorraine, was a psychologist, psychoanalyst, and university professor at the Universities of Aix-Marseille and Lyon. He was a close intellectual friend of Didier Anzieu and developed an original, metapsychologically ambitious theory of the psychic group apparatus that was deeply rooted in the Freudian tradition and at the same time pointed far beyond it.

What connects these two very different thinkers? Above all, this: the conviction that the unconscious has an essentially social and collective dimension that cannot be reduced to or separated from the individual unconscious; that groups are psychic realities of their own kind, with their own processes, their own defenses, their own creative possibilities; and that psychoanalysis that stops at the dyadic relationship is fundamentally incomplete.

II. Earl Hopper: Social Unconscious, Incohesion, and Traumatic Experience

2.1 Intellectual Career and Background

Hopper is a rare figure: he was both a sociologist in the strict academic sense—his work Social Mobility (1981) is an important contribution to British sociology—and a clinical group analyst. This dual affiliation shaped his entire thinking. He always insisted that the psychological processes in groups cannot be understood without taking into account their social, cultural, and political embeddedness. According to Hopper, an analyst who ignores the social determinants of psychological life works within an artificially limited framework.

Hopper was strongly influenced by Foulkes, but also worked intensively with Bion’s concepts, object relations theory (Winnicott, Klein), ego psychology, and infant and trauma research. He was the long-time editor of the New International Library of Group Analysis and president of the IAGP.

2.2 The social unconscious

The concept of the social unconscious is Hopper’s most important theoretical contribution. He defines it as the unconscious constraints that arise from social, cultural, communicative, and political arrangements that people share—without necessarily being aware of these arrangements. The social unconscious is thus to be distinguished from the personal unconscious (which is the subject of classical individual analysis) and from the group unconscious in Bion’s sense (which refers to the basic assumptions in immediate group interaction).

Hopper understands the social unconscious as having three levels: it comprises the Foundation Matrix (a basic social and cultural structure of shared experiences and meanings that exists even before entering a group), the Dynamic Matrix (the matrix that emerges in the here and now of the group), and the Personal Matrix (the individual biographical dimension). He later developed the concept of the Tripartite Matrix, which systematically relates these three levels to each other.

Hopper thus takes up Foulkes’ concept of the matrix, but clarifies and expands it considerably: for Foulkes, the matrix was primarily a communication network within the therapeutic group; Hopper emphasizes the macrosocial, transgenerational, and cultural dimension that precedes and permeates this matrix.

2.3 The fourth basic assumption: incohesion – aggregation/massification

Hopper’s best-known conceptual work is the formulation of a fourth basic assumption in the unconscious dynamics of groups, which he first presented in the late 1980s and explained in detail in his book Traumatic Experience in the Unconscious Life of Groups (2003).

Bion had described three basic assumptions: dependency, fight-flight, and pairing. Hopper added incohesion to these: aggregation/massification – or, in his abbreviation, (ba) I:A/M. This acronym, reminiscent of “I AM,” is significant for Hopper: It refers to the threat to personal identity that underlies this basic assumption.

Incohesion describes a state of fundamental lack of cohesion within the group, which manifests itself in two polar forms: Aggregation refers to a state in which group members isolate themselves from each other, avoid contact, and develop a kind of psychological armor – Hopper refers to this as crustacean mode. Massification refers to the opposite pole: boundaries between members dissolve, individuation is abandoned, and an amoeboid fusion occurs—Hopper refers to this as amoeboid mode.

The crucial point is that both poles are defense formations against the same underlying fear—the fear of annihilation (annihilation anxiety). This fear has its roots in traumatic experiences, especially those with social, cultural, or political dimensions. The fourth basic assumption is thus a theory of the group under the sign of trauma.

2.4 Trauma, encapsulation, and transgenerational transmission

Hopper has had a lasting influence on the topic of trauma in group analysis. Based on his clinical work with survivors of the Shoah and other traumatized groups, he developed the concept of encapsulation: a psychological “shell” that protects a traumatically frozen self, but at the same time cuts it off from the world.

Encapsulation is a defense against the fear of annihilation and is closely related to the aggregation pole of the fourth basic assumption.

Hopper was also an important theorist of the transgenerational transmission of traumatic experiences within the social unconscious. Traumas are not only passed on individually, but also through social, cultural, and institutional structures—the matrix—across generations.

