Objective: Apathy, the reduction of motivation and goal-directed behaviour, is a ubiquitous behavioural syndrome in many neurological disorders. However, apathy measures are limited in non-English speaking countries. The present study aimed to develop a culturally appropriate version of the Vietnamese Frontal Systems Behavioural Scale-Apathy subscale (V-FrSBe-A) and Dimensional Apathy Scale (V-DAS), examine their internal reliability and construct validity (i.e., factor structure, convergent and divergent validity) in a Vietnamese healthy sample and establish preliminary normative cut-offs for clinical and research applications. Method: In total, 112 healthy subjects and 64 informants completed the self-report and informant report V-FrSBe-A and V-DAS, developed using a translation, back-translation and cultural adaptation procedure. McDonald’s omega was applied to examine internal reliability. The internal structure of the V-DAS was evaluated using exploratory structural equation model. For both apathy scales, convergent validity was determined by correlations between scales and between informant and self-report versions. Regarding divergent validity, participants completed the Vietnamese Depression Anxiety Stress Scale-21 and V-FrSBe-Disinhibition for depression and disinhibition assessment. Results: Both the V-FrSBe-A and V-DAS were reliable (ω t ≥ .74). Dimensional manifestations of apathy in executive, emotional and initiation domains were confirmed on the V-DAS. Both scales were also valid, convergent with each other and divergent from depression and disinhibition symptoms. Cut-off scores for both scales were higher than their English versions. Conclusion: The adapted V-FrSBe-A and V-DAS have good reliability and validity for the potential application in clinical groups to advance current knowledge about apathy transculturally and direct more effective clinical care for Vietnamese individuals with neurological disorders.

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Objective: The reduction of goal-directed behavior, termed apathy, is a pervasive and debilitating syndrome after traumatic brain injury (TBI). However, understanding of apathy as a multifaceted construct is limited, especially in Southeast Asian nations. This study aimed to investigate the severity, insight, and psychosocial influences of apathy in executive, emotional, and initiation dimensions in Vietnam-a country with high prevalence of TBI. Method: One hundred and eleven Vietnamese participants (61 individuals with moderate to severe TBI and 50 healthy controls) and their informants completed the self-rated and informant-rated Dimensional Apathy Scale (DAS) for the assessment of executive, emotional, and initiation apathy severity. Insight of apathy was calculated by subtracting DAS self-ratings from informant ratings. Additionally, carers completed measures assessing psychosocial factors of overall family health and overprotective behavior, while participants rated their own self-efficacy. Results: Our results showed greater informant-rated apathy for all three dimensions in individuals with TBI relative to controls. However, while people with TBI had greater selfrated initiation apathy, they regarded their executive apathy as lower and their emotional apathy as similar compared with controls. Reduced insight in patients was seen for executive and initiation apathy. Across participants, executive apathy was predicted by family functioning and overprotectiveness, emotional apathy was predicted by family functioning, and initiation apathy was predicted by self-efficacy. Conclusions: These findings support the multidimensional characterizations and socio-cultural considerations of apathy after TBI, which will potentially develop both individual-specific and symptom-specific approaches in clinical practice. Key PointsQuestion: What are the clinical profiles of apathy after TBI in Vietnam? Findings: While apathy manifests in executive, emotional, and initiation dimensions after TBI, patients have reduced insight into some of these symptoms. The severity of apathy is predicted by family functioning and carers' overprotectiveness and patients' self-efficacy in Vietnam. Importance: Apathy is a multifaceted construct after TBI. Evaluations and treatment of apathy in Vietnam should be based on carer reports, specific psychosocial influences, and cultural contexts. Next Steps: Future cross-cultural studies are needed to facilitate better comparisons of apathy presentation and enhance precision of clinical practice.

BackgroundDysarthria, aphasia and executive processes have been examined for their role in producing impaired communicative competence post traumatic brain injury (TBI). Less understood is the role of emotional dysregulation, that is, apathy and disinhibition, and social cognition, that is, reading and interpreting social cues.Methods & ProceduresIn this study, we examined 49 adults with moderate to severe TBI and 18 neurologically healthy adults. We hypothesised that apathy and disinhibition would predict communication outcomes as would social cognition. We also predicted that apathy and disinhibition would influence social cognition. Communication outcomes were measured by the La Trobe Communication Questionnaire (LCQ) and the Social Skills Questionnaire‐TBI (SSQ‐TBI). Apathy and disinhibition were measured by the Frontal Systems Behavior Scale (FrSBe). We measured four aspects of social cognition: emotion perception and theory of mind using The Awareness of Social Inference Test (TASIT) and the Complex Audio‐Visual Evaluation of Affect Test (CAVEAT), empathy using the Questionnaire of Cognitive and Affective Empathy (QCAE) and the Balanced Emotional Empathy Scale (BEES), and alexithymia using the Toronto Alexithymia Scale (TAS‐20) and the Bermond–Vorst Alexithymia Questionnaire.Outcomes & ResultsConsistent with predictions, the LCQ and SSQ‐TBI were associated with disinhibition and the LCQ was also associated with apathy. The LCQ was associated with the full range of social cognition constructs although the SSQ‐TBI was not. Finally, apathy and disinhibition predicted a number of social cognition measures.Conclusions and ImplicationsThese results are discussed in relation to understanding the nature of communication disorders following TBI and how they are measured, as well as the interrelation between emotion dysregulation and social cognition.What this study addsWhat is already known on this subjectThe role of emotional dysregulation and social cognition in producing impaired communicative competence post traumatic brain injury (TBI) is not well understood. Although most adults with severe TBI have minimal or possibly no language impairment, they often struggle with functional communication in everyday situations. Many have been reported to be overtalkative, insensitive, childish and self‐centred, displaying an inappropriate level of self‐disclosure and making tangential and irrelevant comments. Conversely, some speakers with TBI have been noted to have impoverished communication, producing little language either spontaneously or in response to the speaker’s questions and prompts.What this paper adds to existing knowledgeWe found that both apathy and disinhibition were strongly associated with the Latrobe Communication Questionnaire both empirically and conceptually, despite the LCQ being developed from a different, pragmatic orientation. Disinhibition was also associated with the Social Skills Questionnaire for TBI. We also found that poor social cognition scores predicted communication difficulties. Finally, we found that behavioural dysregulation itself, i.e., both apathy and disinhibition, predicted poor social cognition.What are the potential or actual clinical implications of this work?Our findings highlight the central role that apathy and disinhibition play in both communication and social cognition. These insights point to the importance of remediation to target behavioural and autonomic dysregulation as a means to improve everyday social function.

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