Taijin-kyofusho – social anxiety disorder – fear of causing others discomfort

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Have you ever felt embarrassed for someone in your social group when they do something cringe-worthy?

Maybe it was a bad rendition of a hit song during Karaoke night or making a social faux par while at a big event.

Those feelings of embarrassment may be linked to social anxiety disorder.

You worry about how the behavior of others may affect other people’s opinions of you. This often leads to feeling distressed at the prospect of social events and gatherings.

Social anxiety disorder is a phenomenon that affects as many as one in ten Americans. Governed by feelings of extreme anxiety during social interactions and events, many with social anxiety disorder take pains to avoid gatherings.

Additionally, those who dread the prospect of others embarrassing themselves, and thus reflecting badly on the sufferer, can turn their perceived embarrassment and frustration on the perpetrator of the offense. This can ultimately lead to social isolation.

However, there is another form of social anxiety that often gets overlooked.

Dubbed taijin-kyofusho, people with this form of social anxiety fear making others uncomfortable with their own behavioral or physical responses to embarrassing situations.

Both social anxiety disorder (SAD) and taijin-kyofusho (TKS) have one thing in common.

Those who suffer from the conditions excessively focus on the perspectives and views of others.

Those with SAD obsess over a fear of being scrutinized and criticized by others, often influencing how they experience their own emotions.

By contrast, those with taijin-kyofusho fear causing others unnecessary discomfort as a result of their behavioral reactions, leading to them ruminating on the feelings of others over their own. Those with TKS generally have enhanced affective and reduced cognitive empathy.

Data suggests TKS is likely characterized by hypersensitivity to the feelings of others, and a less than accurate ability to recognize emotional context.

A recent neuroimaging study in PNAS revealed during cognitive empathy tests, those with TKS had increased activity within the posterior superior temporal sulcus/temporoparietal junction, and increased activity within the amygdala during tests for affective empathy.

The disruptions of functional brain connectivity, and the imbalance between both affective and cognitive empathy, could explain the deterioration of cognitive processes during embarrassing situations.

Ultimately, the findings suggest that not only do people with TKS feel the emotions of others more strongly, they often misinterpret the emotional context. This means those with TKS are inappropriately sensitive to the emotions of others, either perceived or otherwise.

The data suggests TKS is likely characterized by hypersensitivity to the feelings of others, and a less than accurate ability to recognize emotional context.


Social anxiety disorder (SAD), also called social phobia, is an anxiety disorder characterized by a marked fear or anxiety of social situations, including meeting people, talking in meetings or groups, starting conversations, eating while being observed, or being seen or speaking in public [1].

A person with SAD is afraid that he or she will make mistakes, look bad, or be embarrassed or humiliated in front of others. The onset of SAD occurs in childhood or adolescence by 11 years in about 50% and by 20 years in 80% of individuals [2].

SAD can negatively interfere with communication skills, general well-being, social life, and academic performance. Although several studies have shown that SAD is one of the most prevalent psychiatric disorders [3], SAD is considered a relatively new anxiety disorder according to classifications of the Diagnostic and Statistical Manual of Mental Disorders (DSM).

Although social phobia (phobies sociales), the name by which SAD was formerly referred, was first coined by Janet in his monograph published in the early 1900s [4], there was no corresponding concept of SAD in the US until Marks and Gelder divided phobic disorders into three types: agoraphobia, specific phobia, and social phobia [5]. For this reason, SAD was regarded as “a neglected anxiety disorder” [6].

Meanwhile, SAD in Japan has been described since the 1920s. Morita initially described the features of SAD as “Taijin-Kyofu-sho (TK)” literally meaning the disorder (sho) of fear (kyofu) of interpersonal relations (taijin) [78].

TK, a form of SAD, is regarded as a culture-bound anxiety disorder in Japan and other East Asian counties [9].

The fifth edition of the DSM (DSM-5) describes the characteristic features of TK as persistent and excessive fears of giving offense to others in social situations by their physical characteristics, such as blushing, gaze, or one’s body odor [10].

Several discussions have been published concerning the concept of TK. For example, some groups in East Asia classify TK into two subtypes [1112]; the tension or general type and the offensive type.

In the tension type, patients fear being looked down upon because of a physical manifestation of anxiety or embarrassment, such as blushing, in social situations.

They also feel shame for experiencing these anxieties and fears and therefore, avoid social situations where the anxiety might be provoked.