2.5 References to Freud, Foulkes, Bion, and others

Hopper’s relationship to Freud is productively critical. He values Freud’s Group Psychology and the Ego (1921) as fundamental to thinking about groups, but criticizes Freud’s reduction of collective phenomena to the individual and the father figure. The horizontal, sibling-like dimension of group life is largely absent in Freud—a deficiency that Hopper also addresses.

Hopper shares with Foulkes the concept of the matrix and the conviction that the individual is fundamentally socially constituted. But Hopper goes beyond Foulkes: He sociologizes the matrix, giving it a macrosocial depth that remains implicit in Foulkes, who was more of a physician and clinician than a social scientist.

Hopper shares Bion’s interest in the unconscious basic assumptions of the group. However, he criticizes Bion for neglecting the social context: Bion’s groups exist, as it were, in a social vacuum. The fourth basic assumption is also a criticism of Bion: it emphasizes that traumatic social experiences—not just intrapsychic conflicts—shape group dynamics.

III. René Kaës: The psychic group apparatus, unconscious alliances, and the expansion of psychoanalysis

3.1 Intellectual career and background

René Kaës was a student of Didier Anzieu and, together with him, founded the CEFFRAP (Cercle d’études françaises pour la formation et la recherche en psychanalyse du groupe, psychodrame et institution) in 1962. This framework – training group, psychodrama, institution – shaped his thinking from the outset.

Kaës was a thinker deeply rooted in French psychoanalysis. Freud, Lacan (despite some differences), Winnicott, and Anzieu were his main points of reference. Unlike Hopper, who emphasized the sociological dimension, Kaës was primarily interested in the metapsychology of group dynamics: in the question of which specific psychic structures, processes, and apparatuses constitute the group as a psychic reality.

3.2 The psychic group apparatus

Kaës’ central concept is the appareil psychique groupal – the psychic group apparatus. Following Freud’s concept of the psychic apparatus, Kaës postulates that the group has its own psychic apparatus – with its own functions, structures, and processes that cannot be reduced to the sum of the individual psychic apparatuses of its members.

The psychic group apparatus has its own topography, dynamics, and economy. It enables certain psychic work that would not be possible in an individual setting and is subject to its own defense, bonding, and processing processes. The group is a psychic reality sui generis—neither a mere addition of individuals nor an abstract collectivity, but a specific psychic space.

Kaës developed this concept in his seminal work L’appareil psychique groupal (1976) and systematically expanded on it in later writings. It is the metapsychological basis from which all his other concepts can be understood.

3.3 Unconscious alliances: narcissism, denial, community

One of Kaës’ most important and influential contributions is his theory of unconscious alliances (alliances inconscientes), which he summarized in his work of the same name (2009). Unconscious alliances are agreements between subjects that are not consciously made but which significantly structure group dynamics.

Kaës distinguishes between several forms of such alliances. The narcissistic contract (Contrat narcissique) refers to the mutual agreement that each member acts as the bearer of the group ideal and group identity—a mechanism that ensures cohesion but can also inhibit difference and change. The pacte dénégatif (denial pact) is a particularly important and clinically significant alliance: it refers to a group’s tacit agreement not to think about certain things, not to talk about them, not to symbolize them. What cannot be thought about is often the most traumatic, the most painful, the most threatening to the group.

Another form is the communauté de déni (community of denial), which is based on collective denial. These concepts allow us to understand how groups—both therapeutic and institutional—can be organized around what they cannot say, think, or perceive.

3.4 The subject of the group and inner group cohesion

Kaës developed an original concept of the subject for group psychoanalysis. He distinguished between the sujet du groupe (the subject of the group apparatus – the group as subject) and the sujet de groupe (the subject in the group – the individual, insofar as it is constituted by the group). In his work Un singulier pluriel (2007), he condensed his conception of the subject as fundamentally plural: the subject is never singular, but always constituted in the plural.

Linked to this is the concept of groupalité psychique or groupes internes (inner groups): according to Kaës, the unconscious itself is structured as a group. The internal groups—the internalized relationships, images, scenarios—organize intrapsychic life. The unconscious is, as it were, an internal stage on which groups act.

3.5 Associative chains, transference diffraction, and symbolic function

Kaës described the specific associative processes in groups as chaînes associatives groupales (group associative chains): the free associations of the members combine to form a collective associative stream that goes beyond what each member could produce on their own. The analyst is called upon to listen to and interpret these group associative chains.

