Similarity effects in visual working memory

Perceptual similarity is an important property of multiple stimuli. Its computation supports a wide range of cognitive functions, including reasoning, categorization, and memory recognition. It is important, therefore, to determine why previous research has found conflicting effects of inter-item similarity on visual working memory. Studies reporting a similarity advantage have used simple stimuli whose similarity varied along a featural continuum. Studies reporting a similarity disadvantage have used complex stimuli from either a single or multiple categories. To elucidate stimulus conditions for similarity effects in visual working memory, we tested memory for complex stimuli (faces) whose similarity varied along a morph continuum. Participants encoded 3 morphs generated from a single face identity in the similar condition, or 3 morphs generated from different face identities in the dissimilar condition. After a brief delay, a test face appeared at one of the encoding locations for participants to make a same/different judgment. Two experiments showed that similarity enhanced memory accuracy without changing the response criterion. These findings support previous computational models that incorporate featural variance as a component of working memory load. They delineate limitations of models that emphasize cortical resources or response decisions.     

Perceptual expertise improves category detection in natural scenes

There is much debate about how detection, categorization, and within-category identification relate to one another during object recognition. Whether these tasks rely on partially shared perceptual mechanisms may be determined by testing whether training on one of these tasks facilitates performance on another. In the present study we asked whether expertise in discriminating objects improves the detection of these objects in naturalistic scenes. Self-proclaimed car experts (N = 34) performed a car discrimination task to establish their level of expertise, followed by a visual search task where they were asked to detect cars and people in hundreds of photographs of natural scenes. Results revealed that expertise in discriminating cars was strongly correlated with car detection accuracy. This effect was specific to objects of expertise, as there was no influence of car expertise on person detection. These results indicate a close link between object discrimination and object detection performance, which we interpret as reflecting partially shared perceptual mechanisms and neural representations underlying these tasks: the increased sensitivity of the visual system for objects of expertise – as a result of extensive discrimination training – may benefit both the discrimination and the detection of these objects. Alternative interpretations are also discussed.     

Investigating the Perceptions of Intellectual Diversity Among Socially Conservative Christian Seniors at Elite U.S. Colleges

This study investigated the perceptions of intellectual diversity at elite U.S. universities through the lens of the socially conservative Christian senior. Closely aligned with the principle of academic freedom, intellectual diversity is a foundational value putatively espoused by most if not all colleges and universities in the US. Although studies have consistently shown a professorate that is overwhelmingly Democratic and ideologically left-of-center, many scholars deny that any systematic bias exists. Research has shown a correlation between commitment to Christian/conservative values and perception of professor bias. Using hierarchical generalized linear modeling (HGLM) on a subset of the nationally representative sample (N = 2,789) of “very high” institutions, this current study found corroborative evidence that socially conservative Christian students were disproportionately “dissatisfied” or “very dissatisfied” with their institutions’ respect for the expression of diverse beliefs. Generalized findings suggest that systematic bias vis-à-vis the expression of diverse beliefs exists at elite U.S. colleges. The discussion begins by situating intellectual diversity within its historical and contemporary contexts.     

Longitudinal evidence linking processing speed to the development of reasoning

Age‐related change in processing speed has been linked directly to increases in reasoning as well as indirectly via increases in the capacity of working memory (WM). Most of the evidence linking change in speed to reasoning has come from cross‐sectional research; in this article we present the findings from a 2½‐year longitudinal study of 277 6‐ to‐13‐year‐olds. On three occasions, speed of information processing was assessed with Visual Matching and Cross Out; WM was assessed with reading, listening, backward digit, alphabet, and operation span tasks; and nonverbal reasoning was assessed with Raven's progressive matrices. The results provided consistent evidence of direct links from processing speed to reasoning but inconsistent evidence for indirect links from speed to WM to reasoning. These findings suggest that variations in processing speed may constrain the development of reasoning, directly and perhaps indirectly. A video abstract of this article can be viewed at: https://youtu.be/nc0VlFdi468     

Keeping Up with the Joneses: Neighbourhood Wealth and Hypertension

Although individuals are known to be affected by concerns about relative position, little research investigates how neighbors’ wealth affects one’s hypertension risks. This paper investigates the relationship between neighborhood wealth and hypertension using both self-reported hypertension and objective hypertension. I find that self-reported hypertension rate substantially underestimates objectively measured hypertension rate. Consequently, while there is a positive, statistically significant relationship between neighborhood wealth and hypertension when using self-reported hypertension, the results based on measured hypertension data differ substantially, with the relationship only observed for people aged 55–65 but not for younger or older age groups. There is also evidence of a positive relationship between continuous blood pressure and neighborhood wealth for adult people (aged 30 or older).     

