Key points
- Phenomenology describes mental phenomena as the patient experiences them, without asking about causes. Classification groups disorders by observable symptoms, duration, severity and functional impairment.
- Signs are observed by the clinician; symptoms are reported by the patient; syndromes are clusters of signs and symptoms that occur together.
- Thought form (how thoughts flow) is different from thought content (what the thoughts are about). Assess both, and how far they interfere with daily life.
- A hallucination has no external stimulus; an illusion misperceives a real one; a pseudohallucination is vivid internal imagery with some insight.
- Mood is the sustained emotional state; affect is the emotion you observe in the interview.
- Psychiatric disorders have a multifactorial cause: genes, environment, neurobiochemistry and sociocultural factors.
Based on the lecture "Psychopathology" by Dr Linet Kendi, Consultant Psychiatrist and Lecturer in Psychiatry, Mount Kenya University (MBChB, M.Med Psych). Year 4 Psychiatry, Introduction to Psychopathology.
Core idea: understanding psychopathology needs three things: describing phenomena precisely (phenomenology), classifying them, and knowing how normal and abnormal mental processes differ.
Phenomenology, classification and theoretical models
| Term | Meaning |
|---|---|
| Phenomenology | The systematic study and description of mental phenomena as experienced by patients, focusing on subjective experience rather than underlying causes or mechanisms. |
| Classification | Organised systems for categorising mental disorders based on observable symptoms, duration, severity and functional impairment patterns. |
| Theoretical models | Conceptual frameworks that explain the development, maintenance and treatment of psychopathological conditions from various perspectives. |
These concepts are the foundation of psychiatric assessment. They let clinicians evaluate abnormal mental states systematically, with precision and reliability.
Normal and abnormal thoughts
| Normal thoughts | Abnormal thoughts |
|---|---|
| Goal-directed and logical | Disorganised or illogical |
| Contextually appropriate | Circumstantial or tangential |
| Flexible and adaptive | Rigid or perseverative |
| Reality-based content | Delusional or bizarre content |
| Coherent organisation | Fragmented structure |
| Appropriate emotional tone | Inappropriate affect |
Exam tip: telling normal from abnormal thinking needs careful assessment of content, form, and the degree to which the thoughts interfere with daily functioning and social relationships.
Signs, symptoms and syndromes
| What it is | Examples | |
|---|---|---|
| Signs | Objective, observable manifestations of illness detected by the clinician through examination | Psychomotor agitation, formal thought disorder, inappropriate affect |
| Symptoms | Subjective experiences reported by the patient, which cannot be directly observed | Auditory hallucinations, depressed mood, anxiety, intrusive thoughts |
| Syndromes | Clusters of signs and symptoms that consistently occur together, forming a recognisable pattern | Major depressive episode, psychotic syndrome |
Accurate diagnosis needs you to identify these systematically, understand how they relate in time, and assess their effect on psychosocial functioning.
Disorders of thought
Thought form
Structural abnormalities in how thinking is organised. They affect the organisation and flow of ideas.
- Circumstantiality
- Tangentiality
- Flight of ideas
- Thought blocking
- Loosening of associations
Thought content
Abnormalities in the substance of thoughts, which deviate from reality-based thinking.
- Delusions
- Overvalued ideas
- Phobias
- Preoccupations
Delusions
Fixed false beliefs held with absolute conviction despite contradictory evidence. They are described as bizarre or non-bizarre, with themes such as persecution, grandiosity or reference.
Obsessions
Recurrent, intrusive thoughts, images or impulses that are experienced as distressing, unwanted and difficult to control, even though the person recognises that they are irrational.
Remember: these thought disorders are core features of many psychiatric conditions. Careful assessment is what separates one diagnostic category, and one severity level, from another.
Disorders of perception
| Term | Meaning |
|---|---|
| Hallucinations | Perceptions in the absence of external stimuli, in any sensory modality. Auditory hallucinations are the most common in psychiatric disorders, particularly command voices in schizophrenia. |
| Illusions | Misperceptions of actual external stimuli. They often occur in altered consciousness, delirium or extreme emotional states, where reality testing remains partly intact. |
| Pseudohallucinations | Vivid mental imagery experienced as coming from internal sources. It lacks the external quality of true hallucinations, and the person keeps some insight into its unreality. |
In the lecture slides, delusions appear next to the perception disorders. They are a disorder of thought content, so they are listed above.
Mood and affect
| Term | Meaning |
|---|---|
| Euthymic | Normal, stable mood without significant elevation or depression. |
| Euphoric | Abnormally elevated, expansive or irritable mood; in a manic episode it lasts at least one week. |
| Irritable | Easily provoked to anger or annoyance, often accompanying mood episodes. |
| Affect assessment | Congruent, restricted, blunted or inappropriate emotional expression relative to content. |
Mood is the sustained emotional state. Affect is the immediate emotional expression observed during the clinical interview, and you assess its congruence and appropriateness.
Psychomotor behaviour and speech
| Psychomotor behaviour | Speech disorders |
|---|---|
| Normal: appropriate motor activity | Alogia: poverty of speech |
| Agitated: excessive, restless movement | Clang associations: sound-based connections |
| Retarded: slowed motor responses | Neologisms: invented words or phrases |
| Catatonic: waxy flexibility, negativism | Pressured speech: rapid, excessive talking |
| Tics: involuntary motor movements | Mutism: complete absence of speech |
These often occur together and give important diagnostic information about the underlying neuropsychiatric condition, particularly in psychotic and mood disorders.
