L2: Psychiatric Symptoms & Signs Flashcards
(124 cards)
Definition of perception
- The process by which sensory stimuli are given a meaning (i.e. transferring physical stimulation into psychological information).
Disorders of perception
- Illusions
- Hallucinations
- Depersonalization & Derealisation
Characters of Illusions
- May affect any sensory modality (auditory, visual, …).
- May occur in normal or pathological condition (e.g delirium).
Def of Illusions
- Misinterpretation of a real external sensory stimuli e.g.: mistaking a robe for a snake and mirage phenomenon.
Def of Hallucinations
False perception in absence of any external stimuli.
classification of hallucinations, according to complexity
Elementary:
- Hallucination are ill formed stimuli e.g. noises, flashes of light
Complex:
- Hallucination are more sophisticated and relatively meaningful stimuli e.g. voices, music, faces, scenes
what are Hallucinations classified according to?
- complexity
- Sensory modality
what is the most common type of hallucinations?
Auditory hallucination
Classification of hallucinations, according to sensory modality
- Auditory Hallucinations
- Visual hallucinations
- Tactile hallucinations
- Olfactory and Gustatory hallucinations
- Somatic hallucinations
where do Auditory hallucination mainly occur?
- They mainly occur in psychotic disorders especially schizophrenia.
Varieties of Auditory hallucination
where is visual hallucination most common?
- Most common in organic mental disorders (e.g delirium, substance intoxication or withdrawal).
- May occur in schizophrenia, severe mood disorder or dissociative disorder.
what are Tactile hallucination?
- False perception of touch e.g phantom limb (from amputated limb)
- Crawling sensation on or under the skin in cocaine intoxication or withdrawal.
where is Olfactory (smell) or gustatory (taste) hallucination most common?
- Most common in organic disorders e.g temporal lobe epilepsy.
- May occur also in: schizophrenia or severe mood disorders.
what are Somatic hallucinations?
- False sensation of things occurring in the body (mostly visceral).
Examples of Somatic hallucinations
- complaint that a snake is wondering in the abdomen and complaint of buming pain in the brain.
where do Somatic hallucinations occur?
- They usually occur in psychotic disorders especially schizophrenia.
Hallucination can occur in normal conditions such as ……
- While getting into sleep (hypnagogic).
- During awakening (hypnopompic).
- After physical stimulation of a sense organ (flashes of light after pressing the eye ball).
what is Depersonalization & Derealisation?
Disturbed perception of oneself or the surrounding environment.
Def of Depersonalization
- The person perceive himself, his body or parts of his body as different, unreal or unfamiliar.
Def of Derealization
- The person perceive the external world, objects or people as different, strange or unreal.
where do Depersonalization and derealization occur?
- Depersonalization and derealization can occur in normal person during stress, in anxiety disorders, mood disorder, schizophrenia and in organic disorders e.g. temporal lobe epilepsy.
what are disorders of thinking classified into?
- Disorders of the form of thinking
- Disorders of the stream of thinking
- Disorders of the content of thinking
Characters of Disorders of
The form of thinking
- They are also called formal thought disorders.
- They are abnormalities in the logical structure and association of thoughts.
- They lead to failure in producing coherent and logically connected meanings.
- Formal thought disorders usually occur in psychotic disorders and in organic mental disorders.