Marital conventionalization as a measure of marital satisfaction: A confirmatory factor analysis.

It has been suggested that self-report measures of marital satisfaction are contaminated by a social desirability bias, which V. H. Edmonds (1967) termed marital conventionalization. Subsequent research showed that marital satisfaction measures were strongly correlated with marital conventionalization but not with social desirability scales. Because these measures tend to be so strongly correlated, this study examined whether marital satisfaction and conventionalization are best seen as 2 separate constructs or as a single construct. These measures were found to have 1 underlying factor based on confirmatory factor analyses with a sample of 2,109 individuals. Further analysis suggested that the relationship between marital satisfaction and conventionalization scales differs depending on the level of marital satisfaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Age-related increase in an advanced glycation end product in penile tissue

Nonenzymatic glycosylation (glycation) of proteins, often referred to as the Maillard reaction, has been proposed to play a role in age and diabetes-related processes by forming protein and DNA adducts and cross-links. These cross-links may contribute to erectile dysfunction by scavenging nitric oxide, which is needed for erection. As the basis for a possible role of the advanced Maillard reaction in age-related erectile dysfunction, we investigated the presence of the specific advanced glycation endproduct (AGE) pentosidine in penile corpus cavernosum tissue and penile tunica albuginea tissue as a function of age. A total of 23 penile tissue specimens were obtained at autopsy, from which 19 samples of tunica albuginea and 21 samples of corpus cavernosum were derived. In addition, 13 penile corporal and tunical specimens were procured at the time of insertion of a penile prosthesis, from which 12 tunica albugineal specimens and 10 samples of corpus cavernosum were derived. Collagen was extracted with acetic acid and pepsin digestion, and the final insoluble collagen product was acid-hydrolyzed with 6 N HCL for 24 h at 110 degrees C. Pentosidine was quantified by high-performance liquid chromatography using a reverse-phase column. The level of pentosidine (expressed in picomoles per milligram of insoluble collagen) was found to increase with age in cadaver as well as living penile corporal and tunical albugineal tissues. Best-fit analysis revealed an exponential increase in both types of cadaver penile tissue, with regression equations of y = 15.29 x 10(9.9e-3x), R2 = 0.79, being obtained in the tunica and y = 13.2 x 10(7.63e-3x), R2 = 0.56, in the corpora. These correspond to 6- and 4-fold increases in pentosidine levels from puberty to the age of 100 years (P < 0.05), respectively. Mean pentosidine levels were higher in the tunica than in the corpora. Comparison of pentosidine levels in the tunica versus the corpora revealed a weakly linear correlation (y = 24.88 + 1.08x, R2 = 0.32). Levels in the tunical and corporal specimens from the living human specimens fell with the predicted confidence intervals of the cadaveric tissue. Tunical specimens from patients who underwent repair or revision of a previously inserted penile prosthesis had very low levels of pentosidine. The exponential age-related increase in pentosidine observed in both types of penile tissue suggests an impairment of collagen turnover, which could be related to the advanced glycation reaction in aging. It is not known whether pentosidine itself is directly associated with erectile dysfunction, but its formation is usually accompanied by extensive tissue modification. Formation of advanced Maillard reaction products, which is greatly accelerated in aging, diabetes, and uremia, could contribute to erectile dysfunction in these syndromes.     

General Perfectly Periodic Scheduling

In a perfectly periodic schedule, each job must be scheduled precisely every some fixed number of time units after its previous occurrence. Traditionally, motivated by centralized systems, the perfect periodicity requirement is relaxed, the main goal being to attain the requested average rate. Recently, motivated by mobile clients with limited power supply, perfect periodicity seems to be an attractive alternative that allows clients to save energy by reducing their "busy waiting" time. In this case, clients may be willing to compromise their requested service rate in order to get perfect periodicity. In this paper we study a general model of perfectly periodic schedules, where each job has a requested period and a length; we assume that m jobs can be served in parallel for some given m. Job lengths may not be truncated, but granted periods may be different than the requested periods. We present an algorithm which computes schedules such that the worst-case proportion between the requested period and the granted period is guaranteed to be close to the lower bound. This algorithm improves on previous algorithms for perfect schedules in providing a worst-case guarantee rather than an average-case guarantee, in generalizing unit length jobs to arbitrary length jobs, and in generalizing the single-server model to multiple servers.     

The role of mothers' control in children's mastery orientation: A time frame analysis.

Important to understanding the process by which parents' control shapes children's motivation is identifying the time frame in which it does so. To this end, mothers and their 4-year-old children were observed interacting for 15 min while working on a challenging task twice over 6 months. Mothers' control and children's mastery orientation were coded in 1-min intervals at both times. Analyses over the 6 months indicated that mothers' heightened control foreshadowed children's dampened mastery because mothers' control was stable over time. Analyses over the 15-min interactions revealed that the more controlling mothers were one minute, the less mastery oriented children were the next minute, adjusting for their earlier mastery. Moreover, when mothers began these interactions highly controlling, children's mastery was particularly likely to decrease over the 15 min. Taken together, the results suggest the effect of mothers' control on children's mastery is immediate and maintained through mothers' continued controlling practices. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ability mindsets influence the quality of mothers' involvement in children's learning: An experimental investigation.

This research examined the role of mothers' mindsets about the malleability of children's ability in the quality of their involvement in children's learning. Mothers (N = 79) of early elementary school children (mean age = 7.65 years) were induced to hold either an entity mindset, in which children's ability is seen as unchangeable, or an incremental mindset, in which children's ability is seen as changeable. Mothers and children were then observed as they worked on a set of challenging problems for 15 min. Unconstructive involvement (i.e., performance-oriented teaching, control, and negative affect) was more frequent among mothers induced to hold an entity mindset than those induced to hold an incremental mindset. Mothers with an entity (vs. incremental) mindset also responded to children's helplessness more unconstructively. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Grouping and emergent features in vision: Toward a theory of basic Gestalts.

Gestalt phenomena are often so powerful that mere demonstrations can confirm their existence, but Gestalts have proven hard to define and measure. Here we outline a theory of basic Gestalts (TBG) that defines Gestalts as emergent features (EFs). The logic relies on discovering wholes that are more discriminable than are the parts from which they are built. These wholes contain EFs that can act as basic features in human vision. As context is added to a visual stimulus, a hierarchy of EFs appears. Starting with a single dot and adding a second yields the first two potential EFs: the proximity (distance) and orientation (angle) between the two dots. A third dot introduces two more potential EFs: symmetry and linearity; a fourth dot produces surroundedness. This hierarchy may extend to collinearity, parallelism, closure, and more. We use the magnitude of Configural Superiority Effects to measure the salience of EFs on a common scale, potentially letting us compare the strengths of various grouping principles. TBG appears promising, with our initial experiments establishing and quantifying at least three basic EFs in human vision. (PsycINFO Database Record (c) 2011 APA, all rights reserved)