OBJECTIVES: Patients with schizophrenia often have a concrete thinking or an impairment in abstract thinking, but there has been a limitation in quantitatively measuring this cognitive function. The aim of the current study was to investigate a deficit in abstract thinking in patients with schizophrenia using the theme identification task. METHODS: Twenty subjects with schizophrenia and 20 healthy volunteers participated in the behavioral study for theme identification. The visual stimuli were composed of a series of pictures, which contained positive or negative emotional situations. Three words, indicating a main theme of the picture, a theme-related item and a theme-unrelated item, respectively, were presented in the bottom of the pictures, and participants had to select a theme. RESULTS: The patient group selected theme words at significantly lower rate in both emotional conditions than the control group (positive, p=0.002 ; negative, p=0.001). Especially, in the negative condition, the patient group more selected theme-unrelated items than the control group (p=0.001). The rates of theme identification were inversely correlated with scores of the Social Anhedonia Scale (positive, r=-0.440, p=0.007 ; negative, r=-0.366, p=0.028). CONCLUSION: Patients with schizophrenia exhibited an impairment in abstract thinking, and it was remarkable in the negative condition. The ability to think abstractly was associated with the severity of social anhedonia. The impairment of abstract thinking may become one of the reasons for poor social functioning in socially anhedonic patients.
Anhedonia ; Humans ; Schizophrenia ; Thinking

OBJECTIVES: The dysfunctional neural networks underlying self-evaluation in schizophrenia are overlapped with the neural structures involved in emotion regulation. The purpose of this study was to investigate the influence of anhedonia on the self-evaluation attitude of patients with schizophrenia. METHODS: Twenty healthy controls and twenty patients with schizophrenia performed a self-evaluation task, presenting a pair of the face (self, familiar other, and unfamiliar other) and word (negative, neutral, and positive noun) at the same time. Participants were asked to evaluate relevance between the pairs by pressing a corresponding button. Relevance rating scores were compared between the groups and were correlated with the severity of physical and social anhedonia. RESULTS: Patients evaluated the condition of a self face with a negative word and a familiar face with a negative word to be more relevant than healthy controls. In the patient group, the scores of relevance rating in the condition of an unfamiliar other face with a negative word were positively correlated with the anhedonia scale scores (physical : r=0.486, p=0.030 ; social : r=0.499, p=0.025). There was no correlation between the self-evaluation attitude and the severity of anhedonia. CONCLUSION: Patients with schizophrenia evaluate themselves badly in only negative circumstances, and anhedonia is not related to self-evaluation, but rather other-evaluation.
Anhedonia* ; Diagnostic Self Evaluation ; Humans ; Schizophrenia*

OBJECTIVES: Anhedonia, defined as an inability to experience pleasure, has been considered to be a core feature of schizophrenia and depression. The purpose of the present study was to compare the specific characteristics of anhedonia in patients with the two illnesses by examining hedonic capacity during phased hedonic experience. METHODS: Hedonic rating tasks, using the film clips of physical and social hedonic stimuli and neutral stimuli, were performed by 29 patients with schizophrenia, 20 patients with depression, and 29 normal controls. Each task consisted of 'preview phase' with insufficient emotional information, and a subsequent 'theme phase' with sufficient emotional information. RESULTS: In normal controls, the mean hedonic score was increased in the theme phase compared with the preview phase, suggesting an appropriate augmentation of the hedonic response. In patients with schizophrenia, hedonic scores in the preview phase were comparable with those in normal controls, but showed deficient augmentation in the theme phase. In patients with depressive disorder, the range of increments in scores between the preview and theme phases was normal, but the scores themselves were lower in both phases than in the other two groups. CONCLUSION: The results indicate that patients with schizophrenia show a deficient augmentation of the hedonic response, whereas patients with depressive disorder have a pervasive lack of hedonic capacity.
Anhedonia ; Depression ; Depressive Disorder ; Humans ; Pleasure ; Schizophrenia

