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Group psychotherapy or group therapy is a form of psychotherapy in which one or more therapists treat a small group of clients together as a group. The term can legitimately refer to any form of psychotherapy when delivered in a group format, including Cognitive behavioural therapy or Interpersonal therapy, but it is usually applied to psychodynamic group therapy where the group context and group process is explicitly utilised as a mechanism of change by developing, exploring and examining interpersonal relationships within the group.
The broader concept of group therapy can be taken to include any helping process that takes place in a group, including support groups, skills training groups (such as anger management, mindfulness, relaxation training or social skills training), and psycho-education groups. The differences between psychodynamic groups, activity groups, support groups, problem-solving and psycoeducational groups are discussed by Montgomery (2002). Other, more specialised forms of group therapy would include non-verbal expressive therapies such as art therapy, dance therapy, or music therapy.
The founders of group psychotherapy in the USA were Joseph H. Pratt, Trigant Burrow and Paul Schilder. All three of them were active and working at the East Coast in the first half of the 20th century. After World War II, group psychotherapy was further developed by Jacob L. Moreno, Samuel Slavson, Hyman Spotnitz, Irvin Yalom, and Lou Ormont. Yalom's approach to group therapy has been very influential not only in the USA but across the world. An early development in group therapy the T-group or training group (sometimes also referred to as sensitivity-training group, human relations training group or encounter group) is a form of group psychotherapy where participants themselves (typically, between eight and 15 people) learn about themselves (and about small group processes in general) through their interaction with each other. They use feedback, problem solving, and role play to gain insights into themselves, others, and groups. It was pioneered in the mid-1940s by Kurt Lewin and Carl Rogers and his colleagues as a method of learning about human behavior in what became The National Training Laboratories (now NTL Institute) that was created by the Office of Naval Research and the National Education Association in Bethel, Maine, in 1947 Moreno developed a specific and highly structured form of group therapy known as Psychodrama. Another recent development in the theory and method of group psychotherapy based on an integration of systems thinking is Yvonne Agazarian's "systems-Centered" approach (SCT), which sees groups functioning within the principles of system dynamics. Her method of "functional subgrouping" introduces a method of organizing group communication so it is less likely to react counterproductively to differences. SCT also emphasizes the need to recognize the phases of group development and the defenses related to each phase in order to best make sense and influence group dynamics.
In the United Kingdom group psychotherapy initially developed independently, with pioneers S. H. Foulkes and Wilfred Bion using group therapy as an approach to treating combat fatigue in the Second World War. Foulkes and Bion were psychoanalysts and incorporated psychoanalysis into group therapy by recognising that transference can arise not only between group members and the therapist but also among group members. Furthermore the psychoanalytic concept of the unconscious was extended with a recognition of a group unconscious, in which the unconscious processes of group members could be acted out in the form of irrational processes in group sessions. Foulkes developed the model known as Group Analysis and the Institute of Group Analysis, while Bion was influential in the development of group therapy at the Tavistock Clinic.
Bion's approach is comparable to Social Therapy, first developed in the United States in the late 1970s by Lois Holzman and Fred Newman, which is a group therapy in which practitioners relate to the group, not its individuals, as the fundamental unit of development. The task of the group is to "build the group" rather than focus on problem solving or "fixing" individuals.
In Argentina an independent school of group analysis stemmed from the work and teachings of Swiss-born Argentine psychoanalyst Enrique Pichon-Riviere. This thinker conceived of a group-centered approach which, although not directly influenced by Foulkes' work, was fully compatible with it. 
Yalom's therapeutic factors (originally termed curative factors but renamed therapeutic factors in the 5th edition of 'The Theory and Practice of Group Psychotherapy').
Group therapy can form part of the therapeutic milieu of a psychiatric in-patient unit or ambulatory psychiatric Partial hospitalization (also known as Day Hospital treatment). In addition to classical "talking" therapy, group therapy in an institutional setting can also include group-based expressive therapies such as drama therapy, psychodrama, art therapy, and non-verbal types of therapy such as music therapy and dance/movement therapy. Group psychotherapy is a key component of Milieu Therapy in a Therapeutic Community. The total environment or milieu is regarded as the medium of therapy, all interactions and activities regarded as potentially therapeutic and are subject to exploration and interpretation, and are explored in daily or weekly community meetings. However, interactions between the culture of group psychotherapeutic settings and the more managerial norms of external authorities may create 'organizational turbulence' which can critically undermine a group's ability to maintain a safe yet challenging 'formative space'. Academics at the University of Oxford studied the inter-organizational dynamics of a national democratic therapeutic community over a period of four years; they found external steering by authorities eroded the community's therapeutic model, produced a crisis, and led to an intractable conflict which resulted in the community's closure.
A form of group therapy has been reported to be effective in psychotic adolescents and recovering addicts. Projective psychotherapy uses an outside text such as a novel or motion picture to provide a "stable delusion" for the former cohort and a safe focus for repressed and suppressed emotions or thoughts in the latter. Patient groups read a novel or collectively view a film. They then participate collectively in the discussion of plot, character motivation and author motivation. In the case of films, sound track, cinematography and background are also discussed and processed. Under the guidance of the therapist, defense mechanisms are bypassed by the use of signifiers and semiotic processes. The focus remains on the text rather than on personal issues. It was popularized in the science fiction novel, Red Orc's Rage.
Group therapy is now often utilized in private practice settings (Gardenswartz, 2009, Los Angeles, CA).
Group-analysis has become widespread in Europe, and especially the United Kingdom, where it has become the most common form of group psychotherapy. Interest from Australia, the former Soviet Union and the African continent is also growing.
There is clear evidence for the effectiveness of group psychotherapy for depression: a meta-analysis of 48 studies showed an overall effect size of 1.03, which is clinically highly significant. Similarly, a meta-analysis of five studies of group psychotherapy for adult sexual abuse survivors showed moderate to strong effect sizes, and there is also good evidence for effectiveness with chronic traumatic stress in war veterans. There is less robust evidence of good outcomes for patients with borderline personality disorder, with some studies showing only small to moderate effect sizes. The authors comment that these poor outcomes might reflect a need for additional support for some patients, in addition to the group therapy. This is borne out by the impressive results obtained using Mentalization based treatment, a model that combines dynamic group psychotherapy with individual psychotherapy and case management. Most outcome research is carried out using time-limited therapy with diagnostically homogenous groups. However, long-term intensive interactional group psychotherapy assumes diverse and diagnostically heterogeneous group membership, and an open-ended time scale for therapy. Good outcomes have also been demonstrated for this form of group therapy. Group Therapy has been shown to be as or more effective than individual therapy for higher functioning adults (Gardenswartz, 2009, Los Angeles, CA). Clinical cases has shown that the combination of both individual and group therapy is most beneficial for such clients. (the "multiplicative" effect).
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