Affective valence of words, explicit and implicit memory in clinical depression

Explicit and implicit memory for affectively valenced words (positive, negative or neutral) were investigated in 30 patients suffering from a major depressive episode (DSM-III-R criteria) and 30 normal control subjects. Explicit memory was assessed with a free-recall and a recognition task and implicit memory with a word-stem completion task. Depressed and control subjects recalled more emotional, i.e., positive and negative, words than neutral ones. They recognized less negative than neutral words. In contrast, to recall and recognition performance, word-completion performance was not sensitive to the affective valence of words: depressed and control subjects exhibited equivalent priming of positive, negative and neutral words. These results indicate that, in depressed and normal subjects, the affective valence of words influences memory when conscious, intentional recollection is required but is devoid of effect when such a recollection is not required.     

Unconscious mood-congruent memory bias in depression.

The purpose of this study was to investigate an unconscious or implicit mood-congruent memory (MCM) bias in clinical depression. Many studies have shown an explicit memory bias, but no study has yet found an implicit MCM bias in clinical depression. The authors compared depressed and control group participants on a conceptually driven implicit memory test. After studying words of positive, neutral, and negative affective valences, participants produced free associations to various cues. Implicit memory or priming was demonstrated by the production of more studied than unstudied words to the association cues. Depressed participants showed more priming of negative words, whereas controls showed more priming of positive words, thus supporting the MCM pattern. Also, no implicit memory deficit was found in depressed participants. These findings are discussed in the context of several prominent theories of cognition and depression. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Explicit and implicit memory bias in panic disorder with agoraphobia

Thirty patients with a diagnosis of panic disorder with agoraphobia and 30 normal controls were compared on explicit memory (cued recall) and implicit memory (word stem completion) for positive, neutral, social threat, and physical threat words. The panic patients showed an explicit memory bias, but no implicit memory bias, for physical threat words. The index of explicit memory bias for physical threat words was found to correlate with anxiety sensitivity and degree of agoraphobic fear and avoidance. The index of baseline bias for threat words on the word completion task, on the other hand, correlated with trait anxiety. Although there were no correlations between explicit and implicit memory bias for physical threat words, explicit memory bias for physical threat words correlated with explicit memory bias indexes for positive words and social threat words. The results are discussed in terms of the functional role of an explicit memory bias for physically threatening events in panic disorder. The negative results on implicit memory bias are discussed in relation to earlier studies, the use of different implicit memory tasks, and the role of baseline bias on implicit memory tasks. Finally, the hypothesis is suggested that explicit and implicit memory bias for emotional information may represent two different styles of information processing, which serve as vulnerability factors for different emotional disorders.     

Attributional style, depression, and perceptions of consensus for events.

This study examined the differences between depressed and nondepressed individuals' implicit perceptions of consensus, which may contribute to differences in their attributional styles. Subjects rated the extent to which positive, negative, and neutral events happen to themselves and to the average college student and completed measures of depth of depression and attributional style. Perceptions of consensus were highly correlated with all components of attributional style for negative and positive events. Hierarchical regression analyses revealed that ratings of others explained variance in attributional style beyond that explained by ratings of the self for positive but not for negative events. Path analyses, however, indicated that the indirect path from perceptions of consensus to depression mediated through attributional style was nonsignificant for positive events, although it was significant for negative events. These findings are discussed in terms of the role of perceptions of others as precursors of attributional style and depression. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive Processing of Emotional Information in Depression, Panic, and Somatoform Disorder.

Emotional Stroop tasks (subliminal/supraliminal exposures), implicit memory tasks (tachistoscopic word identification), and explicit memory tasks (free recall after incidental learning) with 4 word types (physical threat, positive, negative, and neutral words) were administered to patients with major depressive disorder (n = 30), panic disorder (n = 33), somatoform disorder (n = 25), and healthy control participants (n = 33). On the Stroop task, panic patients showed subliminal interferences for physical threat and negative words, depressive patients showed supraliminal interferences for negative words, and somatoform patients showed supraliminal interferences for physical threat words. No patient groups demonstrated implicit memory biases. On the explicit memory task, depressive and panic patients showed memory biases for negative words; somatoform patients showed biases for physical threat words. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Implicit and explicit memory for shape, body weight, and food-related words in patients with anorexia nervosa and nondieting controls.