These features resemble SAD regarding “fear of being noticed” [11]. In contrast, the offensive type, which is regarded as the severe type of TK in Japan, is characterized by the fear of offending or disgusting others by eye contact or body odor.

Under the DSM diagnostic system, this type is classified as obsessive-compulsive disorder, body dysmorphic disorder, delusional disorder somatic type, or paranoid or schizotypal personality disorders, as observed in western countries [13]. Thus, although TK has been regarded as a type of SAD, it is still controversial whether these two disorders are identical because of several differences in their clinical features.

Although the concept of SAD is relatively new compared to TK, a growing body of research has revealed important findings on the etiology, diagnosis, cause, and treatment of this disorder. For example, several studies have reported the relationship between SAD and other psychiatric disorders, including mood disorder, obsessive compulsive disorder, panic disorder, autism, and attention deficit and hyperactivity disorder (ADHD) [21417].

From the viewpoint of developmental disorders, the assessment of SAD comorbidity is especially important in clinical practice, because the average age of SAD onset is during teenage life.

This suggests that developmental disorders may trigger or exacerbate SAD symptoms during early developmental stages. Indeed, several studies have indicated the high prevalence of SAD in children with ADHD [1819] and the high rate of ADHD history in adult patients with SAD [2022].

Despite the earlier discovery of TK in Japan, fewer studies have focused on TK than on SAD, and much fewer on its comorbidity with developmental disorders. To the best of our knowledge, there is no study on the relationship between TK and ADHD. Furthermore, there are limited studies regarding TK on university students [71023], although the typical age of TK onset is adolescence and early adulthood [4]. The aims of this study were to estimate the frequency of TK occurrence in Japanese university students and examine the association between TK and ADHD using self-reported screening tests.

Discussion

In the current study, we found that 17.4% and 10.3% of university students exceed the COV on the TK scale and the LSAS-J, respectively. Moreover, we discovered that female university students score higher on both the TK scale and LSAS-J than male students. Furthermore, we demonstrated that ASRS scores strongly correlate with TK scale rather than LSAS-J scores.

ADHD, characterized by chronic attention and impulse control deficits, was historically regarded as a disorder of childhood. However, prospective studies have shown that ADHD often persists into adulthood [3233], while a previous meta-analysis indicated that the prevalence of adult ADHD is 2.5-4.9% [3435].

Furthermore, comorbidity studies have demonstrated that 47% of adults with ADHD have anxiety disorders, including SAD (29%) [14].

Thus, there is an accumulation of research reporting the relationship between ADHD and SAD. However, to the best of our knowledge, this is the first report showing the correlation of ADHD and TK, which is a culture-bound form of SAD.

There are several studies on SAD using the LSAS-J for university students, and previous reports have shown that the total score on this scale ranges between 30 and 45 [103639]. In agreement, the median score on the LSAS-J in our study was 30.0.

Epidemiological studies have consistently shown a greater proportion of females meeting the criteria for SAD [4042]. Similarly, we also found that females scored significantly higher than males on this scale. Thus, our results on the LSAS-J are in line with previous reports.

Although there are several reports on the etiology of TK, very few have focused on young adults. Kleinknecht et al. developed the TK scale and compared the scores of U.S. and Japanese university students [7].

The authors found that Japanese students had higher scores than U.S. students (90.53 ± 29.04 vs 80.86 ± 26.88). Essau et al. investigated SAD and TK both in Japan and England, using the TK scale, and showed that the mean score on this scale was higher in Japanese students than in English students (93.45 ± 37.8 vs 72.51 ± 32.1) [43].

In our study, the median score (IQR) for both male and female students was 88.0 (61.0-113.0), similar to scores observed in previous studies. We also showed a statistically significant difference in TK-scale scores between male and female. In agreement, two studies by Essau et al. also showed that females scored significantly higher on the TK scale than males [4344].

ASRS is widely used as a diagnostic tool for the assessment of ADHD, and many studies have included young adults, as well as university students. For example, Takeda et al. examined the reliability and validity of the Japanese version of the ASRS for different subjects, including 894 university students, and showed that their mean score on this scale was 25.3 [45].

Yeh et al. reported a mean score of 24.8 for college students [46]. Consistently, we found a median score of 24.0 on the ASRS.

We observed a moderate correlation between the total ASRS and TK-scale scores and a weak correlation between the total ASRS and LSAS-J scores. The ASRS subscale IA showed moderate correlation with both TK subscales (o-TK and t-TK) but a weak correlation with LSAS-J subscales (fear and avoidance).