Memory and cognition
| Memory disorders | Cognitive deficits |
|---|---|
| Confabulation | Attention impairment |
| Déjà vu phenomena | Concentration difficulties |
| Jamais vu experiences | Disorientation |
| Anterograde amnesia | Planning deficits |
| Retrograde amnesia | Executive dysfunction |
Cognitive assessment covers several domains: orientation to time, place and person, and the executive functions that are critical for independent living and for keeping to treatment.
Classification systems and aetiology
| System | What it is |
|---|---|
| DSM-5-TR | The American Psychiatric Association's diagnostic manual. It emphasises categorical diagnosis with dimensional assessments. |
| ICD-11 | The World Health Organization's international classification, for global healthcare standardisation. |
Multifactorial aetiology: psychiatric disorders result from complex interactions between genetic predisposition, environmental stressors, neurobiochemical abnormalities and sociocultural factors, so assessment must be comprehensive.
Clinical application: good psychiatric practice joins phenomenological understanding with evidence-based classification to guide an accurate diagnosis, the choice of treatment and the prognosis.
Practice questions
1. Define phenomenology. The systematic study and description of mental phenomena as experienced by patients, focusing on subjective experience rather than underlying causes or mechanisms.
2. What is the difference between a sign and a symptom? A sign is objective and observed by the clinician on examination (for example psychomotor agitation). A symptom is a subjective experience reported by the patient (for example auditory hallucinations or depressed mood).
3. What is a syndrome? A cluster of signs and symptoms that consistently occur together and form a recognisable pattern, such as a major depressive episode or a psychotic syndrome.
4. What is the difference between thought form and thought content? Thought form is the structure and flow of thinking (circumstantiality, tangentiality, flight of ideas, thought blocking, loosening of associations). Thought content is what the thoughts are about (delusions, overvalued ideas, phobias, preoccupations).
5. How does an illusion differ from a hallucination? A hallucination is a perception with no external stimulus. An illusion is a misperception of a real external stimulus.
6. What is a pseudohallucination? Vivid mental imagery experienced as coming from an internal source. It lacks the external quality of a true hallucination and the person keeps some insight into its unreality.
7. What is the difference between mood and affect? Mood is the sustained emotional state. Affect is the immediate emotional expression observed during the interview, assessed for congruence and appropriateness.
8. Who publishes DSM-5-TR and who publishes ICD-11? DSM-5-TR is published by the American Psychiatric Association. ICD-11 is the World Health Organization's international classification.
9. Name the five memory disorders in the lecture. Confabulation, déjà vu, jamais vu, anterograde amnesia and retrograde amnesia.
10. What causes psychiatric disorders? A multifactorial interaction of genetic predisposition, environmental stressors, neurobiochemical abnormalities and sociocultural factors.
Exam-style MCQs with answers and explanations
Try each question before you open the answer.
1. Which of the following is a sign rather than a symptom?
A. Auditory hallucinations
B. Depressed mood
C. Psychomotor agitation
D. Intrusive thoughts
Answer: C. Signs are observed by the clinician. Hallucinations, depressed mood, anxiety and intrusive thoughts are reported by the patient, so they are symptoms.
2. Circumstantiality, tangentiality and flight of ideas are disorders of:
A. Thought content
B. Thought form
C. Perception
D. Memory
Answer: B. They are structural abnormalities in how ideas are organised and flow. Thought content covers delusions, overvalued ideas, phobias and preoccupations.
3. A delirious patient sees a coat on a door and believes it is a person. This is:
A. A hallucination
B. An illusion
C. A pseudohallucination
D. A delusion
Answer: B. An illusion is a misperception of a real external stimulus, often in delirium or altered consciousness.
4. Vivid mental imagery felt as coming from inside, with some insight into its unreality, is:
A. A true hallucination
B. An illusion
C. A pseudohallucination
D. Confabulation
Answer: C. Pseudohallucinations lack the external quality of true hallucinations and the person keeps some insight.
5. Which statement about mood and affect is correct?
A. Mood is the immediate expression seen in the interview
B. Affect is the sustained emotional state
C. Mood is sustained; affect is the immediate expression observed in the interview
D. They mean the same thing
Answer: C. Mood is the sustained emotional state, while affect is the emotional expression you observe, assessed for congruence and appropriateness.
6. Which is the most common type of hallucination in psychiatric disorders?
A. Visual
B. Olfactory
C. Tactile
D. Auditory
Answer: D. Auditory hallucinations are the most common, particularly command voices in schizophrenia.
7. Which pair is correctly matched?
A. DSM-5-TR and the World Health Organization
B. ICD-11 and the American Psychiatric Association
C. DSM-5-TR and the American Psychiatric Association
D. ICD-11 and the Royal College of Psychiatrists
Answer: C. DSM-5-TR is the American Psychiatric Association's manual; ICD-11 is the World Health Organization's classification.
8. A fixed false belief held with absolute conviction despite contradictory evidence is a:
A. Obsession
B. Delusion
C. Phobia
D. Overvalued idea
Answer: B. Delusions can be bizarre or non-bizarre, with themes such as persecution, grandiosity or reference. An obsession is recognised as irrational by the person.
References
- Kendi L. Psychopathology. Lecture slides, Department of Psychiatry, Mount Kenya University School of Medicine.
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th ed., text revision (DSM-5-TR). 2022.
- World Health Organization. International Classification of Diseases, 11th revision (ICD-11).