Sensory Modulation in Children Exposed to Continuous Traumatic Stress

Living under threat: adolescents' continuous traumatic stress reactions in relation to violence exposure

Background: Adolescents exposed to violence are at a higher risk for mental health problems than their peers. Exposure to ongoing violence can potentially lead to Continuous Traumatic Stress (CTS). CTS reactions have never been studied in relation to violence exposure in adolescent samples.Objective: We aimed to validate the Lithuanian version of the Continuous Traumatic Stress Response (CTSR) scale in the adolescent sample, to explore the adolescents' CTS reactions using the person-oriented approach, and to study the relationship between different types of violence and CTS reactions.Method: In total, 321 adolescents (M(SD)age = 14.19 (1.26)) from Lithuania were included in the current study, of which 181 (56.4%) were female, 135 (42.1%) were male, and 54.5% (n = 175) were continuously exposed to violence over their lifetime. Confirmatory factor analysis (CFA) with measurement invariance across genders and age groups was used to test the structural validity of the CTSR scale. A latent class-analysis approach was used to explore the patterns of CTS reactions.Results: The results showed good structural, convergent, and differential validity of the CTSR scale. Exhaustion/Detachment, Rage/Betrayal, and Fear/Helplessness were more profound in continuous violence exposure versus non-exposure groups, with even higher CTS reactions when recently exposed to violence. Three groups of adolescents with low, moderate, and high CTS reactions were distinguished with the suggested cut-off sum score of CTSR ≥18 for severe CTS reactions. The intensity of exposure to neglect, psychological abuse, physical abuse, and sexual abuse positively predicted Continuous traumatic stress (CTS) response group membership.Conclusions: These results stress the need for psychological support when exposed to continuous interpersonal violence in adolescence.

Sensory Responsiveness, Sexual Mindful Awareness, and Sexual Satisfaction Among Survivors of Childhood Sexual Abuse: A Cross-Sectional Mediation Analysis

Previous studies have demonstrated that a history of childhood sexual abuse (CSA) is associated with reduced sexual satisfaction among adult survivors. Recent studies have suggested that survivors of traumatic experiences may display sensory modulation dysfunction, manifested as either over- or under-responsiveness to sensory stimuli. In this study we examined a moderated mediation model according to which: a) the effect of history of CSA on adult sexual satisfaction would be mediated by both high and low sensory responsiveness, and b) these mediation effects would be moderated by sexual mindful awareness. Five-hundred-and-eighty adults completed questionnaires assessing history of CSA, sensory responsiveness, sexual mindful awareness, and sexual satisfaction. As hypothesized, high sensory responsiveness mediated the association between history of CSA and reduced sexual satisfaction. However, sexual mindful awareness moderated this mediation effect, and the indirect effect between history of CSA and sexual satisfaction through the mediation of high sensory responsiveness was significant among individuals with mean and high levels of sexual mindful awareness, but not among those with low levels of sexual mindful awareness. Given the cross-sectional study design, these effects warrant further longitudinal examination. Nevertheless, the findings suggest the need to address sensory modulation dysfunction to promote sexual satisfaction among survivors of CSA.

Repeated exposure to multiple concurrent stressors alters visual processing in the adult posterior parietal cortex

Chronic stress is well known to erode cognitive functions. Yet, our understanding of how repeated stress exposure impacts one of the fundamental bases of cognition: sensory processing, remains limited. The posterior parietal cortex (PPC) is a high order visual region, known for its role in visually guided decision making, multimodal integration, attention, and working memory. Here, we used functional measures to determine how repeated exposure to multiple concurrent stressors (RMS) affects sensory processing in the PPC in adult male mice. A longitudinal experimental design, repeatedly surveying the same population of neurons using in vivo two-photon imaging, revealed that RMS disrupts the balanced turnover of visually responsive cells in layer 2/3 of the PPC. Across the population, RMS-induced changes in visual responsiveness followed a bimodal distribution suggesting idiosyncratic stress effects. In cells that maintained their responsiveness across recording sessions, we found that stress reduced visual response magnitudes and feature selectivity. While we did not observe stress-induced elimination of excitatory synapses, noise correlation statistics indicated that RMS altered visual input to the neuronal population. The impact of RMS was restricted to visually evoked responses and was not evident in neuronal activity associated with locomotion onset. Together, our results indicate that despite no apparent synaptic reorganization, stress exposure in adulthood can disrupt sensory processing in the PPC, with the effects showing remarkable individual variation.