Twelve patients with anorexia nervosa and 12 control participants watched a series of 64 words. There were 4 word types: anorexia related, positive, negative, and neutral. The last 3 types were anorexia unrelated. Anorexia-related words had the same affective valence as the neutral control words. Next, the participants completed an explicit memory test ( cued recall ) and an implicit memory test (word stem completion). Results showed a strong explicit memory bias for anorexia-related words for patients with anorexia nervosa but not for nondieting controls. There was no evidence for a similar bias in implicit memory. Results are discussed in the context of cognitive biases in psychopathology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Seasonal influence on platelet 5-HT levels in patients with recurrent major depression and schizophrenia

The influence of seasons on platelet serotonin (5-HT) concentration was determined in 88 unipolar depressed and 117 schizophrenic male inpatients, and 90 normal male controls. Platelet 5-HT concentrations showed moderate, but insignificant intragroup seasonal variations in healthy controls and in the groups of depressed (psychotic and nonpsychotic) and schizophrenic (positive and negative) patients. In spring, platelet 5-HT concentrations were higher in schizophrenic patients than in normal controls or in depressed patients, while in other seasons platelet 5-HT concentrations were not significantly different between the groups. Higher platelet 5-HT concentrations were detected in psychotic when compared to nonpsychotic depressed patients in summer, fall, and winter. Increased platelet 5-HT concentrations observed in schizophrenic patients with positive symptoms clearly separated these patients from patients with negative schizophrenia, especially in spring, summer, and fall. Our results indicate the necessity to match patients with regard to the season of the sampling, and to divide depressed and schizophrenic patients into subtypes.     

Semantic habits and cognitive style processes in the deaf.

Several measures of associative patterns, cognitive styles, and attitudes toward self and others were obtained on 173 deaf adolescents and 178 normal controls. Results show reduced tendencies of the deaf to use evaluational concepts in association, but greater tendencies to devalue self and others. Deaf girls are much like deaf boys in associative and evaluational responses. Several possibilities for the study of implicit language processes in deaf and normal Ss are suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Math = male, me = female, therefore math ≠ me.

College students, especially women, demonstrated negativity toward math and science relative to arts and language on implicit measures. Group membership (being female), group identity (self = female), and gender stereotypes (math = male) were related to attitudes and identification with mathematics. Stronger implicit math = male stereotypes corresponded with more negative implicit and explicit math attitudes for women but more positive attitudes for men. Associating the self with female and math with male made it difficult for women, even women who had selected math-intensive majors, to associate math with the self. These results point to the opportunities and constraints on personal preferences that derive from membership in social groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Unipolar Depression, Life Context Vulnerabilities, and Drinking to Cope.

This study followed baseline samples of 424 unipolar depressed patients and 424 community controls across 10 years to investigate the association between depression and alcohol-related coping and to examine how life context vulnerabilities underlie the risk for depressed individuals to rely on drinking to cope. Findings supported all hypotheses. Depressed patients engaged in more drinking to cope than did community controls. Within individuals, more negative life events and less family support were associated with more drinking to cope across the 4 observations. Depressed patients experienced more negative life events and less family support than did community controls. These underlying life context vulnerabilities explained the relationship between depressed patient status and drinking to cope. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Psychosocial adjustment of adolescent children of a depressed, arthritic, or normal parent.

