Fish's Clinical Psychopathology: Signs and Symptoms in Psychiatry - Exhaustive Study Notes
Foundations of Psychiatric Classification
Psychopathology is defined as the science and study of psychological and psychiatric symptoms. Clinical psychopathology specifically applies this study within the clinical context where psychiatrists perform diagnostic assessments and deliver mental health services. A definitive classification of any disease must ideally be based on its aetiology; however, in psychiatry, a pragmatic approach is adopted because the causes of many mental illnesses remain unknown. In medicine, syndromes—constellations of symptoms that are unique as a group—often exist long before their aetiology is identified. A syndrome may contain symptoms shared with other syndromes, but its particular combination makes it specific. Frank Fish illustrates the progression from symptom to syndrome to disease using Korsakoff’s syndrome: it began with observations of confabulation and impressionability in alcoholics, evolved into a recognized syndrome including disorientation, euphoria, and registration difficulties, and was finally confirmed as a disease upon the discovery of severe damage to the mammillary bodies in the brain.
Modern psychiatric classification typically distinguishes between organic and functional states. Organic syndromes arise from identifiable brain diseases, whereas functional syndromes (like schizophrenia or manic depression) have no readily apparent coarse brain disease, though cellular-level or neurobiological abnormalities are increasingly recognized. Symptoms are also categorized as primary—the immediate result of a disease process—or secondary, which represent a psychological elaboration of or reaction to primary symptoms. The term primary also describes symptoms that cannot be derived from any other psychological event. Functional disorders were historically divided into neuroses (where the patient has insight, reality testing is intact, and only part of the personality is involved) and psychoses (where the patient lacks insight and personality is distorted), though modern manuals like DSM-5 have largely moved away from the term 'neurosis'.
Organic and Functional Syndromes
Organic brain disorders are classified into acute, subacute, and chronic states. Acute organic syndromes often feature alterations of consciousness, such as delirium, which is characterized by a dream-like change in awareness where the patient cannot distinguish mental images from perceptions, often resulting in hallucinations, illusions, and severe anxiety. Subacute delirium is a transitional state between delirium and organic stupor, marked by bewilderment, incoherence, and fluctuating awareness that is usually worse at night. In twilight states, consciousness is restricted; the mind is dominated by a narrow group of ideas or images, yet the patient may appear well-ordered and perform complex actions. Chronic organic states include dementias—both generalized (e.g., Alzheimer's, Lewy body disease) and focal. Frontal lobe dementia (or frontal lobe syndrome) is associated with a lack of drive, inability to plan, and Witzelsucht—a state of happy-go-lucky carelessness and facetious humor.
Functional syndromes encompass psychogenic reactions, which are reversible, prolonged psychological responses to trauma determined by the patient’s personality and cultural factors. These include acute and transient psychotic disorders. Historically, the English-speaking world separated neuroses from personality disorders, while German-speaking psychiatry, influenced by Schneider, viewed neuroses as reactions of abnormal personalities to stress. Modern research diagnostic criteria have led to the creation of standardized interview schedules like the Structured Clinical Interview for DSM-5 (SCID-5), the Composite International Diagnostic Interview (CIDI) for lay interviewers, and the Schedules for Clinical Assessment in Neuropsychiatry (SCAN), which provides the 'gold standard' for symptom rating by mental health professionals.
Philosophical and Clinical Perspectives on Psychopathology
Karl Jaspers, the father of psychopathology, argued that mental illness should be evaluated by the form (the nature of the phenomenon, like a primary delusion) rather than the content (the specific theme, like persecution). He distinguished between autochthonous or primary delusions, which arise from biological processes, and secondary delusions, which arise as explanations for other symptoms like hallucinations. There are three primary philosophical approaches to identifying psychiatric disorders: Realism (mental illnesses exist like biological entities), Constructivism (disorders are products of social convention), and Pragmatism (classification is based on utility and what works clinically).
Validity in psychiatric software involves distinguishing normal from abnormal states and one disorder from another. The clinical significance criterion requires that a disturbance causes significant distress or impairment to be considered a disorder, preventing 'false positives' like diagnosing normal grief as major depression. The distress-impairment criterion helps delineate conditions; for example, auditory hallucinations in non-clinical populations are not considered disorders because they lack distressing quality or functional impact. Diagnosis is also complicated by co-morbidity (two unrelated entities), consanguinity (overlapping symptoms from the same entity, such as anxiety in schizophrenia), and co-occurrence (uncertain relationships between symptoms).
Disorders of Perception
Disorders of perception are categorized into sensory distortions and sensory deceptions. Sensory distortions involve a real perceptual object that is perceived in a distorted way. Changes in intensity include hyperaesthesia (magnified sensations seen in anxiety, mania, or drug use) and hypoaesthesia (sensations that look black or taste bland, seen in depression or delirium). Changes in quality include xanthopsia (yellow), chloropsia (green), and erythropsia (red) tints, often drug-induced. Spatial form distortions, or dysmegalopsia, include micropsia (objects appearing smaller) and macropsia/megalopsia (objects appearing larger). Metamorphosia refers to objects appearing irregular in shape.