According to Kaës, transference in groups undergoes diffraction: it is distributed across several objects—the other members, the analyst, the group as a whole, the setting. This is not fragmentation, but a productive feature of the group setting: it allows for the processing of aspects of transference that would be difficult or impossible to achieve in an individual setting.

3.6 Transgenerational transmission and the expansion of psychoanalysis

Like Hopper, Kaës was also an important theorist of the transgenerational transmission of psychic content. He developed concepts such as that of the function of the phore (phoric function) – the adoption of the unconscious content of others as a carrier or container – and was interested in what is passed on between generations without ever having been symbolized.

In his late work L’extension de la psychanalyse (2015), Kaës formulated an ambitious metapsychological project: a ‘third type of metapsychology’ that goes beyond classical metapsychology of the individual (first type) and intersubjective extension (second type) and develops a theory of psychic processes in groups, institutions, and collective dispositifs. According to Kaës, psychoanalysis must be further developed beyond the boundaries of the subject and the dyadic relationship.

3.7 References to Freud, Anzieu, Bion, and others

Kaës had a deep, dialogical relationship with Freud. He analyzed Freud’s Group Psychology and the Analysis of the Ego, Totem and Taboo, Civilization and Its Discontents, and other social-psychological writings as fundamental texts that needed to be expanded and developed metapsychologically.

Kaës had a lifelong intellectual partnership with Anzieu. Where Anzieu described the Moi-Peau (skin ego) and group illusion, Kaës developed the psychic group apparatus and associative chains. Both were interested in the shells, containers, and envelopes of psychic life in groups.

Bion played a rather limited role for Kaës – less so than for Hopper. He adopted individual concepts (container/contained, the basic defense mechanisms), but criticized Bion’s focus on the psychotic aspects of group life as too one-sided. Kaës was also interested in the productive, symbolizing, creative possibilities of group life.

Winnicott’s concepts of transitional space and play inspired Kaës’ thinking about the group space as a transitional milieu and about what he called analyse transitionnelle.

IV. Convergences and productive differences

4.1 What connects Hopper and Kaës

Despite their different backgrounds, Hopper and Kaës share a number of fundamental beliefs and insights:

First, both share the conviction that the unconscious has an essentially collective dimension. For Hopper, this manifests itself in the social unconscious, for Kaës in inner group belonging and the psychic group apparatus. Both go beyond a dyadic or individual psychological conception of the unconscious.

Second, the transgenerational dimension is of central importance to both. Traumatic experiences are not only passed on individually, but also transmitted across generations through social and psychic structures. Hopper emphasizes the social matrix, while Kaës emphasizes phoric functions and the non-symbolized.

Third, both are convinced that psychoanalysis must be expanded beyond the individual and the dyad. Kaës explicitly speaks of an “extension of psychoanalysis”; Hopper has regarded this as a programmatic concern of his entire work.

Fourthly, both have a deep interest in trauma, defense, and the impossibility of symbolization: Hopper’s encapsulation and his fourth basic assumption correspond to Kaës’ pacte dénégatif and the phoric functions. In both theories, there are areas of psychic life in groups that are sealed off from symbolization.

Fifth, both are linked by a strong clinical commitment: their theories arose from practice and are intended for practice.

4.2 Where Hopper and Kaës differ

The differences between the two are just as significant as the similarities and indicate different focal points that can complement each other.

The most fundamental difference lies in their intellectual tradition and language. Hopper comes from British group analysis (Foulkes), Anglo-American pragmatism, and sociology. Kaës comes from French psychoanalysis and German phenomenology (Husserl is present in the concept of intersubjectivity). This leads to different conceptual languages, different clinical styles, and different emphases.

The two also differ in their emphasis on social and psychological factors. Hopper emphasizes the social, cultural, and political determinants of group life; he is the sociologist among group analysts. Kaës emphasizes the inner psychological reality of the group; he is the metapsychologist. Both thus have an indispensable perspective that is less developed in the other.

There is another difference in relation to Bion: Hopper is an avid reader of Bion, whom he critically expands upon. Kaës is more distant from Bion and emphasizes the creative, symbolizing, and transitive possibilities of group life.

Both pursue different paths in their concept of the subject. Hopper’s subject remains the individual constituted and limited by social structures. Kaës develops a genuine concept of the plural subject – ‘un singulier pluriel’ – which is fundamentally constituted by others and by the group.

