Grammatical class effects in relation to normal and aphasic sentence processing

Agrammatic, Broca's aphasic patients, Wernicke's aphasic patients, and neurologically intact control subjects were asked to detect target letters in prose passages and in a scrambled word passage. The targets were embedded, in some instances, in content words (open-class vocabulary items), and in other instances, in function words (closed-class vocabulary items). With respect to the prose passages, both the control subjects and Wernicke's aphasic patients were more apt to notice target letters when they appeared in the open-class items than when in closed-class items; by contrast, the agrammatic Broca's patients showed no vocabulary class detection difference. The Wernicke's patients were not entirely normal, however: Whereas the normal subjects showed a much smaller vocabulary class effect for letter detection in the scrambled condition, the Wernicke's maintained the pattern they had shown in the prose condition. These and other findings obtained on the letter cancellation task are discussed in relation to lexical access mechanisms geared to sentence parsing.     

Docosahexaenoic Acid and Visual Functioning in Preterm Infants: A Review

Preterm children are at risk for a number of visual impairments which can be important for a range of other more complex visuocognitive tasks reliant on visual information. Despite the relatively high incidence of visual impairments in this group there are no good predictors that would allow early identification of those at risk for adverse outcomes. Several lines of evidence suggest that docosahexaenoic acid (DHA) supplementation for preterm infants may improve outcomes in this area. For example, diets deficient in the long-chain polyunsaturated fatty acid DHA have been shown to reduce its concentration in the cerebral cortex and retina, which interferes with physiological processes important for cognition and visual functioning. Further, various studies with pregnant and lactating women, as well as formula-fed infants, have demonstrated a general trend that supplementation with dietary DHA is associated with better childhood outcomes on tests of visual and cognitive development over the first year of life. However, research to date has several methodological limitations, including concentrations of DHA supplementation that have been too low to emulate the in utero accretion of DHA, using single measures of visual acuity to make generalised assumptions about the entire visual system, and little attempt to match what we know about inadequate DHA and structural ramifications with how specific functions may be affected. The objective of this review is to consider the role of DHA in the context of visual processing with a specific emphasis on preterm infants and to illustrate how future research may benefit from marrying what we know about structural consequences to inadequate DHA with functional outcomes that likely have far-reaching ramifications. Factors worth considering for clinical neuropsychological evaluation are also discussed.     

Exploring Societal and Ethical Views of Nanotechnology REUs

Little previous research has examined attitudes about societal and ethical issues (SEI) among interns participating in research experience for undergraduate programs (REUs) in nanotechnology, thus neglecting an important population for understanding the burgeoning views of the next generation of nanotechnology researchers. This study surveyed a sample of interns (N?=?85) participating in the National Nanotechnology Infrastructure Network’s (NNIN) REU program during the summer of 2012. Our questions focused on interns’ experiences with education on ethical issues, as well as their attribution of responsibility for considering ethical issues, motivations to talk about ethical issues, and comfort level of discussing ethical issues with faculty, mentors, lab staff, and other REU students. Among key findings was that lab culture related to the extent to which REU interns felt comfortable discussing ethical issues. In addition, those who reported more discussions about ethical issues with their mentors were more likely to consider themselves as responsible for considering ethical issues. We conclude with recommendations and future research directions.     

“You Need to Stop Talking About This!”: Verbal Rumination and the Costs of Social Support

This study examined whether the type of support individuals receive when they are verbally ruminating affects their cognitive rumination (brooding), anxiety, and relationship satisfaction; 233 young adults were randomly assigned to be the subject, 233 others the confederate. The confederate was trained to provide “good support” or “poor support” to the subject who talked about a topic he/she had been verbally ruminating about recently. When individuals verbally ruminated and received poor support, they became more anxious and dissatisfied with the friendship. When individuals received good support, they were more satisfied with their friendship, but their anxiety was not significantly reduced. In addition, verbal rumination was directly associated with more brooding after the conversation, regardless of the type of support provided.     