Examined the joint effects of having a parent with a psychological or physical disability and stressful life events on the mental health of 3 groups of adolescents: 16 adolescent children of a depressed parent, 16 adolescent children of a parent with rheumatoid arthritis, and 16 adolescent children of parents free from psychological or physical disability. Ss were asked to complete a battery of assessments, including the SCL-90, Rosenberg Self-Esteem Scale, Family Environment Scale, and scales assessing life events and satisfaction with school. It was found that, in contrast to the normal group, Ss with arthritic parents reported lower self-esteem, whereas Ss with depressed parents reported lower self-esteem and more symptomatology. However, the 2 risk groups did not differ in terms of mental health or family and school adjustment. Both negative and positive life events were strongly related to poorer adjustment, but only for Ss with depressed and arthritic parents. There was a significant interaction effect of parental disability (depressed vs normal) and negative life events on symptomatology, with the Ss with depressed parents who experienced few negative life events reporting symptom levels equivalent to that of the normal group. Within-group analyses revealed that a positive familial social climate was related to better adjustment among all 3 groups: satisfactory school involvements were related to better adjustment among the depressed-parent and normal groups. (39 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Memory for emotional trait adjectives in clinically depressed youth

An experiment was conducted to examine memory for emotional trait adjectives in depressed children and adolescents. Two groups of children and adolescents, clinically depressed participants and non-clinical controls, were compared on computerized versions of recall and recognition memory tasks. Three groups of words (positive trait adjectives, negative trait adjectives, and categorized neutral words) were used in the experiment. Results showed that the depressed group recalled significantly more negative adjectives than positive adjectives, whereas the control group recalled the same number of positive and negative adjectives. This effect was predicted by the association between age and level of depression, with the depression-related bias becoming stronger with age. Signal detection analysis revealed that the depressed group did not show any bias in the recognition task. The findings are discussed with respect to cognitive theories of depression with consideration of the developmental implications.     

Information processing and cognitive organization in unipolar depression: Specificity and comorbidity issues.

This study investigated information processing and cognitive organization in clinical depression. The specificity of various cognitive mechanisms to depression was also examined. Twenty-six depressed/anxious individuals, 24 pure depressives, 25 never-depressed anxious controls, and 25 nonpsychiatric controls completed a modified Stroop task, the Self-Referent Encoding Task, and two tasks designed to assess cognitive structure. Comorbid depressed/anxious, depressed, and anxious groups performed similarly to one another but differed significantly from nonpsychiatric controls, on the processing and organization of negative content. Specificity to depression was also obtained, as both depressed groups endorsed and recalled less positive information and organized positive self-relevant information with less interconnectedness than anxious individuals and nonpsychiatric controls. These results suggest that depressed individuals have an interconnected negative self-representational system and lack a well-organized positive template of self. These findings are discussed in terms of cognitive models of depression and the tripartite model of depression and anxiety. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Implicit and explicit self-esteem discrepancies in paranoia and depression.

The main purpose of the present study was to examine implicit and explicit self-esteem (SE) in patients with persecutory delusions. In samples of paranoid patients, depressed patients, and healthy controls, implicit SE was assessed using the experimental go/no-go association task, whereas explicit SE was measured using 2 self-reporting questionnaires: the self-worth subscale of the World Assumption Scale (Janoff-Bulman, 1989) and the self-acceptance subscale of the Scales of Psychological Well-Being (Ryff & Keyes, 1995). Our analysis revealed that depressed patients showed lower explicit SE than did paranoid and healthy control participants. However, participants with persecutory delusions had significantly lower implicit SE scores than did healthy controls. We interpret the discrepancies observed between overt and covert measures in the paranoid group as psychological defense mechanisms. The present study stresses the clinical and theoretical importance of the use of implicit measures in psychopathology. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Cognitive factors in source monitoring and auditory hallucinations

