Social construction of schizophrenia

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Social Constructionism, a branch of sociology, queries commonly held views on the nature of reality, touching on themes of normality and abnormality within the context of power and oppression in societal structures. The concept of a social construction of schizophrenia, within a social construction of health and illness notary form, denotes that the label of 'schizophrenia' is one that has been socially constructed through ideological systems, none of which are truly empirical especially as currently there is no definitive evidence as to the cause(s) of schizophrenia.

Introduction[edit]

In 1966, Berger and Luckman coined the term 'social constructionism' in their seminal work 'The Social Construction of Reality'. In summary it examines the basis of fact and truth / knowledge within culture. Whilst some 'truths' such as 'fire is hot' are universally agreed as objective, many others considered 'fact' are the result of a common subjective experience and the subsequent validation of that.

Schizophrenia is one such term that can be viewed as a social construction. Walker has argued that psychiatric diagnoses are nothing but linguistic abstractions. He has criticized the DSM-IV's poor reliability and postulated that terms like 'schizophrenia' and 'mental illness' only exist by consensus and persist by convention. Further he argues that the pathologizing language which persists in the medical model of disability is unuseful in working towards a recovery model. [1]

Other notable practitioners and authors within the humanistic tradition that have viewed schizophrenia as a social construction include psychiatrist Thomas Szasz (1920-2012), Joseph Berke, R.D. Laing and Mary Barnes. Szasz viewed the diagnoses as a fabrication that is borderline abusive in terms of treatment. Szasz has protested against the taxonomic classifications of mental illness and reification of these as 'science' and has long argued against institutionalisation as a fundamental deprivation of liberty. In Joseph Berke's and Mary Barne's book: "two accounts of a journey through madness", Berke explores themes of psychosis as an enriching experience. Berke argues that the invalidation of schizophrenic experiences labelled 'sick or mad' is a uniquely western standpoint insofar as dream states and altered perception are not considered valid modes of interpolation of the truth within westernised culture.[2]

Laing (1964) commented “the mad things done and said by the schizophrenic will remain essentially a closed book if one does not understand their existential context”.[3]

Noll (1983) has explored the links between shamanism and schizophrenia, testing the research evidence on shamanism against the DSM-III diagnostic criterion. Though he draws comparisons between the two states of mind in terms of the phenomenon experienced, he draws out important differences between shamanic and schizophrenic states, notably that many people on the schizophrenic spectrum do not voluntarily enter an altered state of consciousness whereas research into shamanism unilaterally shows that shamanic states are induced and controlled voluntarily by the shaman, who ultimately maintains a healthy world view between a base line level of consciousness and an altered state of consciousness. He concludes that differences between schizophrenic and shamanic states such as 'volition', means that the DSM-III cannot be used to define shamanism as the same state as schizophrenia.[4] Robert Sapolsky has theorized that shamanism is practiced by schizotypal individuals rather than schizophrenics.[5]

Themes[edit]

Philosophy[edit]

Themes in social constructionism draw on various philosophies centred around the differences between objective reality or that which is known or absolute and subjective reality or that which is observed by the knower . In "Schizophrenia: A scientific delusion", Mary Boyle explores 'schizophrenia and its assumptions as truths or knowledges which are socially produced and managed'.[6]

Linguistics[edit]

Michael Walker examines the social construction of mental illness and it's implications for the recovery model. He is critical of the user becoming defined by the definer, such as if you go for behavioural therapy you come out with a perspective of rewards and punishments etc.:

"Psychology, like psychiatry, has found ways of linguistically contorting, convoluting, and confusing lived experience with essential “truths” of its own. Bill O'Hanlon, a preeminent postmodern consultant and author, uses his holiday cookie making experience to communicate what happens in the therapy room (O'Hanlon and Wiener-Davis, 1989). A client's problem that s/he brings to therapy is like cookie dough. The experience of it is vague and malleable. Once the "blob" of cookie dough is forced through the cookie press (a tube, funnel, and mold pressed against a baking pan) it becomes a Christmas tree, star, or Santa Claus. Similarly, when a client exposes his or her problem to a therapist it gets "molded" or interpreted in the language of the therapist. So a client attending a psychodynamic therapy session would leave having unresolved childhood conflicts. The same client leaving a behaviorist's office would walk away with problem behavior shaped by reward and punishment. An interaction with a Jungian therapist would result in the need to deal with the various archetypes that apply to him or her. Talking with a diagnostically (and thereby pathologically) minded clinician will leave one with the idea that they “have” “bipolar disorder”, “depression”, “obsessive compulsive disorder”, a “mental illness” – along with all the stories that go with them (“chemical imbalances”, life-long duration, the need to “comply” with a treatment regimen, etc.). Like cookies, continued exposure to the "heat" of the theoretical lens causes these interpretations to "harden" or "reify" (to make real)." O'Hanlon concludes that if our languaging creates “the problem” then why not leverage the use of language and create a problem that is easiest to solve.[7]