A Correlational Study of Creativity,Happiness, Motivation,and Stress from Creative Pursuits

This study examined the relationship of creative capacity with happiness, affect, motivation, and stress from creative pursuits using a sample of 420 students. In addition, it tested whether a relationship existed between overall creative capacity and specific styles or approaches to creative expression. A composite creative capacity score was derived from four creative capacity measures. Creative capacity was not significantly correlated with happiness, but it correlated significantly with positive and negative affect scales and with their absolute sum. Creative capacity correlated highest with intrinsic motivation (IM) among all variables. Creative capacity and IM correlated similarly in direction and magnitude with creativity styles subscales of Belief in Unconscious Processes, Use of Techniques, and Use of Senses, and negative correlations with the Use of People and Final Product Orientation Subscales.     

Salvaging the Biological Design Argument in Light of Darwinism?

It is a common assumption that biological organisms appear as though they were designed. Prior to the Darwinian revolution, the order of biological organisms was often taken as a sign of their divine Creator. It is also commonly argued that Darwinian evolutionary theory as a good explanation for the adaptive complexity of biology reveals this appearance to be merely an illusion. However, in recent philosophical discussion several defenses of the compatibility of divine design and Darwinian evolution have emerged. These defenses insist not only that divine design and evolution are compatible, but even that biological organisms can continue to function as pointers to the Creator, even in a Darwinian cosmos. This article explores and extends these recent arguments. I analyze four different strategies for arguing that the wisdom of the Creator is apparent in biological organisms. The basic underlying assumption is that the products of some larger whole can reflect the rationality and designedness of that whole.     

Young Children Choose to Inform Previously Knowledgeable Others

Children recognize that people who know more are better informants than those who know less. How does an individual’s prior knowledge affect children’s decisions about whom to inform? In 3 experiments, 3- to 6-year-old children were invited to share a novel piece of information with 1 of 2 potential recipients who differed in their recent history of knowledge. Children tended to inform the previously knowledgeable person rather than the previously ignorant person. This same effect was observed in a 4th experiment when the knowledgeable person stated that she already knew the information the participant had to share. In no case was the opposite pattern observed: Children never chose to inform the person who had known less. These results seem to conflict with equity considerations and may reflect a preference to affiliate with competent social partners.     

Masculine Ideology,Sexual Communication,and Sexual Self‐Efficacy Among Parenting Adolescent Couples

This study examined the relationship between traditional masculine role norms (status, toughness, anti‐femininity) and psychosocial mechanisms of sexual risk (sexual communication, sexual self‐efficacy) among young, low‐income, and minority parenting couples. Between 2007 and 2011, 296 pregnant adolescent females and their male partners were recruited from urban obstetrics clinics in Connecticut. Data regarding participants' beliefs in masculine role norms, frequency of general sex communication and sexual risk communication, and sexual self‐efficacy were collected via computer‐assisted self‐interviews. Generalized estimating equation (GEE) models were used to test for actor effects (whether a person's masculine role norms at baseline influence the person's own psychosocial variables at 6‐month follow‐up) and partner effects (whether a partner's masculine role norms at baseline influence an actor's psychosocial variables at 6‐month follow‐up). Results revealed that higher actor status norms were significantly associated with more sexual self‐efficacy, higher actor toughness norms were associated with less sexual self‐efficacy, and higher actor anti‐femininity norms were significantly associated with less general sex communication, sexual risk communication, and sexual self‐efficacy. No partner effects were found. These results indicate a need for redefining masculine role norms through family centered approaches in pregnant or parenting adolescent couples to increase sexual communication and sexual self‐efficacy. Further research is needed to understand partner effects in the context of a relationship and on subsequent sexual risk behavior.