Object-in-place Memory Predicted by Anterolateral Entorhinal Cortex and Parahippocampal Cortex Volume in Older Adults.

The lateral portion of the entorhinal cortex is one of the first brain regions affected by tau pathology, an important biomarker for Alzheimer disease. Improving our understanding of this region's cognitive role may help identify better cognitive tests for early detection of Alzheimer disease. Based on its functional connections, we tested the idea that the human anterolateral entorhinal cortex (alERC) may play a role in integrating spatial information into object representations. We recently demonstrated that the volume of the alERC was related to processing the spatial relationships of the features within an object [Yeung, L. K., Olsen, R. K., Bild-Enkin, H. E. P., D'Angelo, M. C., Kacollja, A., McQuiggan, D. A., et al. Anterolateral entorhinal cortex volume predicted by altered intra-item configural processing. Journal of Neuroscience, 37, 5527-5538, 2017]. In this study, we investigated whether the human alERC might also play a role in processing the spatial relationships between an object and its environment using an eye-tracking task that assessed visual fixations to a critical object within a scene. Guided by rodent work, we measured both object-in-place memory, the association of an object with a given context [Wilson, D. I., Langston, R. F., Schlesiger, M. I., Wagner, M., Watanabe, S., & Ainge, J. A. Lateral entorhinal cortex is critical for novel object-context recognition. Hippocampus, 23, 352-366, 2013], and object-trace memory, the memory for the former location of objects [Tsao, A., Moser, M. B., & Moser, E. I. Traces of experience in the lateral entorhinal cortex. Current Biology, 23, 399-405, 2013]. In a group of older adults with varying stages of brain atrophy and cognitive decline, we found that the volume of the alERC and the volume of the parahippocampal cortex selectively predicted object-in-place memory, but not object-trace memory. These results provide support for the notion that the alERC may integrate spatial information into object representations.

Differentiating Childhood Traumas in Inflammatory Bowel Disease.

Background: Inflammatory bowel disease is characterized by chronic inflammation of the gastrointestinal tract. Research on inflammatory bowel disease has shown a connection to childhood traumatic events. However, few studies have focused on specific types of traumatic experiences and the impact of confiding in others on disease-related outcomes. This comparative, cross-sectional study expected that: (1) patients would report higher prevalence rates of childhood traumas than healthy controls; (2) healthy controls would report fewer and less severe traumatic experiences than patients and less confiding in others compared to patients; (3) childhood trauma severity would be indirectly related to depressive symptoms through resilience and confiding in others would moderate this relationship. Methods: Participants completed an online survey; an inflammatory bowel disease patient group (N = 195, Mage = 40.48, 76.4% female) was compared to a similarly recruited sample of healthy controls (N = 190, Mage = 31.16, 59.5% female). Results: Patients reported a higher prevalence of experiencing sexual traumas (P = .031), major upheavals (i.e., disruptions) (P = .048), and violence (P = .050) than controls. Patients had significantly higher total trauma severity odds ratios (OR 0.89, 95% CI[0.81,0.97]) and significantly lower total confiding in other odds ratios than controls (OR 1.09, 95% CI[1.02,1.16]). Childhood trauma severity was indirectly related to depressive symptoms through resilience, b = .05, SE = 0.09, 95% CI[0.01,0.09]; however, confiding did not moderate this relationship. Conclusions: Patients reported more sexual, disruptive, and violent traumas. Although confiding did not act as a moderator, trauma was related to depressive symptoms through resilience.

Childhood trauma, depression, resilience and suicide risk in individuals with inflammatory bowel disease.

Despite the prevalence of suicide risk in inflammatory bowel disease populations, research has yet to examine associations between childhood trauma, resilience, depression and suicide risk. In the present online study, 172 participants responded to measures of childhood trauma, resilience, depression and suicide risk. A moderated mediation revealed that resilience does not moderate the associations between childhood trauma, depressive symptoms and suicide risk. However, a serial mediation revealed that childhood trauma is associated with decreased resilience, which is related to higher depressive symptoms, and ultimately higher suicide risk, thus suggesting resilience and depression as significant intervention targets.

Modelling symptoms to suicide risk in individuals with inflammatory bowel disease.

Given that suicidal behaviour is a pressing concern in inflammatory bowel disease populations, this study sought to model the sequence of variables that lead to its development. Participants (n = 282) completed online self-report questionnaires regarding predictors of suicidal behaviour. A cross-sectional model of the progression from symptoms to suicide risk revealed that biomedical variables were significantly associated with psychosocial predictors of suicidal behaviour, which were significantly related to theory-driven predictors of suicidal behaviour, which were ultimately associated with suicide risk. Evidently, interventions need to target distal predictors of suicidal behaviour to mitigate harmful downstream effects.

Quality of life, depression, and psychosocial mechanisms of suicide risk in prostate cancer.

INTRODUCTION: Prostate cancer (PCa) is the most common non-cutaneous cancer in men and is usually identified at a stage at which prolonged survival is expected. Therefore, strategies to address survivorship and promote well-being are crucial. This study's aim was to better understand suicidal behavior in PCa patients by examining psychosocial mediators (i.e., depression, psychache, perceived burdensomeness [PB], thwarted belongingness [TB]) in the relationship between quality of life (PCa-QoL) and suicide risk. METHODS: Four hundred and six men with PCa (Median age 69.35 years, standard deviation 7.79) completed an online survey on various psychosocial variables associated with suicide risk. A combined serial/parallel mediation model tested whether depression, in serial with both psychache and PB/TB, mediated the relationship between PCa-QoL and suicide risk. RESULTS: Over 14% of participants' self-reports indicated clinically significant suicide risk. Poorer PCa-QoL was related to greater depression, which was related to both greater psychache and PB/TB, which was associated with greater suicide risk. The serial mediation effect of depression and psychache was significantly stronger than that of depression and PB/TB. PCa-QoL did not predict suicide risk through depression alone, showing that depressive symptoms affect suicide risk through psychache and PB/TB. CONCLUSIONS: Given the alarming estimate of individuals at risk for suicide in this study, clinicians should consider patients with poorer PCa-QoL and elevated depression for psychosocial referral or management. Psychache (i.e., psychological pain) and PB/TB (i.e., poor social fit) may be important targets for reducing suicide risk intervention beyond the impact of depression alone.