He is critical of a deficit based vocabulary:

"From the perspective of linguistics we see that the reified categories (e.g. mental illness, schizophrenia, bipolar disorder) are abstractions defined by clusters of what we call “symptoms.” Schizophrenia is defined as the presence of audio hallucinations (or other “thought disorders”) in the absence of a “mood disorder.” You can even throw in other correlates like “negative symptoms”, PET scans, response to medications, etc. The issue of the DSM's poor reliability and validity aside (Caplan, 1995; Sparks, Duncan, & Miller, 2005), the term “schizophrenia” is a word used to communicate the presence of these “symptoms.” The various human manifestations of thought, feeling, and behavior (aka “symptoms”) exist like the chair you are sitting on as you read this exists. But the next level of abstraction, the word “schizophrenia”, and the next, “mental illness”, only exist through consensus and only persist by convention. Even if the correlations of defining symptoms was perfect (which it is far from), in light of the linguistic paradigm we have to ask ourselves whether using a pathologizing, deficit-based vocabulary is useful in helping people improve the quality of their lives."[8]

Power and control[edit]

Post Structuralist Jürgen Habermas examines questions of identity in the concept of societal integration and discusses how change occurs when there is a legitimation crisis. It assists the understanding of the social construction of schizophrenia and other illness in also understanding forces that shape power imbalances in aetiologies. Phil Brown in 'Naming and Framing : The social construction of diagnosis and illness' points out how professionals were very slow and unwilling to accept the diagnosis of 'Tardive dyskinesia', despite many research indicated warnings on it, as it was iatrogenic (caused by) prescription drugs that had been plaudited to be successful in treatment of the associated condition of psychoses. Market forces in pharmacology and/or cultural embarrassment can shape the rate at which society adapts to include new frameworks such as those demonstrated in the Diagnostic and Statistical Manual of Mental Disorders. [9]

Conrad writes on medicalization and social control. He looks at the process of science and medicalization . Science is heralded as the new religion in terms of ideological power and Conrad describes how medicalization can be used to police morals.[10]

In "The social construction of illness , key insights and policy implications" , Conrad and Barker trace the history of the construction of illness from symbolic interactionists and medical sociologists and examine how society reacts in situations to the distinctions such as the construction of gender from sex and the construction of illness from disease :

"Framing anger in women as evidence of the disease PMS, to be treated with antidepressants, trivializes the impact of gender inequality on women’s daily lives. And when difficulties in children’s attention and behavior get defined as attention deficit hyperactivity disorder (ADHD), school policies increasingly encourage the use of medication and special accommodations for learning disabled students; yet these responses fail to address the social and nonmedical causes of children’s classroom inattention or agitation, such as increasing class size or the termination of physical education programs (Conrad 1975). In each case, and many others, the process by which human problems become medicalized in the first place is largely ignored in creating policy toward these issues. A social constructionist approach provides a means of understanding how such problems come to be defined in medical terms and how this translates into public policy (see Gusfield 1981). As the above examples attest, medicalized constructions can also be strongly evaluative (i.e., they suggest how people ought to behave) and result in policies that authorize social control." [11]

They conclude that in an information age . new social groupings emerging may challenge the social constructions of illness and force policy changes.