Sensory Processing Assessment and Feedback in the Treatment of Complex Developmental Trauma

This study explored the impact of a sensory processing assessment, recommendations and feedback process on the functioning at school and after-hours environments of children who had been traumatised by abuse. A mixed methods design (Schoonenboom & Johnson, 2017) was utilized incorporating pre (12 months prior) and post (four to eight months after the report) repeated child focused measure, alongside thematic analysis of participants qualitative survey feedback. The methodology included two stages: firstly, an occupational therapy assessment of young people referred by Own Organisation clinicians for a sensory processing assessment and secondly, an evaluation was conducted of the impact of occupational therapy on the young person's behaviour and their carers. The study found significant improvement in family life and relationships as well as a reduction in impairment as evidenced by decreases in HoNOSCA scores across problems with family life and relationships, non-accidental self-injury, problems with emotional and related symptoms, poor school attendance and on the social subscale. These findings were supported by clinician participant reports. A sensory processing assessment provided young people, their carers and teachers with information which contributed to environmental adaptations. These environmental adaptations were associated with improved functioning and behaviour of young people impacted by child abuse. It is recommended future research attempt to replicate and extend our understanding of how sensory processing assessments and interventions can increase children's wellbeing.

Supplementary Information

The online version contains supplementary material available at 10.1007/s40653-023-00607-0.

Sensory alterations in post-traumatic stress disorder

PTSD is characterized by difficulties in accurately evaluating the threat value of sensory stimuli. While the role of canonical fear and threat neural circuitry in this ability has been well studied, recent lines of evidence suggest a need to include more emphasis on sensory processing in the conceptualization of PTSD symptomology. Specifically, studies have demonstrated a strong association between variability in sensory processing regions and the severity of PTSD symptoms. In this review, we summarize recent findings that underscore the importance of sensory processing in PTSD, in addition to the structural and functional characteristics of associated sensory brain regions. First, we discuss the link between PTSD and various behavioral aspects of sensory processing. This is followed by a discussion of recent findings that link PTSD to variability in the structure of both gray and white matter in sensory brain regions. We then delve into how brain activity (measured with task-based and resting-state functional imaging) in sensory regions informs our understanding of PTSD symptomology.

The Long-Term Effects of Living in a Shared and Continuous Traumatic Reality: The Case of Israeli Families on the Border With Gaza

This article presents a literature review of the concept of intergenerational transmission of traumatic stress among a specific population of Israeli parents and children living near the Israeli/Gaza border, an area that can essentially be viewed as a laboratory of shared, continuous, and stressful reality resulting from ongoing political violence. The Google Scholar database was used to search only for peer-reviewed articles written in English and published between 2002 and 2020, and the particular focus of the study was Israeli families living in the "Gaza envelope": communities that have been on the receiving end of rockets and mortars from Gaza for the past 20 years. The review was based on 35 articles and sheds light on the existence of studies using a variety of perspectives (e.g., psychological, biopsychosocial, and behavioral). Findings demonstrate the effects of continuous stress situations on the family dynamic, even before birth, among this small population. In addition, they show that to understand the unique process of intergenerational trauma transmission in a shared continuous traumatic reality, it is important to adopt a comprehensive perspective so as to understand the reciprocal, long-lasting, and transgenerational effects of being exposed to traumatic stress. This perspective can be used as a basis for developing family intervention strategies that are appropriate for preventing stress outcomes that derive from living in the context of persistent violence.

