Maternal depression and children's adjustment problems : the role of mothers' affective reactivity

textMothers with depressive symptoms often express more negative emotions than other mothers, react more punitively, and express more frustration (e.g., Belsky, 1984). Paradoxically, mothers with depressive symptoms are also often found to be less, not more, reactive and to express flat rather than negative affect. These mothers are often described as emotionally "flat", unresponsive, and withdrawn (Kochanska, Kuczynski, Radke-Yarrow, & Welsh, 1987). Mothers' depressive symptoms are also associated with problematic parenting, interfering with children's social development (e.g., Goodman et al., 2011). This study investigated the possibility that mothers with depressive symptoms regulate their affect as a coping strategy to minimize distress when facing aversive child behaviors. Using observational and reported longitudinal data from 319 mother-child dyads, we examined how mothers' affective reactivity changes as a function of (a) changes in mothers' depressive symptoms, and (b) changes in children’s aversiveness during the course of the mother-child interaction. Depressive symptoms were associated with mothers' under-reactivity to low aversive child behaviors. Depressive symptoms also predicted rapid increases in mothers' negative reactivity as children's aversiveness increased, and negative over-reactivity to highly aversive child behaviors. Mothers' affective under-reactivity, over-reactivity, and depressive symptoms were all associated with children's adjustment problems over a two-year period. Results suggest that when aversive child behaviors are minimally disturbing, mothers with depressive symptoms minimize child rearing strain by not reacting; when aversive child behaviors are highly disturbing, they do so by resisting and controlling the child. Findings may enable us to understand adaptations that undermine parenting and place children at risk.Human Development and Family Science

Sharpness of Zapolsky inequality for quasi-states and Poisson brackets

Zapolsky inequality gives a lower bound for the L1 norm of the Poisson bracket of a pair of C1 functions on the two-dimensional sphere by means of quasi-states. Here we show that this lower bound is sharp

Shedding light on walking in the dark: the effects of reduced lighting on the gait of older adults with a higher-level gait disorder and controls

OBJECTIVE: To study the effects of reduced lighting on the gait of older adults with a high level gait disorder (HLGD) and to compare their response to that of healthy elderly controls. METHODS: 22 patients with a HLGD and 20 age-matched healthy controls were studied under usual lighting conditions (1000 lumens) and in near darkness (5 lumens). Gait speed and gait dynamics were measured under both conditions. Cognitive function, co-morbidities, depressive symptoms, and vision were also evaluated. RESULTS: Under usual lighting conditions, patients walked more slowly, with reduced swing times, and increased stride-to-stride variability, compared to controls. When walking under near darkness conditions, both groups slowed their gait. All other measures of gait were not affected by lighting in the controls. In contrast, patients further reduced their swing times and increased their stride-to-stride variability, both stride time variability and swing time variability. The unique response of the patients was not explained by vision, mental status, co-morbidities, or the values of walking under usual lighting conditions. CONCLUSION: Walking with reduced lighting does not affect the gait of healthy elderly subjects, except for a reduction in speed. On the other hand, the gait of older adults with a HLGD becomes more variable and unsteady when they walk in near darkness, despite adapting a slow and cautious gait. Further work is needed to identify the causes of the maladaptive response among patients with a HLGD and the potential connection between this behavior and the increased fall risk observed in these patients