Foucault examines power systems that incur on the operation of institutions and professionals:

“The first task of the doctor is ... political: the struggle against disease must begin with a war against bad government." Man will be totally and definitively cured only if he is first liberated...” [12]

The UK parliament in a key issues statement for 2015 references a 1957 statement by the royal commission but queries it's impact some 60 years later :

“Most people are coming to regard mental illness and disability in much the same way as physical illness and disability” (Report of the Royal Commission on the law relating to mental illness and mental deficiency, 1957)

"Anti-stigma campaigns and the growing profile of mental health issues in recent years appear to have gone some way to changing views and dispelling misconceptions about mental illness. But with nine in ten people with mental health problems still experiencing stigma and discrimination, nearly sixty years after the Royal Commission’s optimistic assessment, there may still be some way to go in changing public attitudes".[13]

Certain oppressions in the UK were removed by the Mental Health (Discrimination) Act 2013

The Self and Identity[edit]

Research directions here are on the importance of experiential narrative within psychiatric dialogue. Some research is critical of modern psychiatric adoption of an 'empiricist-behavioural approach' within the DSM. Nelson, Yung, Bechdolf and McGorry examine this in context of a phenomonological approach to the understanding of ultra high risk psychiatric disorders. They criticize psychiatric research that addresses subjectivity:

"When attempts have been made to address subjectivity, the psychiatric researcher is left without the requisite conceptual tools. Instead, this form of research has tended to live out Abraham Maslow’s statement ‘‘If the only tool you have is a hammer, you tend to treat everything as if it were a nail.’’ That is, the subjective has been approached in operational terms..." [14]

'Mad Studies' is an emerging field of study wherein the user movement seeks to reclaim words such as mad and loony and redefine how psychiatry envisages the concept of madness , refuting where user experiences have been co-opted into psychiatric definitions . Mad Studies provides a construct whereby people with 'negative' mental health seek to be identified as part of the neuro-diversity of the human race. “We write at a time when activist concepts such as recovery, inclusion, access and hope have been co-opted, appropriated and politically neutralised by policy-makers, service-providers and government (Costa 2009; McWade 2014; Morgan 2013). User-led services and organisations continue to be most severely affected by spending cuts (Morris 2011), whilst anti-stigma campaigns endorsed by the Royal College of Psychiatrists continue to be pumped with millions of pounds to sell a sanitised version of ‘mental health’ to the masses (Armstrong 2014). Personalisation has been implemented through a free market ideology that has seen the dispossession and even some deaths of disabled people. It is ‘time to talk’, and not in the way the establishment wants us to, with individualised and neatly packaged tales of recovery. Instead, let us build upon the rich histories of activism and bring our shared experiences of oppression and marginalisation together” [15]

A simple way of looking at it is a slogan adopted by self-advocates 'nothing about us , without us' , encouraging educators to co-teach with people who have lived experience of mental illness or distress. A key concept in this ontolology is the idea of san[e]ism – a sixth structural oppression to go alongside those associated with race , gender , disability , age and class. It is also defined as Mentalism (discrimination) : “From where we stand , san[e]ism is a devestating form of oppression , often leading to negative stereotyping, discrimination, or arguments that Mad individuals are not fit for professional practice or , indeed, for life (Poole et al., 2012). according to Kalinowski and risser (2005), sane[e]ism also allows for a binary that separates people into a power-up group and a power-down group. The power-up group is assumed to be normal , healthy and capable. The power-down group is assumed to be sick,disabled,unreliable, and , possibly violent. This factional splitting ensures a lower standard of service for the power-down group and allows the power-up group to judge, reframe and belittle the power-down group in pathological terms”[16]

Movement to reconstruct Schizophrenia[edit]

'Alternative Perception' is one of several names suggested by the schizophrenic user movement to replace the term schizophrenia which is on a spectrum of psychotic disorders[17] and is considered to be outmoded by many consumers of services. Several leading academic authorities, notably Professor Marius Romme founder and principle theorist for the Hearing Voices Movement provide a rationale for the abandonment of this label. A symposium of some of the leading notions in this field from consumers of services and academics concluded:

We are calling for the label of schizophrenia to be abolished as a concept because it is unscientific, stigmatising, and does not address the root causes of serious mental distress. The CASL campaign is driven by two central factors. The concept of schizophrenia is unscientific and has outlived any usefulness it may once have claimed. The label schizophrenia is extremely damaging to those to whom it is applied.[18]

Historical construction of Schizophrenia[edit]

The Terms Schizophrenia and Autism originated from the works of Eugene Bleuler (1857–1939) as different aspects of the same diagnostic condition. Bleuler was a contemporary of Sigmund Freud and Carl Jung. Prior to Bleuler's interventions schizophrenia was referred to as Dementia praecox (early insanity) and perceived as a single disorder. Schizophrenia is sometimes also referred to as hebephrenia, stemming in etymology from the Greek god Hebe who was associated with adolescence and as it was thought the onset of schizophrenia came at adolescence. It is generally acknowledged that Schizophrenia can have early onset and late onset.

