Everyday social support processes: Household members’ instrumental and emotional support of entrepreneurs

While it is well-established that entrepreneurs benefit from social support, little is known about how and when instrumental and emotional support from household members facilitate entrepreneurial action and persistence. Through a longitudinal, qualitative study, we develop a conceptual framework that shows how social support from the household becomes an integral part of the everyday activities of entrepreneurs. In contrast to the perception of social support as static, our findings illustrate it as a dynamic, ongoing process which is core to business start-up and growth over time. We also challenge the perspectives that households are simply repositories of resources and entrepreneurs passive recipients of support by demonstrating that social support is necessarily interactive, whereby entrepreneurs and households play a collaborative role in entrepreneurship. Finally, we join the debate concerning mechanisms of social support by suggesting that the main effect model and buffering hypothesis are not contradictory, but are instead interdependent.

The Moderation of Middle-Generation Support on the Relation of Stress and Depression in Coresident Grandparents

Consistent with Cohen & Wills’ Buffering Hypothesis, social support has been found to moderate the relation between stress and depressive symptoms but has yet to be examined among coresident grandparents (CGPs), a population at risk of increased stress and depression. The current study sought to extend the model to this highly prevalent, vulnerable population. Participants were 180 grandparents across the USA living with their grandchildren. Measures included depression, stress, and satisfaction with support provided by the middle generation (MG) parent of the grandchild. After controlling for age, gender, income, and household type (skipped or multi-gen), MG support moderated the relation between perceived stress and depressive symptoms, accounting for 49% of variance. For CGPs least satisfied with support provided by the MG, the more stress, the higher their depressive symptoms. These findings indicate that improving relationships with grandchildren’s parents is an important avenue for interventions focused on grandparent caregivers’ mental health.

Kinematic and dynamic aspects of chimpanzee knuckle walking - finger flexors likely do not buffer ground impact forces

Chimpanzees are knuckle-walkers, with forelimbs contacting the ground by the dorsum of the finger's middle phalanges. As these muscular apes are given to high velocity motions, the question arises how the ground reaction forces are buffered so that no damage ensues in the load bearing fingers. In literature, it was hypothesized that the finger flexors help buffer impacts because in knuckle stance the metacarpophalangeal joints (MCPJ) are strongly hyperextended, which would elongate the finger flexors. This stretching of the finger flexor muscle-tendon units would absorb impact energy. However, EMG studies did not report significant finger flexor activity in knuckle walking. While these data by themselves question the finger flexor impact buffering hypothesis, the present study aimed to critically investigate the hypothesis from a biomechanical point of view. Therefore, various aspects of knuckle walking were modeled and the finger flexor tendon displacements in the load bearing fingers were measured in a chimpanzee cadaver hand, of which also an MRI was taken in knuckle stance. The biomechanics do not support the finger flexor impact buffering hypothesis. In knuckle walking, the finger flexors are not elongated to lengths where passive strain forces would become important. Impact buffering by large flexion moments at the MCP joints from active finger flexors would result in impacts at the knuckles themselves, which is dysfunctional for various biomechanical reasons and does not occur in real knuckle walking. In conclusion, the current biomechanical analysis in accumulation of previous EMG findings suggests finger flexors play no role in impact buffering in knuckle walking.

Covariation of psychobiological stress regulation with valence and quantity of social interactions in everyday life: disentangling intra- and interindividual sources of variation

While the overall effects of social relationships on stress and health have extensively been described, it remains unclear how the experience of social interactions covaries with the activity of psychobiological stress in everyday life. We hypothesized that the valence as well as quantitative characteristics of social interactions in everyday life would attenuate psychobiological stress. Sixty healthy participants provided data for the analyses. Using an ecological momentary assessment design, participants received 6 prompts on their smartphone for 4 days. At each prompt, they reported on social interactions since the last prompt (any occurrence, frequency, duration, quality, and perceived social support), current subjective stress, and provided one saliva sample for the analyses of cortisol (sCort) and alpha-amylase (sAA). Experiencing any contact within days as well as higher daily levels of contact quality and perceived social support were associated with reduced levels of sCort. Furthermore, on a daily level, experiencing at least one contact in-between prompts more often as well as having more contacts on average attenuated the sAA output. Perceived social support and contact quality as well as higher daily contact durations were associated with lower subjective stress. For sCort, daily levels of stress moderated the effects of experiencing any contact within days while daily perceived social support moderated the effects of subjective stress. For sAA, experiencing at least one contact in-between prompts more often on a daily level moderated the effects of subjective stress. There were no between-person effects throughout all analyses. The results show ecologically valid evidence for direct attenuating effects of social interactions on psychobiological stress as well as for the stress-buffering hypothesis in everyday life. Increasing the quantity and improving the valence of social interactions on an intrapersonal level can possibly reduce psychobiological stress and prevent its consequences.

To buffer or to be labile? A framework to disentangle demographic patterns and evolutionary processes

Until recently, natural selection was assumed to reduce temporal fluctuation in vital rates due to its negative effects on population dynamics - the so-called Demographic Buffering Hypothesis (DBH). After several failures to support the DBH in the two decades since it was first posited, an alternative hypothesis was suggested; the Demographic Lability Hypothesis (DLH), where population vital rates should track rather than buffer the environmental conditions. Despite the huge contribution of both hypotheses to comprehend the demographic strategies to cope the environmental stochasticity, it remains unclear if they represent two competing patterns or the extreme ends of a continuum encompassing all demographic strategies. To solve this historical debate, we unify several methods with an integrative theoretical approach where: i) using the sum of stochastic elasticity with respect to mean and variance - a first-order derivative approach - we rank species on a Buffering-Lability (DB-DL) continuum and ii) using the second-order derivative, we examine how vital rates are shaped by natural selection. Our framework, applied to 40 populations of 34 mammals, successfully placed the species on the DB-DL continuum. We could also link the species' position on the DB-DL continuum to their generation time and time to recovery. Moreover, the second-order derivative unveiled that vital rates with lower temporal variation are not necessarily under a strong pressure of stabilizing selection, as predicted by DBH and DLH. Our framework provides an important step towards unifying the different perspectives of DBH and DLH with key evolutionary concepts.

Dyadic effects of attachment and relationship functioning

Some scholars have proposed that people in couples in which at least one person is secure are just as satisfied as people in which both members are secure (i.e., buffering hypothesis). The present investigation tested this hypothesis by examining how relationship satisfaction varies as a function of the attachment security of both dyad members. Secondary analyses were performed using data from two studies (Study 1: 172 couples; Study 2: 194 couples) in which heterosexual dating couples were asked to complete self-reports of their own attachment style and relationship satisfaction. To evaluate the buffering hypothesis, we fit a standard APIM using SEM and added an actor × partner interaction term to our model. Contrary to expectations, our results suggested that secure partners do not “buffer” insecurely attached individuals. Moreover, partner attachment did not explain satisfaction much above and beyond actor effects. This work addresses a gap in the literature with respect to the dynamic interplay of partner pairing, allowing scholars to better understand attachment processes in romantic relationships.