OBJECTIVES: Schizophrenia has been considered to be characterized by an abnormality in attention, especially in the executive control. Emotion is an important component of the executive control. The aim of this study was to investigate the influence of emotion on the executive control in patients with schizophrenia. METHODS: Participants were 20 healthy controls and 19 subjects with schizophrenia. They viewed full-color pictures selected from the International Affective Picture System. During each trial, an emotional picture, which was either positive or negative, lit up on either the left or right side. Participants were instructed to respond to the emotional valance of each stimulus by pressing a button with their left or right index finger, while ignoring its presented side. RESULTS: There was a group difference in the response time, and patients with schizophrenia exhibited an impairment in the executive control of emotional information. However, there was no difference in the response time between the emotional conditions. In the patient group, the missing rate in the positive emotional condition was correlated with the severity of social anhedonia, whereas the missing rate in the negative emotional condition was correlated with the severity of positive symptoms. CONCLUSION: Patients with schizophrenia have a deficit in the executive control of positive emotional information as well as negative emotion, but it may be due to different underlying mechanisms.
Anhedonia ; Executive Function ; Fingers ; Humans ; Reaction Time ; Schizophrenia

OBJECTIVES: Schizophrenia has been considered to be characterized by an abnormality in attention, especially in the executive control. Emotion is an important component of the executive control. The aim of this study was to investigate the influence of emotion on the executive control in patients with schizophrenia. METHODS: Participants were 20 healthy controls and 19 subjects with schizophrenia. They viewed full-color pictures selected from the International Affective Picture System. During each trial, an emotional picture, which was either positive or negative, lit up on either the left or right side. Participants were instructed to respond to the emotional valance of each stimulus by pressing a button with their left or right index finger, while ignoring its presented side. RESULTS: There was a group difference in the response time, and patients with schizophrenia exhibited an impairment in the executive control of emotional information. However, there was no difference in the response time between the emotional conditions. In the patient group, the missing rate in the positive emotional condition was correlated with the severity of social anhedonia, whereas the missing rate in the negative emotional condition was correlated with the severity of positive symptoms. CONCLUSION: Patients with schizophrenia have a deficit in the executive control of positive emotional information as well as negative emotion, but it may be due to different underlying mechanisms.
Anhedonia ; Executive Function ; Fingers ; Humans ; Reaction Time ; Schizophrenia

OBJECTIVE: Prefrontal and cerebellar abnormalities have been associated with higher cognitive deficits in schizophrenia. The current study aimed to show whether or not schizophrenic patients with fronto-cerebellar functional abnormalities show more anhedonia or ambivalence. METHODS: Regional cerebral metabolic activity was measured using fluoro-D-glucose positron emission tomography and was compared between 24 patients with chronic schizophrenia and 22 healthy normal volunteers. The existence of regional prefrontal hypofunction and regional cerebellar hyperfunction was investigated in each patient. Demographic and clinical variables including the emotional self-report scales were compared between the subgroups of the patients categorized according to the existence and the absence of the regional dysfunctions. RESULTS: Comparisons between each patient and the total normal controls revealed that 14 of the total twenty-four patients had regional hypofrontal functions, whereas 11 patients had regional hypercerebellar functions. Patients with prefrontal hypofunction showed more severe anhedonia than those without prefrontal hypofunction, whereas patients with cerebellar hyperfunction compared to those without cerebellar hyperfunction had more severe ambivalence. CONCLUSION: It seems that fronto-cerebellar abnormalities may be associated with cardinal emotional features of schizophrenia, such as anhedonia and ambivalence.
Anhedonia ; Electrons ; Humans ; Positron-Emission Tomography ; Schizophrenia ; Weights and Measures

The authors have experienced a case of organic mental disorder with bilateral frontal lobe atrophy in. a 36-year-old man. He showed negative symptoms of schizophrenia such as anhedonia, social withdrawal, flat affect, poverty of thought.
Adult ; Anhedonia ; Atrophy* ; Neurocognitive Disorders ; Frontal Lobe* ; Humans ; Poverty ; Schizophrenia*

