Characteristics of Schizophrenia

Schizophrenia is characterised by loss of contact with reality. Episodic = periods of more severe symptoms followed by periods of fewer/no symptoms. Your notes give an episode duration of 1-6 months, although duration varies & full recovery between episodes is not guaranteed.

Royal College of Psychiatrists (2002) = 1 in 100 people in England & Wales experience schizophrenia. NHS (2014), as cited in the notes = typical diagnosis at 15-35 yrs. The notes describe men & women as equally affected, with women diagnosed around 10-15 yrs later; these are simplified background figures rather than fixed rules.

Positive symptoms = experiences\/behaviours added to usual functioning, e.g. hallucinations, delusions & disordered thinking. Negative symptoms = reduction/loss of usual functioning, e.g. alogia, avolition, anhedonia & flatness of affect.

Hallucinations = sensory perceptions without a corresponding external stimulus, experienced as real. They may be auditory (hearing), visual (seeing) or tactile (touch). Lewandowski (2009), as cited in the notes = 20% experience tactile hallucinations. Example = formication, the sensation of bugs crawling on\/under the skin.

Delusions = firmly held false beliefs maintained despite contradictory evidence. Delusions of persecution = belief that others intend to harm/threaten the individual, creating a 'me vs them' mentality. Delusions of grandiosity = belief that the individual is unusually special/important, e.g. 'the chosen one'.

Disordered thinking = erratic, incoherent thoughts that jump between topics without clear logical links. This muddles what the individual is trying to express & may frustrate them/others. Thought insertion = belief that thoughts are foreign/not their own because an outside source has placed them in their mind.

Alogia = poverty of speech, with reduced amount/content of speech. The individual may give brief replies, elaborate very little & struggle to express their thoughts clearly.

Avolition = reduced motivation/drive to begin & maintain goal-directed behaviour. The individual may appear indifferent towards everyday activities & show little desire to participate or work towards goals.

Anhedonia = reduced ability to experience pleasure from normally enjoyable activities/experiences. This concerns pleasure, whereas avolition concerns motivation.

Flatness of affect = reduced outward expression of emotion, e.g. limited facial expressions & monotonous speech during conversation. This can make the individual appear apathetic, although reduced expression does not necessarily mean they feel no emotion internally.

Catatonic behaviour = disturbed movement\/responsiveness, ranging from rapid, irregular or repetitive activity, e.g. pacing in circles without a clear purpose, to prolonged immobility. Echopraxia = imitating other people's movements. Catatonia is a psychomotor feature; the notes group it with negative symptoms, but it is not simply a negative symptom.

DSM-5 = Diagnostic and Statistical Manual of Mental Disorders, used to classify/diagnose mental disorders & primarily associated with the USA. ICD-10 = International Classification of Diseases, covering physical & mental conditions & used internationally, including the UK. DSM-5 requires continuous signs of disturbance for at least 6 months, including an active symptom period; ICD-10 requires characteristic symptoms for most of the time for at least 1 month.

At least 1 very clear symptom from groups (a)-(d), OR symptoms from at least 2 groups (e)-(h), present for the required duration. The first grouping includes thought echo & certain delusions/characteristic auditory hallucinations. The second includes persistent hallucinations, thought disorder, catatonia & negative symptoms. It is not simply '1 positive OR 2 negative symptoms'. Thought echo = thoughts experienced as echoed aloud; neologisms = invented words associated with disorganised speech.

Prominent manic/depressive episodes may suggest another diagnosis, e.g. bipolar disorder or schizoaffective disorder. Clinicians must consider the timing & relationship between mood episodes & psychotic symptoms rather than automatically diagnosing schizophrenia.

Diagnostic criteria; lack of insight; stigma; depression/comorbidity; whether schizophrenia represents a single valid diagnostic category.

Criteria can differ between countries/classification systems & change over time, e.g. the notes contrast ICD use in the UK with DSM use in the USA. Different criteria may produce different participant samples = findings may not apply across systems/countries, limiting generalisability & external validity.

Individuals may struggle to accept their diagnosis because hallucinations/delusions feel real. Some may also struggle to articulate their beliefs = difficulty recognising/explaining how schizophrenia affects them. Ethical issue = understanding of the study & informed consent may be affected, so researchers must check ongoing understanding & voluntary participation. Diagnosis alone does not mean someone cannot consent.

Media misrepresentation can reinforce misunderstanding, stereotypes & prejudice. This may reduce research funding/support through devaluation of mental health. It may also contribute to diagnostic\/researcher bias = cultural or societal stereotypes influence interpretation, e.g. minority/non-Western behaviours are labelled pathological when cultural context is overlooked.

Comorbidity = 2 or more distinct conditions occurring together. Depression can coexist with schizophrenia & shares features with negative symptoms, e.g. reduced motivation/pleasure. Buckley et al. (2009), as cited in the notes = 50% of schizophrenia patients also have clinical depression. Symptom overlap can complicate diagnosis & confound treatment research = difficult to tell whether improvement reflects changes in schizophrenia, depression or both.

Critics question whether schizophrenia is one unified disease or a label grouping diverse symptom patterns. The notes associate R. D. Laing with the view that it is socially constructed. Research issue = participants may share a diagnosis but have very different difficulties, weakening conclusions about one common disorder. Suggested alternative = study/treat specific symptoms separately. This challenges the classification, not the reality of people's experiences/distress.