Construction of scales to measure thematic tendencies of paranoid ideation.

Tanno, Yoshihiko; Ishigaki, Takuma; Sugiura, Yoshinori

doi:10.4992/jjpsy.71.379

Cited by 7 publications

(13 citation statements)

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“…Instead, the significant negative correlation between scores on the positive delusional ideation scales and those on the negative delusional ideation scales indicated that the participants with positive delusional ideation are not likely to simultaneously experience negative delusional ideation, and vice versa. The previous study also found that people in manic states experience selfconceit, people with depression experience diminished self-esteem, and people with schizophrenia experience persecution (Tanno et al, 2000). When participants were not differentiated according to positive or negative delusional ideation, the results of the old-new recognition task did not show differences between those prone to positive vs. those prone to negative delusional ideation with regard to the adjectives used to describe personality traits.…”

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 88%

“…Based on this result, we rejected the possibility that we selected participants more likely to give higher scores to items reflecting high delusional ideation and lower scores to items reflecting low delusional ideation. We concluded that the DIC (Tanno et al, 2000) is useful for differentiating between positive and negative delusional ideation.…”

Section: Methodsmentioning

confidence: 84%

“…The PDI has been widely used to measure delusional ideation in a normal population. Tanno, Ishigaki, and Sugiura (2000) pointed out that the PDI measures primarily schizophrenic delusional ideation and therefore created the Delusional Ideation Checklist (DIC; Tanno et al, 2000), which measures a wide variety of delusional ideation within a normal healthy population. Eight scales were constructed from the results of factor analysis of the DIC: alienation, belittlement, persecution, other‐harming, guardedness, self‐conceit, specialness, and manipulativeness.…”

mentioning

confidence: 99%

“…These scales were also classified in terms of positive vs. negative emotion. Tanno et al (2000) asked university students to complete the DIC and reported that the number who had experienced positive and/or negative delusional ideation exceeded the expectations of psychiatrists. In this study, we differentiated between positive and negative delusional ideation using the DIC, and investigated the relationships between memory and scores on the positive and negative delusional ideation scales.…”

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confidence: 99%

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Effects of positive and negative delusional ideation on memory

Sugimori

Tanno

2009

Int J Psychol

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We investigated the relationship between levels of delusional ideation (whether positive or negative delusions) and the activation and distortion of memory by using pairs of positive and negative adjectives describing personality traits where those adjectives had similar meanings. We presented one of each pair of adjectives in the learning phase. Immediately after the learning phase in Experiment 1, we asked whether each adjective had been presented. Participants with high (positive or negative) delusional ideation were more likely to indicate that they had learned adjectives that they had not actually learned. This finding suggested that non-learned positive (or negative) adjectives that were associated with learned negative (or positive) adjectives were more likely to be activated in participants prone to positive (or negative) delusional ideation. However, in Experiment 2, two forced-choice tests were conducted immediately after the learning phase. In this context, participants, regardless of their proneness to delusional ideation, could almost always correctly distinguish what had and had not been presented, suggesting that the activation of learned items was still stronger than that for non-learned items in the immediate test. As time passed, the proportion of false alarms for positive or negative adjectives was higher in the two forced-choice tests among those with high proneness to (positive or negative) delusional ideation, suggesting that participants with delusional ideation were increasingly likely to depend on internal conditions for retrieval over time. Nous avons examiné la relation entre les niveaux d'idéation illusoire (qu'elle soit positive ou négative) et l'activation et la distorsion de la mémoire, en utilisant des paires d'adjectifs positifs et négatifs à significations similaires décrivant des traits de personnalité. Nous avons présenté un membre de chaque paire d'adjectifs lors d'une phase d'apprentissage. Dans une première expérience, immédiatement après la phase d'apprentissage, nous avons demandé si chaque adjectif avait été présenté. Les participants ayant un niveau d'idéation illusoire (positive ou négative) élevé étaient plus susceptibles d'indiquer qu'ils avaient appris les adjectifs qu'ils n'avaient pas appris. Ce résultat suggérait que les adjectifs positifs (ou négatifs) non appris qui étaient associés à des adjectifs négatifs (ou positifs) appris étaient plus susceptibles d'être activés chez les participants portés à l'idéation illusoire positive (ou négative). Dans une deuxième expérience, deux tests à choix forcés ont été menés immédiatement après la phase d'apprentissage. Dans ce contexte, les participants, indépendamment de leur tendance à l'idéation illusoire, pouvaient presque toujours distinguer correctement ce qui avait été présenté de ce qui n'avait pas été présenté, suggérant que l'activation des items appris était encore plus forte que celle des items non appris dans le test immédiat. Avec le temps, la proportion de fausses alarmes pour les adjectifs positifs ou négat...

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 84%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of positive and negative delusional ideation on memory

Sugimori

Tanno

2009

Int J Psychol

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Development of the Delusional Interpretation Scale and examination of related variables

Ito,

Matsumoto,

Hashimoto

et al. 2023

PCN Reports

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AimDelusions are a common symptom in schizophrenia. Some scales have been developed to measure delusional tendencies in healthy people, and nonpathological delusional thinking can occur even among these individuals. The existing scales measure the presence and frequency of delusional thoughts, distress levels, and confidence levels. However, these scales are limited because they do not consider the context of the delusions (i.e., where, with whom, and when). In this study, we developed a new scale that presents detailed scenes using illustrations and sentences and measures the tendency toward delusional interpretations.MethodsFactor analysis was conducted to confirm the factor structure of the new scale. To examine the validity of the scale, we analyzed the correlations between delusional tendencies and related variables and verified the consistency between the current scale and previously developed tools.ResultsFactor analysis confirmed that the new scale has a two‐factor structure, including “internal attribution and paranoid tendency” and “external attribution tendency.” The new scale was found to have acceptable reliability and validity. The internal attribution and paranoid tendency factor was negatively correlated with self‐esteem and decentering. Furthermore, the internal attribution and paranoid tendency factor showed a moderate positive correlation with depressive state and anxiety tendency and a very weak positive correlation with experiences of bullying or harassment.ConclusionThe correlations between the new scale and related variables confirmed the construct validity and replicated the results reported in previous studies. This new scale enables the measurement of delusional tendencies in healthy subjects based on the social context.

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