Study of Spirituality in Elderly With Subjective Memory Complaints

Spirituality and Religious Practices and Its Association with Geriatric Syndromes in Older Adults Attending to a Geriatric's Clinic in a University Hospital

Demographic aging has led to an increase in the prevalence of different diseases, including the so-called geriatric syndromes (GS), like depression, disability and frailty phenotype (FP). Spirituality and religious practices (RP) have been associated with positive health outcomes and could be a protective factor against the development of some GS. Study aims was to determine the frequency of spirituality and RP, and their associations between some GS in adults 60 years of age or older, who attended a geriatric clinic in a university hospital in Mexico. Cross-sectional study in adults aged ≥ 60 years, recruited in 2018, was performed. Participants underwent a comprehensive geriatric assessment, with which spirituality and religious practices model and the diagnosis of GS were obtained. Linear regression analyses were determined to establish the association between RP and GS. We included 128 subjects; mean age was 79 years (SD ± 8). Lowers scores for mass and communion assiduity were associated with worst disability and FP scores (b = - 0.35, P = 0.02; b = - 0.37, P = 0.03). The RP model explained 8% (R² = 0.083) of the total variance of the depressive symptoms score (P = 0.03). This study showed that the prevalence of RP is higher in Mexican older adults. The RP model can explain 8 and 9% of the variation in dependent variables (depressive symptoms and disability). These results suggest the importance of monitoring RP, as they seem to have a positive impact on health status of the elderly.

Functional and structural connectivity of the amygdala underpins locus of control in mild cognitive impairment

Locus of control (LOC) is an important personality trait. LOC over cognitive competency reflects an individual's perceived control of desired cognitive outcomes, which is critical for maintaining successful cognitive aging. It is important to understand the neural substrates of LOC over cognitive competency in older adults, especially for individuals at high risk of dementia. Here, we characterized a cohesive functional and structural connectivity profile underlying LOC among 55 older adults with amnestic mild cognitive impairment (aMCI), combining resting-state functional magnetic resonance imaging and diffusion tensor imaging. The results showed that both functional and structural connectivity between the medial prefrontal cortex and amygdala were significantly correlated with external LOC. The functional connectivity mediated the correlation between structural connectivity and external LOC. In addition, aging-associated neurodegeneration moderated the relationship between structural connectivity and external LOC, showing that the structural connectivity was positively correlated with external LOC in low, but not high neurodegeneration. Our results suggest a critical role of the functional amygdala-frontal network, which may serve as a bridge between its white matter tract and LOC over cognitive competency in groups at high risk for dementia.

Amygdala functional connectivity is associated with locus of control in the context of cognitive aging

Locus of control (LOC) measures the extent to which individuals perceive control over their lives. Those with a more "internal" LOC feel self-sufficient and able to determine important aspects of their own future, while those with a more "external" LOC feel that their lives are governed by events beyond their control. Reduced internal LOC and increased external LOC have been found in cognitive disorders, but the neural substrates of these control perceptions are yet unknown. In the present study, we explored the relationship between amygdala functional connectivity and LOC in 18 amnestic mild cognitive impairment (MCI) and age-, sex-, and education-matched, 22 cognitively healthy controls (HC). Participants completed cognitive challenge tasks (Stroop Word Color task and Dual 1-back) for 20min, and underwent resting-state functional magnetic resonance imaging immediately before and after the tasks. We found significantly lower internal LOC and higher external LOC in the MCI group than the HC group. Compared to HC, MCI group showed significantly stronger positive associations between internal LOC and baseline right amygdala connections (including right middle frontal gyrus and anterior cingulate cortex), and stronger negative associations between internal LOC and change of these right amygdala connections. Across all participants, external LOC explained the relationships between associations of another set of right amygdala connections (including middle cingulate cortex and right superior frontal gyrus), both at baseline and for change, and performance in the cognitive challenge tasks. Our findings indicate that the right amygdala networks might be critical in understanding the neural mechanisms underlying LOC's role in cognitive aging.