In addition, H/I weakly correlated with TK subscales and even more weakly with LSAS-J subscales. Koyuncu et al. reported a high frequency of childhood inattentive type ADHD in patients with SAD in Turkey [16] and that impulsiveness and SAD symptom severity are interrelated [20].

Thus, specific symptoms of ADHD show strong connection with SAD symptoms and severity; however, our results indicate that patients with ADHD in Japan tend to exhibit TK rather than SAD. We found that pure-TK subjects have higher scores on the ASRS (total, IA and H/I) than healthy controls, whereas there were no statistically significant differences between pure-SAD and healthy subjects.

These results indicate that students with clinical features of TK rather than SAD are more likely to present clinical features of ADHD. Subjects in the mixed group, with both SAD and TK features, showed higher ASRS scores than the other groups, suggesting two possible explanation:

(1) the features of TK and SAD may independently correlate with the clinical symptoms of ADHD and

(2) the mixed group may have included subjects whose severe psychopathology correlated with the symptoms of ADHD. Either way, future research should further characterize the relationship between subjects in the mixed group and ADHD symptoms.

Cultural undercurrents in Japan may contribute to the positive correlation between the scores on the ASRS and TK-scale. In Western countries, including the US, society is characterized by individualism; one receives praise for standing out from the crowd and being unique [747].

In contrast, East Asian societies, including Japan, are characterized by collectivism [48], where people need to sensitively perceive the feelings of others because “not bothering others” and “cooperativeness” are regarded as virtues; i.e., the fear of being disliked and even ostracized plays a prominent role in collectivistic societies like Japan [49].

Thus, the cultural background in East Asia, which easily promotes the development of personalities that are directed by others [50], may produce the feature of TK, i.e., “excessive fear of giving offense to others in social situations”.

Koyuncu et al. reported that higher rates of emotional traumatic experiences in patients with SAD and childhood ADHD than in those without ADHD [20]. This suggests that emotional trauma may constitute a link between ADHD and later development of SAD.

Indeed, a number of studies have found that children with ADHD are subject to peer rejection or peer victimization [5153] and are likely to experience great stress and trauma in interpersonal situations [5456]. In summary, children with features of ADHD in East Asia acquire the habit of reading too much into other people’s feelings, so as not to repeat the conflict with others, and this habit may transform into the features of TK.

Strength and Limitations of This Study

This is the first study to examine the association between TK and ADHD. However, the present study has some limitations. First, all participants were recruited from a single University. In Kyushu University, about 70% of the students are male, suggesting that our results cannot be generalized to all young adults in Japan.

Moreover, in order to show that our results are specific to East Asia, it is important to compare the impact of ADHD on TK between students in Western countries and students in East Asia. Second, we relied on self-reported assessment to diagnose SAD and TK.

In general, a clinical diagnosis is determined by a psychiatric interview, according to operational diagnostic criteria. Therefore, a clinical evaluation by structured interview would be required for the accurate diagnosis of TK and ADHD. Finally, we did not investigate the psychological background of each subject, such as self-construal, parental relation, and experience of traumatic events, which may be related to the pathogenesis of TK and ADHD. This information will deepen the understanding of the relationship between TK and ADHD.

Conclusions

The current study provided important information on the frequency of TK symptoms among young adults. Furthermore, we showed that females exhibit significantly higher scores than males on both the LSAS-J and TK-scale. In addition, we found that ASRS scores strongly correlate with TK-scale scores, suggesting a possible link between ADHD and later development of TK. Further studies are needed to elucidate the impact of ADHD on TK from the viewpoint of cross-cultural comparison, self-construal, and traumatic events during early developmental stages. In particular, as the two distinct features of TK (o-TK and t-TK) complicate the understanding of its psychopathology, the development of a screening method for o-TK and/or t-TK will help to determine the relevance of TK to other psychiatric disorders.


Original Research: Open access
“Brain and behavioral alterations in subjects with social anxiety dominated by empathic embarrassment”. Shisei Tei, Jukka-Pekka Kauppi, Kathryn F. Jankowski, Junya Fujino, Ricardo P. Monti, Jussi Tohka, Nobuhito Abe, Toshiya Murai, Hidehiko Takahashi, and Riitta Hari.
PNAS doi:10.1073/pnas.1918081117.

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