Marcus has been diagnosed with schizophrenia; his symptoms include hearing critical voices and a complete lack of energy or interest in daily activities. His sister, Chloe, has been diagnosed with obsessive-compulsive disorder (OCD), experiencing persistent thoughts about contamination and carrying out extreme, repetitive cleaning rituals. Their family doctor suggests that both siblings' conditions are primarily caused by abnormal neurotransmitter activity in their brains. However, their mother argues that since their father also had severe psychiatric problems, their conditions must be purely genetic.
Discuss biological explanations for schizophrenia and one other disorder (such as OCD). You must refer to Marcus and Chloe in your answer.
110 exam-style questions on Edexcel A Level Psychology Content, covering Diagnosis of mental disorders (4 Ds), Classification systems (DSM and ICD), Schizophrenia and one other disorder, Treatments for the two disorders, Individual differences, and Developmental psychology. Each one has a worked solution and a mark scheme showing where the marks go.