It is comprised of five dimensions (avolition, alogia
, anhedonia, asociality and diminished emotional range) although a total score can be used.
Severity of positive symptoms (hallucinations, delusions, bizarre behaviour, and positive formal thought disorder) and negative symptoms (affect disturbances, alogia
, avolition, anhedonia, and attention) of schizophrenia was assessed using the Scale for Assessment of Positive Symptoms (SAPS) (29) and Scale for Assessment of Negative Symptoms (SANS).
En efecto, tanto los pacientes con sintomas negativos (alogia
, abulia, aplanamiento afectivo, aislamiento social) como positivos (ideas delirantes, alucinaciones auditivas, desorganizacion del pensamiento y la conducta) deberian mostrar rendimientos deficientes en las tareas de TdM, tipicamente en pruebas de falsa creencia de primer y segundo orden (11,12).
Schizophrenia is a psychotic disorder of unknown ethiology, characterised by positive symptoms (delirium, hallucinations, disorganized behavior) and negative symptoms (affective flattening, alogia
, avolition, anhedonia).
They also include restrictions on the intensity of emotional expression (affective flattening), on the fluency and productivity of thought and language (alogia
) and on the initiation of goal-directed behavior (apathy) [5-8].
Kohler et al demonstrated that emotion recognition deficits were significantly correlated with alogia
.  Schneider et al suggested that different aspects of emotional behaviour were impaired in subtypes of schizophrenia, and it may be meaningful to compare emotional deficits in different subgroups of patients with schizophrenia.
Positive symptoms include delusions, hallucinations, disorganised speech and thoughts while negative symptoms are alogia
, avolition and asociality1.
Negative symptoms of schizophrenia include affective flattening, alogia
, avolition, and anhedonia.
The negative symptoms are classified in 5 subscales: anhedonia, avolition, affective blunting, social isolation, and alogia
. (5) Primary negative symptoms are often referred to as the deficit syndrome.
affective flattering, alogia
, or avolition (Coyle, 2006).