"He first advanced the term schizophrenia in 1908 in a paper based on a study of 647 Burghölzli patients. He then expanded on his paper of 1908 in Dementia Praecox oder Gruppe der Schizophrenie…Bleuler is credited with the introduction of two concepts fundamental to the analysis of schizophrenia: autism, denoting the loss of contact with reality, frequently through indulgence in bizarre fantasy; and ambivalence, denoting the coexistence of mutually exclusive contradictions within the psyche." [19]

Schizophrenia in America is a medical diagnostic category, which in the 1970s was primarily termed differentiated and undifferentiated schizophrenia; international leaders such as R.D. Laing in Europe offered professional expertise in serving this population group. In the context of community mental health services, the broad term mental health also referred to individuals who may have this diagnosis, which may or may not be considered to be valid or relevant. The word schizophrenia is often associated with a "major mental breakdown" in common parlance which may result in the need for psychotherapy, mental health counseling, person-centered therapy,[20] or community support services [21][22]

Charities committed to changing public perception[edit]

Charities that disagree with the notion of the schizophrenia label in the U.K. include Mind (charity) and Rethink. Mind state on their website "Because of differences of opinion about schizophrenia, it's not easy to identify what might cause it." Mind have previously published an explanatory leaflet, prefaced by Michael Palin that gives a definition of schizophrenia as people 'who think outside the normal range of human experience'.[23] The National Alliance on Mental Illness says:

"By changing the name, consumers with the symptoms of what actually may be a spectrum of disorders would have a more accurate and descriptive name attached to their diagnosis. Ideally, they would also experience less stigma, as they left behind a name with Greek origins that roughly translates to “shattered mind” and which is often used in popular culture to mean "multiple personality disorder" or "split personality.".[24]

Science of Schizophrenia and Comorbid Conditions[edit]

Whilst the definitive cause (s) of schizophrenia remain unknown , research has indicated strong links between genetic make-up , social predisposing factors/stressors and environmental conditions in relation to the development and onset of schizophrenia and other conditions. International geneticists are working towards identifying a gene for Schizophrenia , combined efforts are at the SzGene database. In the course of this research geneticists have identified specific genes / copy number variants / alleles that may explain the comorbidity of various conditions.

Genetic links between comorbid conditions[edit]

Chromosome 16
Ideogram of human chromosome 16

Links between autism and schizophrenia have been studied. From clinical observation, both conditions cause a disruption in normative social functioning which may be mild or severe depending on the individual's position within the spectrum. Social cognition is under-developed in autism and highly developed in psychoses. Four genetic loci are diametrically opposed in terms of diagnoses of autism and schizophrenia, with corresponding deletions for one condition or duplications for the other. Researchers examining chromosome 16 (16p11.2) identified a heredity area on the short arm of human chromosome 16 (16p11.2) which contains microduplication and microdeletion of genome variation. Microduplication of hereditary factors in this heredity area increased the individual's risk of schizophrenia more than 8–14-fold and of autism over 20-fold. A corresponding microdeletion instead of microduplication in the area affected the risk of autism only, but not of schizophrenia.[25][26][27][28] A recent study of de novo mutations, ie new mutations in people with both autism and schizophrenia spectrum conditions, concluded that schizophrenia and autism are due to "errors" during early organogenesis.[29][30]

The National Institute of Mental Health reported on 8 December 2009 that in spring 2010, major databases on autism research will be joined up to facilitate further research.[31] One study ascribes links between schizophrenia and bi-polar disorder by studying a total group of 6909 Europeans, both diagnosed and undiagnosed.[32] Another study suggests that genetic markers may be very dissimilar among different lineages of DNA in people of different cultures, making an international commonality in genetics as a precipitating factor in schizophrenia difficult to identify.[33][34]

Genetic Allelles[edit]

Other recent genetic analysis examines the role of alleles . One study ascribes links between schizophrenia and bi-polar disorder by studying a total group of 6909 Europeans , both diagnosed and undiagnosed.[35] Another study suggests that Genetic markers may be very dissimilar among different lineages of DNA in people of different cultures, making an international commonality in genetics as a precipitating factor in schizophrenia difficult to identify.[36][37]