OBJECTIVE: Although the association between low vitamin D levels and depressive symptoms has been widely reported, studies investigating the relationship between hypovitaminosis D and depressive symptomatology are scarce. METHODS: We retrospectively studied the relationship between vitamin D status and depressive symptoms in 196 patients hospitalized for a major depressive episode. RESULTS: The baseline 17-item Hamilton Depression Rating Scale total and depression factor (item 1, 2, 3, 7) scores were significantly higher in the vitamin-D-insufficiency/deficiency group than in the vitamin-D-sufficiency group. CONCLUSION: It is important to consider measuring the vitamin D levels of patients with severe and core depressive symptoms and providing vitamin D supplementation when necessary.
Anhedonia ; Depression ; Humans ; Inpatients ; Retrospective Studies ; Vitamin D ; Vitamins

OBJECTIVE: This study aimed to investigate whether aberrant tendency of noncurrent emotion was present in individuals at ultra-high risk (UHR) for psychosis and to explore its associations with various clinical profiles. METHODS: Fifty-seven individuals at UHR and 49 normal controls were enrolled. The tendency of experiencing noncurrent emotion was assessed using various noncurrent emotional self-reported formats, including trait [Neuroticism and Extraversion of the Eysenck Personality Questionnaire], hypothetical (Chapman’s Revised Physical and Social Anhedonia Scales), and retrospective [Anhedonia-Asociality Subscale of the Scale for the Assessment of Negative Symptoms (SANS)] measures. Self-related beliefs (Self-Perception Scale), clinical positive and negative symptoms (SA Positive Symptoms and SANS), psychosocial function (Global Functioning Scale: Role Function and Global Functioning Scale: Social Function) were also examined. RESULTS: Subjects at UHR for psychosis reported more trait unpleasant and less trait pleasant emotions, more hypothetical physical and social anhedonia, and more retrospective anhedonia than normal controls. In UHR, self-perception was correlated to trait unpleasant emotion and hypothetical physical and social anhedonia. Negative symptoms in UHR were associated with hypothetical physical anhedonia and retrospective anhedonia. Global social functioning was related to trait pleasant emotion, hypothetical physical and social anhedonia, and retrospective anhedonia. Neurocognitive function, positive symptoms, and global role functioning were not related with any noncurrent emotional experience measures in UHR. CONCLUSION: These findings suggest that the aberrant tendency of noncurrent emotional experience may be present at the ‘putative’ prodromal phase and are grossly associated with self-related beliefs and psychosocial functioning but not neurocognitive functioning.
Anhedonia ; Extraversion (Psychology) ; Psychotic Disorders* ; Retrospective Studies ; Self Concept

OBJECTIVES: Decision-making in patients with schizophrenia has been known to be inefficient in both cognitive and affective aspects. The purpose of this study was to investigate the influence of anhedonia and self-esteem on the decision-making process in schizophrenia. METHODS: Twenty patients with schizophrenia and 21 healthy controls performed the ‘apparel purchase decision-making task’, during which they were asked to respond to the preference, fitness, and price suitability, before making the final purchase decision. Generalized estimating equation and correlation analysis were conducted to explore for the difference of decision making patterns and influential factors between the two groups. RESULTS: The patients showed lower odds ratio (OR) of the fitness on the apparel purchase decision than the controls [OR 0.190 ; 95% confidence interval (CI) 0.047–0.762, p = 0.019). In the patient group, there was no correlation between the number of purchased trials and the severity of anhedonia, but the number of purchased trials was negatively correlated with the Rosenberg Self-Esteem Scale score at a trend level (R = -0.436, p = 0.055). CONCLUSIONS: Patients with schizophrenia considered the fitness of clothes less than healthy controls on apparel purchasing decisions. Schizophrenia patients with lower self-esteem were intended to buy more clothes.
Anhedonia* ; Clothing ; Decision Making ; Humans ; Odds Ratio ; Schizophrenia*