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Negative symptoms are common in the prodromal and residual phases of the disease and can be severe. [25] During the first year, negative symptoms can progress, especially alogia, which may start off from a relatively low rate. Within 2 years, up to 25% of patients will have significant negative symptoms. [26] Psychotic symptoms tend to diminish ...
The three clusters became known as negative symptoms, psychotic symptoms, and disorganization symptoms. [101] Alogia, a TD traditionally classified as a negative symptom, can be separated into two types: poverty of speech content (a disorganization symptom) and poverty of speech, response latency, and thought blocking (negative symptoms). [115]
The Scale for the Assessment of Negative Symptoms (SANS) is a rating scale that mental health professionals use to measure negative symptoms in schizophrenia. Negative symptoms are those conspicuous by their absence—lack of concern for one's appearance, and lack of language and communication skills, for example. Nancy Andreasen developed the ...
Negative symptoms include apathy, avolition, alogia, anhedonia, asociality, and blunted emotional affect. Apathy is an overall lack of interest or enjoyment, which relates to the negative symptom of blunted emotional affect. Blunted emotional affect includes a lack of facial expressions, lack of intonation while speaking, and little eye contact.
Negative symptoms include reduced emotional expression, decreased motivation , and reduced spontaneous speech (poverty of speech, alogia). Individuals with this condition lack interest and spontaneity, and have the inability to feel pleasure ( anhedonia ). [ 26 ]
[6] [2] [21] [4] [7] Alogia (poverty of speech) and asociality (lack of social interest) are associated with DDM as well. [20] [7] Often however, a spectrum of DDM is defined encompassing apathy, abulia, and akinetic mutism, with apathy being the mildest form and akinetic mutism being the most severe or extreme form.
In schizophrenia, asociality is one of the main five "negative symptoms", with the others being avolition, anhedonia, reduced affect, and alogia. Due to a lack of desire to form relationships, social withdrawal is common in people with schizophrenia.
Some researchers have suggested that dopamine systems in the mesolimbic pathway may contribute to the 'positive symptoms' of schizophrenia, [1] [2] whereas problems concerning dopamine function within the mesocortical pathway may be responsible for the 'negative symptoms', such as avolition and alogia. [3]