Social Factors[edit]

A recent study published in The guardian, reported on 9 December 2009, ascribes the onset of the condition to social factors. The authors of the study which compared 500 patients with mental health problems with other ethnic groups and a control group of 350 people claim there is an epidemic of schizophrenia amongst the Afro-Caribbean community . They refute the argument that racism may contribute to more diagnoses from psychiatrists of schizophrenia amongst members of the Afro Caribbean community and ascribe more value to deprivation and social isolation as triggering factors in those with a propensity towards schizotype personalities.[38]

Chemical and Environmental factors[edit]

Various studies have indicated chemical precipitating factors in the development of autism / schizophrenia and also suggested that environmental factors such as toxins in the air may have precipitated a rise in the number of children born with autism. Ploeger discovered that Pre-natal prescribed softenon in the 60's and 70's lead to an increase of children born with autism by 4% as opposed to a usual figure of 0.1% . Sodium Valproate a drug used as an anti-epileptic and as a mood stabilizer increased the chance of children being born with autism sevenfold. The active component of cannabis (THC) is thought by some to increase the chances of onset of schizophrenia by 2.6 times in its skunk preparation. [39][40] [41] [42] [43] At this time there is no publicly available research on commonalities between these chemicals that may trigger the on/off switches in neuro-receptors linked to genes responsible for conditions on the autistic or schizophrenic spectrum.

Criticism of genetics[edit]

Critique in terms of current genetic research is that there are many candidates for copy number variants that may predispose a likelihood of developing schizophrenia but current research is flawed by both the sample sizes available for analysis by condition population and by an incomplete understanding of 'double whammies' where one allele affects another. [44] This has also been referred to as genetic 'dark matter' with the notion that many rare mutations have not yet been discovered.

Evolution[edit]

Links between Autism and Schizophrenia have been studied (as above). The implications are both conditions are part of the same spectrum. From clinical observation , both conditions cause a disruption in normative social functioning which may be mild or severe depending on the individual's position within the spectrum. Simon Fraser University researcher Crespi has examined how social cognition is under developed in Autism and highly developed in Psychoses and outlines how the relationship between Autism and Schizophrenic Spectrum is not one that has been explored in detail in the latter part of the 20th century. His research hypothesises that the genetic marker for both conditions may lie in the same location . His team have identified four loci that are diametrically opposed in terms of diagnoses of Autism and Schizophrenia with corresponding deletions for one condition or duplications for the other :

"Crespi says the work supports the hypothesis that risks of autism and schizophrenia “have evolved in conjunction with the evolution and elaboration of the human social brain.”"

Professor Timothy Crow , from the University Department of Psychiatry at Oxford University , has long argued that schizophrenia as a condition came about as a result of natural selection . He has argued that schizophrenia is a by-product of the development of language, resulting from an evolutionary change approx 150,000 years ago, that persisted due to sexual selection. However . conversely to study in polygenes or multiple allele combinations , he maintains that the answer lies in :

"the evolutionary history of the Protocadherin11XY gene pair that characterizes the hominin lineage including the 'sapiens' event that represents the transition to modern Homo sapiens." [45] [46]

The use of the RH semantic system may constitute a selective evolutionary advantage allowing the genes predisposing to schizophrenia to proliferate despite the obvious disadvantages of this devastating disease.[47]

Immunology and Schizophrenia[edit]

A strand of research into schizophrenia is to investigate the links between virus etc that attack the immune system such as Herpes and the onset of schizophrenia. Researchers in this field are hopeful that this connection may provide a cure for schizophrenia within the next 20 years.

"On the basis of the findings, perspectives for future research are outlined aiming at a precise and consequent strategy to elucidate a potential involvement of immune mechanisms in the etiopathogenesis of schizophrenia."[48]

Muller proposes that the vulnerability-stress model of analysis of schizophrenia should become the vulnerability-stress-inflammation model

"The vulnerability-stress-inflammation model is important as stress may increase proinflammatory cytokines and even contribute to a lasting proinflammatory state. The immune system itself is considered an important further piece in the puzzle, as in autoimmune disorders in general, which are always linked to three factors: genes, the environment and the immune system. Alterations of dopaminergic, serotonergic, noradrenergic and glutamatergic neurotransmission have been shown with low-level neuroinflammation and may directly be involved in the generation of schizophrenic symptoms" [49]

Research shows that viral infections of the immune system can dramatically increase the frequency of the onset of schizophrenia.