Sensory deceptions include illusions and hallucinations. Illusions are misinterpretations of external stimuli and are divided into completion illusions (reading a word as finished due to inattention), affect illusions (seeing a deceased person during grief), and pareidolia (seeing vivid pictures in fire or clouds without effort). Hallucinations are defined as perceptions without an object. Pseudo-hallucinations, a concept defined by Jaspers, are vivid mental images that appear in internal (subjective) space and are recognized by the patient as coming from within, yet they are involuntary. True hallucinations appear in objective space and carry the same substantiality as real perceptions.
Specific types of hallucinations include Auditory (phonemes), which can be elementary noises or complex voices. Schneider’s first-rank symptoms include voices speaking in the third person or giving a running commentary. Gedankenlautwerden (thought sonorisation) is hearing one’s thoughts spoken aloud just before or as they occur, whereas écho de la pensée is hearing them after. Visual hallucinations are common in acute organic states; Lilliputian hallucinations feature tiny, amusing people. Olfactory (phantosmia) and Gustatory (phantaguesia) hallucinations often co-occur. Tactile (haptic) hallucinations include formication (the sensation of insects crawling, such as in the 'cocaine bug'). Functional hallucinations require a real sensation to occur simultaneously (hearing God's voice only while a clock ticks), while reflex hallucinations occur when a stimulus in one sensory field produces a hallucination in another. Autoscopy is the phantom mirror-image experience of seeing oneself.
Disorders of Thought and Speech
Intelligence is measured using tests where the mean IQ is set at $100$ with a standard deviation of $15$. Intellectual disability is categorized by IQ: borderline (), mild (), moderate (), severe (), and profound (). Thought disorders affect tempo, continuity, possession, and content. Thought tempo issues include flight of ideas (rapid, chance-linked associations), inhibition/slowing (seen in depression), and circumstantiality (trivial details delaying the goal). Continuity involve perseveration (persistent mental operations beyond relevance) and thought blocking (sudden arrest of thought).
Possession of thought covers obsessions (unwanted, repugnant thoughts recognized as one's own) and compulsions (obsessional motor acts). Thought alienation occurs when a patient feels thoughts are inserted, withdrawn, or broadcast by outside agencies. Delusions are false, unshakeable beliefs out of keeping with cultural background. Primary delusions include delusional mood (the sense the world is changing), delusional perception (meaning attributed to a normal object), and sudden delusional ideas. Content types include erotomania (De Clerambault’s syndrome; belief another is in love with them), Othello syndrome (morbid jealousy), Nihilistic/Cotard syndrome (belief one is dead or organs are missing), and delusions of reference. Formal thought disorder includes asyndesis (lack of connections) and over-inclusion. Schneider identified derailment (sliding to a subsidiary thought), substitution, and fusion.
Speech disorders include mutism (total loss), selective mutism, and talking past the point (Vorbeireden), where the patient shows they understand the question but gives an approximate, incorrect answer. Neologisms are new words or ordinary words used in new ways. Schizophasia, or 'word salad', is profoundly confused speech. Aphasias resulting from brain lesions include Broca’s (motor/expressive aphasia) and receptive aphasias like pure word deafness.
Disorders of Memory, Emotion, and self
Memory consists of sensory, short-term (working), and long-term types. Amnesia can be organic (e.g., retrograde from head injury) or psychogenic (e.g., dissociative fugue). Paramnesias include retrospective falsification (distorting memories based on current mood) and pseudologia fantastica (fluent, plausible lying). Recognition distortions include déjà vu (false familiarity), jamais vu (false unfamiliarity), and Capgras syndrome (belief a person is replaced by a double).
Emotion involves feeling (subjective), emotion (physiological state), mood (sustained), and affect (immediate response). Disorders include anhedonia (the inability to feel pleasure), incongruity of affect (misdirection of emotion), and blunting/flattening of affect. Self-experience disorders include depersonalisation (feeling unreal) and derealisation (world appearing flat). Motor disorders include tics, tremors, chorea, and athetosis. Catatonic signs include waxy flexibility (flexibilitas cerea), where a patient maintains an imposed posture, and negativism, where all interference is resisted. Consciousness disorders are assessed by orientation to time, place, and person, often disrupted in delirium.
Personality Disorders and Appendices
Personality disorders are maladaptive patterns recognizable by adolescence. Schneider described those with disordered personality as individuals who 'suffer or make society suffer.' ICD-11 proposes a shift toward severity ratings and trait domains: negative affectivity, detachment, dissociality, disinhibition, and anankastia. Specific syndromes in psychopathology include Charles Bonnet syndrome (visual hallucinations in the visually impaired), Munchausen’s syndrome (factitious illness), and Couvade syndrome (a male spouse experiencing pregnancy symptoms). Defence mechanisms protect the psyche and include altuism, denial, displacement (shifting emotion to a safer object), projection (attributing own impulses to others), and reaction formation (adopting the opposite of an unacceptable impulse).