The brain-body disconnect: A somatic sensory basis for trauma-related disorders

Although the manifestation of trauma in the body is a phenomenon well-endorsed by clinicians and traumatized individuals, the neurobiological underpinnings of this manifestation remain unclear. The notion of somatic sensory processing, which encompasses vestibular and somatosensory processing and relates to the sensory systems concerned with how the physical body exists in and relates to physical space, is introduced as a major contributor to overall regulatory, social-emotional, and self-referential functioning. From a phylogenetically and ontogenetically informed perspective, trauma-related symptomology is conceptualized to be grounded in brainstem-level somatic sensory processing dysfunction and its cascading influences on physiological arousal modulation, affect regulation, and higher-order capacities. Lastly, we introduce a novel hierarchical model bridging somatic sensory processes with limbic and neocortical mechanisms regulating an individual's emotional experience and sense of a relational, agentive self. This model provides a working framework for the neurobiologically informed assessment and treatment of trauma-related conditions from a somatic sensory processing perspective.

Sensory Processing, Perceived Stress and Burnout Symptoms in a Working Population during the COVID-19 Crisis

Although previous research suggests an association between sensory processing and perceived stress in a broad spectrum of mental health conditions, it remains unclear whether this phenomenon occurs independently from psychopathology. The present study investigated the association between sensory processing patterns, perceived stress and occupational burnout as a stress-related condition in a working population. We focused on different aspects of sensory processing and used the momentum of a particularly stressful period: during the first months of the global COVID-19 crisis. A total of 116 workers at a mental healthcare institution in The Netherlands completed the Adolescent/Adult Sensory Profile (AASP), the Perceived Stress Scale (PSS-10) and the Burnout Assessment Tool (BAT). Our results demonstrated that higher scores on sensory sensitivity and low registration were associated with higher scores on perceived stress and core burnout symptoms. Sensory hypersensitivity was also associated with more secondary burnout symptoms. Associations were not driven by underlying sensory-related disorders (e.g., ASD or ADHD). In conclusion, sensory processing difficulties are relevant predictors of stress and occupational burnout, also in healthy employees. This phenomenon warrants further attention, as relatively simple adjustments in working environment may possess important preventive effects.

Structural brain features signaling trauma, PTSD, or resilience? A systematic exploration

BACKGROUND

Studies have searched for neurobiological markers of trauma exposure, posttraumatic stress disorder (PTSD) diagnosis, and resilience to trauma to identify therapeutic targets for PTSD. Despite some promising results, findings are inconsistent.

AIMS

The present study adopted a data-driven approach to systematically explore whether structural brain markers of trauma, PTSD, or resilience emerge when all are explored.

MATERIALS & METHODS

Differences between clusters in the proportion of PTSD, healthy controls (HC), and trauma-exposed healthy controls (TEHC) served to indicate the presence of PTSD, trauma, and resilience markers, respectively. A total of 129 individuals, including 46 with PTSD, 49 TEHCs, and 34 HCs not exposed to trauma were scanned. Volumes, cortical thickness, and surface areas of interest were obtained from T1 structural MRI and used to identify data-driven clusters.

RESULTS

Two clusters were identified, differing in the proportion of TEHCs but not of PTSDs or HCs. The cluster with the higher proportion of TEHCs, referred to as the resilience cluster, was characterized by higher volume in brain regions implicated in trauma exposure, especially the thalamus and rostral middle frontal gyrus. Cross-validation established the robustness and consistency of the identified clusters.

DISCUSSION & CONCLUSION

Findings support the existence of structural brain markers of resilience.

Continuous Traumatic Stress and the Life Cycle: Exposure to Repeated Political Violence in Israel

PURPOSE OF REVIEW

Millions of individuals and families live under continual exposure to threat such as protracted socio-political conflict or community violence facing current and future danger. The construct of continuous traumatic stress (CTS) was suggested as a supplement perspective for the understanding of the specific impact of living under both current and realistic future threat. Yet, the unique parameters, utility, and validity of the construct CTS are underexplored.

RECENT FINDINGS

Currently, CTS describes both the exposure and the unique clinical conglomerate of distress. In this paper, we first elaborate on the rationale for the construct of CTS. Then, we present evidence on the consequences of exposure to CTS in the Israeli context of continual ongoing and prolonged political violence. Research on CTS is presented across the life cycle with an emphasis on risk and protective factors from a developmental perspective. We conclude with implications for research, assessment, and interventions.