Living with the elderly is related to a better performance in the recognition of facial expressions of emotion among older individuals

Abstract Background: Cohabitation with the elderly may bring benefits to social relationships and exert an influence on the recognition of facial expressions of emotion. Objective: Compare emotion recognition skills between a cohabitation group (CHG) of older adults who live with a dependent elderly individual and a non-cohabitation group (NCHG) of older adults who do not live with an elderly individual. Methods: Interviews were conducted with 62 older adults in the CHG and 56 in the NCHG. The two groups were similar with regard to gender, age, schooling, degree of dependence, cognitive performance, and depressive symptoms. A dynamic task with six emotions (anger, disgust, happiness, surprise, sadness, and fear) and four levels of intensity was administered to evaluate the recognition of facial emotions. Results: The CHG performed better than the NCHG regarding the correct identification of emotions, specifically surprise (60%), disgust (60%, 80%, and 100%), fear (80%), and sadness (80% and 100%). Discussion: Cohabitation with an elderly individual seems to offer benefits to older adults in terms of recognizing facial expressions of emotion.</div

Distant horizontal gene transfer is rare for multiple families of prokaryotic insertion sequences

Horizontal gene transfer in prokaryotes is rampant on short and intermediate evolutionary time scales. It poses a fundamental problem to our ability to reconstruct the evolutionary tree of life. Is it also frequent over long evolutionary distances? To address this question, we analyzed the evolution of 2,091 insertion sequences from all 20 major families in 438 completely sequenced prokaryotic genomes. Specifically, we mapped insertion sequence occurrence on a 16S rDNA tree of the genomes we analyzed, and we also constructed phylogenetic trees of the insertion sequence transposase coding sequences. We found only 30 cases of likely horizontal transfer among distantly related prokaryotic clades. Most of these horizontal transfer events are ancient. Only seven events are recent. Almost all of these transfer events occur between pairs of human pathogens or commensals. If true also for other, non-mobile DNA, the rarity of distant horizontal transfer increases the odds of reliable phylogenetic inference from sequence data