Finally, Hopper focuses thematically on trauma and disintegration; the fourth basic assumption is a theory of the group under the sign of the failure of cohesion. Kaës also emphasizes the positive, creative possibilities of the group – the transitional space, the associative chains, the symbolizing function.

V. For clinical practice: What remains

What do the concepts of both thinkers mean for the clinically active group analyst and group psychotherapist? Hopper’s contribution lies primarily in the expansion of analytical listening: it is not enough to focus on the individual histories of the members; the analyst must also integrate the social matrix, the transgenerational dimension, and the traumatic backgrounds into his understanding.

The fourth basic assumption gives him a tool for understanding and naming states of cohesionlessness, isolation, and fusion in the group. Kaës’ concepts help the analyst to hear the collective unconscious of the group: the unconscious alliances that regulate what may and may not be said;

the pacts of denial that systematically exclude certain topics from language and thought; the associative chains that point beyond the individual to a common psychic current. He sharpens the perception of what functions as an apparatus in the group—beyond the individuals who populate it.

Both theories are also fruitful for thinking about institutions: about the unconscious dynamics of clinics, teams, supervision groups, and training institutions. Kaës has elaborated on this in particular in his theory of the institutional dimension.

VI. Conclusion: A joint obituary

Earl Hopper and René Kaës have fundamentally enriched thinking about groups from different angles. It would be tempting to synthesize their theories into a comprehensive metatheory—Hopper’s social unconscious and Kaës’ psychic group apparatus. Such a synthesis might show that the social and the psychic, the external world and the internal world of the group, are neither identical nor unconnected—they are intertwined, interdependent, dialectical.

Both theories suggest that the group is a transitive space: a space where the individual and the collective, the past and the present, the traumatic and the creative meet. This space requires analysts to pay special attention and to have a special negative capacity—the willingness to endure not understanding while meaning slowly unfolds.

With Hopper and Kaës, the world of group analysis loses two voices that will be difficult to replace. But their work remains—as a challenge, as an invitation to continue thinking, as a living tradition.

Selected literature

Earl Hopper

Hopper, E. (1981). Social Mobility. Oxford: Blackwell.

Hopper, E. (1991). Encapsulation as a defense against the fear of annihilation. International Journal of Psychoanalysis, 72, 607–624.

Hopper, E. (2003). Traumatic Experience in the Unconscious Life of Groups: The Fourth Basic Assumption – Incohesion: Aggregation/Massification. London: Jessica Kingsley.

Hopper, E. (2003). The Social Unconscious: Selected Papers. London: Jessica Kingsley.

Hopper, E., & Weinberg, H. (Eds.) (2011). The Social Unconscious in Persons, Groups, and Societies, Vol. 1. London: Karnac.

Hopper, E., & Weinberg, H. (Eds.) (2016). The Social Unconscious in Persons, Groups, and Societies, Vol. 2. London: Karnac.

Hopper, E. (Ed.) (2023). The Tripartite Matrix in the Developing Theory and Expanding Practice of Group Analysis. London: Routledge.

René Kaës

Kaës, R. (1976). L’appareil psychique groupal. Paris: Dunod. [dt. Übers.: Der Gruppenapparat. Wien: Passagen, 1994]

Kaës, R. (1993). Le groupe et le sujet du groupe. Paris: Dunod.

Kaës, R. (1994). La parole et le lien: Les processus associatifs dans les groupes. Paris: Dunod.

Kaës, R. (1999). Les théories psychanalytiques du groupe. Paris: PUF.

Kaës, R. (2007). Un singulier pluriel: La psychanalyse à l’épreuve du groupe. Paris: Dunod.

Kaës, R. (2008). Le complexe fraternel. Paris: Dunod.

Kaës, R. (2009). Les alliances inconscientes. Paris: Dunod.

Kaës, R. (2015). L’extension de la psychanalyse. Pour une métapsychologie de troisième type. Paris: Dunod.

References

Bion, W.R. (1961). Experiences in Groups. London: Tavistock.

Anzieu, D. (1984). Le groupe et l’inconscient. Paris: Dunod.

Anzieu, D. (1985). Le Moi-peau. Paris: Dunod.

Foulkes, S.H. (1948). Introduction to Group-Analytic Psychotherapy. London: Heinemann.

Freud, S. (1921). Massenpsychologie und Ich-Analyse. GW XIII. Frankfurt: Fischer.

Freud, S. (1912–13). Totem und Tabu. GW IX. Frankfurt: Fischer.