“ a large scale Danish nationwide study on 39,076 persons with a diagnosis of schizophrenia spectrum disorders showed that the history of hospitalisation with infection increased the risk of schizophrenia by 60%” [50]

Global moves to change the construction of 'Schizophrenia'[edit]

In the Netherlands alternative proposals for the name schizophrenia include 'dysfunctional perception syndrome' [51] and Salience Syndrome :

"The concept of 'salience' has the potential to make the public recognize psychosis as relating to an aspect of human mentation and experience that is universal. It is proposed to introduce, analogous to the functional-descriptive term 'Metabolic syndrome', the diagnosis of 'Salience syndrome' to replace all current diagnostic categories of psychotic disorders. Within Salience syndrome, three subcategories may be identified, based on scientific evidence of relatively valid and specific contrasts, named Salience syndrome with affective expression, Salience syndrome with developmental expression and Salience syndrome not otherwise specified."[52]

From a social model of disability perspective, this interlinks :

The human mind has the ability to turn its attention to something that is salient, something that jumps out at you. We then focus on it. In some people this function is disturbed, and everything gets an enormous significance. They think, for example, that a television programme is about them, or that people who are just walking along the street are out to harm them. Research shows that this can happen to everybody under the influence of drugs, also to healthy people. The word syndrome indicates that it is about a cluster of symptoms. And not about a clearly defined illness.[53]

In Japan "In order to contribute to reduce the stigma related to schizophrenia and to improve clinical practice in the management of the disorder, the Japanese Society of Psychiatry and Neurology changed in 2002 the old term for the disorder, "Seishin Bunretsu Byo" ("mind-split-disease"), into the new term of "Togo Shitcho Sho" ("integration disorder")…Eighty-six percent of psychiatrists in the Miyagi prefecture found the new term more suitable to inform patients of the diagnosis as well as to explain the modern concept of the disorder."[54] The Japanese society of psychiatry and neurology report : "This change is making psychoeducation much easier and is being useful to reduce misunderstandings about the illness and to decrease the stigma related to schizophrenia. The new term has been officially accepted by the Japanese medicine and media and is being adopted in the legislation in 2005."[55]

See also[edit]

External links[edit]

References[edit]

  1. ^ Walker MT (2006). "The Social Construction of Mental Illness and its Implications for the Recovery Model". International Journal of Psychosocial Rehabilitation 10 (1): 71–87. 
  2. ^ Mary Barnes; Joseph H. Berke (17 March 2002). Mary Barnes: two accounts of a journey through madness. Other Press, LLC. ISBN 978-1-59051-016-2. Retrieved 23 October 2010. 
  3. ^ Roberts GA (2000). "Narrative and severe mental illness:what place do stories have in an evidence-based world?". Advances in Psychiatric Treatment 6 (6): 432–441. doi:10.1192/apt.6.6.432. 
  4. ^ Noll, Richard. (1983). "Shamanism and Schizophrenia.A State-Specific approach to the 'Schizophrenia Metaphor of shamanic states'". American Ethnologist 10 (3): 443–459. doi:10.1525/ae.1983.10.3.02a00030. JSTOR 644263. 
  5. ^ "Dr. Robert Sapolsky's lecture about Biological Underpinnings of Religiosity" [1]
  6. ^ Boyle,M., 2002, "Schizophrenia:A Scientific Delusion"
  7. ^ Walker,Michael. (2006). "The social construction of mental illness and it's implications for the recovery model" (PDF). Internanational journal of Psychosocial Rehabilitation 10 (1): 71–87. 
  8. ^ Walker,Michael. (2006). "The social construction of mental illness and it's implications for the recovery model" (PDF). Internanational journal of Psychosocial Rehabilitation 10 (1): 71–87. 
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  12. ^ Foucault,M. , 1973, The Birth of the Clinic: An Archaeology of Medical Perception , Tavistock publications limited , available at http://monoskop.org/images/9/92/Foucault_Michel_The_Birth_of_the_Clinic_1976.pdf [accessed 14.11.15]
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