BACKGROUND: In order to elucidate further the cognitive processes underlying auditory hallucinations, an experiment investigating delayed and immediate source monitoring for positive, negative and neutral verbal material was conducted with schizophrenic patients. METHODS: Patients experiencing auditory hallucinations, patients not experiencing auditory hallucinations and normal subjects participated in a word association task, rating their responses for how much a self-generated thought was their own, how controllable and involuntary it was and their confidence in these ratings. A delayed source monitoring test in which subjects had to recall the source (self or experimenter) of the words from the association task was also administered. RESULTS: Hallucinators showed a greater bias towards external attribution of their thoughts compared with both control groups for immediate attributions of source, but not for delayed attributions. Hallucinators showed a bias towards external attribution of emotional material for immediate source monitoring and all subjects showed a bias towards misattribution of positive material to an external source and negative material to an internal source for the delayed source monitoring task. CONCLUSIONS: These findings appear to be most consistent with theories proposing that hallucinations result from an external attributional bias for internal events. The implications of these results for research and practice are also discussed.     

Depression, self-focused attention, and expectancies for positive and negative future life events for self and others.

In two studies, we examined depressed and nondepressed persons' judgments of the probability of future positive and negative life events occurring to themselves and to others. Study 1 demonstrated that depressed subjects were generally less optimistic than their nondepressed counterparts: Although nondepressed subjects rated positive events as more likely to happen to themselves than negative events, depressed subjects did not. In addition, relative to nondepressed subjects, depressed subjects rated positive events as less likely to occur to themselves and more likely to occur to others and negative events as more likely to occur to both self and others. Study 2 investigated the role that differential levels of self-focused attention might play in mediating these differences. On the basis of prior findings that depressed persons generally engage in higher levels of self-focus than nondepressed persons do and the notion that self-focus activates one's self-schema, we hypothesized that inducing depressed subjects to focus externally would attenuate their pessimistic tendencies. Data from Study 2 supported the hypothesis that high levels of self-focus partially mediate depressive pessimism: Whereas self-focused depressed subjects were more pessimistic than nondepressed subjects, externally focused depressed subjects were not. The role of attentional focus in maintaining these and other depressive pessimistic tendencies was discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Changes in perceptual asymmetries with clinical improvement of depression and schizophrenia.

16 depressed patients, 16 schizophrenic patients, and 16 normal controls (20–50 yrs old) were given 2 dichotic listening tests and 2 cognitive tests at intervals ranging from patients' initial hospitalization to recovery. Repeated-measures ANOVA revealed that severely depressed Ss failed to obtain normal ear-superiority in either dichotic test; however, normal superiorities emerged with recovery from depression. Schizophrenic Ss initially failed to show normal right-ear superiority on a dichotic-words test but did obtain the expected left-ear advantage on a dichotic-chords test. Following treatment, schizophrenics shifted from a left-ear to a right-ear advantage in dichotic chords and also increased (although not significantly) their right-ear advantage in dichotic words. Both patient groups showed normal word-fluency but impaired spatial ability, which did not improve with recovery. Results suggest that both depression and schizophrenia are associated with a breakdown in the process of interhemispheric inhibition that mediates perceptual asymmetry. In depression, treatment returned Ss' normal patterns of asymmetry, whereas in schizophrenia, treatment created an abnormal pattern of asymmetry that may have reflected the allocation of both verbal and nonverbal material to the left hemisphere. (42 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Unconscious Cost of Good Fortune: Implicit and Explicit Self-Esteem, Positive Life Events, and Health.

J. D. Brown and K. L. McGill (1989) found that positive life events were associated with better health only for people high in self-esteem. Among people low in self-esteem, positive life events were associated with poorer health. The authors of this study replicated this finding in a self-report survey of 61 male and 110 female college students. In addition, they showed that implicit self-esteem moderated the relation between positive life events and self-reported health in the same fashion as explicit self-esteem did. Whereas people high in implicit self-esteem reported being healthier when they experienced more positive life events, people low in implicit self-esteem reported being healthier when they experienced fewer positive life events. Moreover, the effects of implicit self-esteem were statistically independent of the effects of explicit self-esteem. (PsycINFO Database Record (c) 2010 APA, all rights reserved)