Asymmetry and performance: toward a neurodevelopmental theory

Hemispheric asymmetry implies the existence of developmental influences that affect one hemisphere more than the other. However, those influences are poorly understood. One simple view is that asymmetry may exist because of a relationship between a mental process' degree of lateralization and how well it functions. Data scaling issues have largely prevented such investigations, but it is shown that scaling effects are minimized after correction for ceiling and floor effects. After correction, lateralization-performance correlations are pervasive. However, while some correlations are positive, others are negative, with the direction depending on the underlying lateralized process. Two hypotheses are proposed that can account for these relationships by pointing either to individual differences in maturation of the corpus callosum or to developmental limits encountered at different ages of childhood. Their investigation should contribute toward a neurodevelopmental theory of hemispheric asymmetry.     

When attention matters: The curious incident of the wandering mind

Attention plays an essential role in the construction of the mental models necessary to make sense of ongoing events. In this article, we consider the implications of temporary inattention during reading for the construction and updating of the situation model during text comprehension. We examined how self-reported mind wandering during reading relates to the online construction of the situation model of the narrative, which in this case involved the pseudonym used by a villain in a detective novella. In successful readers, mind wandering without awareness, referred to as zoning out, was less frequent when the text revealed a clue about the villain's identity. Additional analyses indicated that mind wandering interfered with the construction of the situation model independent of the participants' ability to retrieve factual information. The analysis of the temporal consequences of zoning out indicated that lapses had the greatest influence when they occurred early in the narrative. These results confirm the intuition that zoning out during reading is an indication that the construction of the situation model has gone awry, and underscore the fact that our ability to understand ongoing events depends on the ability to pay attention when it matters.     

Theoretical implications of quantitative properties of interval timing and probability estimation in mouse and rat

Although theoretical discussions typically assume that positive and negative reinforcement differ, the literature contains little unambiguous evidence that they produce differential behavioral effects. To test whether the two types of consequences control behavior differently, we pitted money‐gain positive reinforcement and money‐loss‐avoidance negative reinforcement, scheduled through identically programmed variable‐cycle schedules, against each other in concurrent schedules. Contingencies of response‐produced feedback, normally different in positive and negative reinforcement, were made symmetrical. Steeper matching slopes were produced compared to a baseline consisting of all positive reinforcement. This free‐operant differential outcomes effect supports the notion that that stimulus‐presentation positive reinforcement and stimulus‐elimination negative reinforcement are functionally “different.” However, a control experiment showed that the feedback asymmetry of more traditional positive and negative reinforcement schedules also is sufficient to create a “difference” when the type of consequence is held constant. We offer these findings as a small step in meeting the very large challenge of moving negative reinforcement theory beyond decades of relative quiescence.     

Cognitive and Personality Characteristics of Masculinity and Femininity Predict Wayfinding Competence and Strategies of Men and Women

Bem (1974) reconceptualized masculinity and femininity as independent and orthogonal constructs that both men and women possess to varying degrees. This perspective was used as a starting point to investigate whether the contributions of gender-typed characteristics can help to account for commonly observed gender differences in wayfinding (the ability to identify one’s current location and successfully navigate to an unseen location in the environment) favoring men. We further divided gender-typed characteristics into cognitive and personality characteristics to assess their separate influence on wayfinding and explored whether gender-typed characteristics predicted self-reported use of masculine wayfinding strategies (i.e., orientation strategies) and self-reported wayfinding competence. Participants were 452 college women and men in a southern U.S. public university. They completed the Gender-Stereotypic Characteristics questionnaire (Diekman and Eagly 2000), a social comparison questionnaire (created by the authors), a wayfinding strategy questionnaire (Lawton 1994), and a wayfinding competence questionnaire (Hegarty et al. 2002). For both men and women, higher masculine cognitive characteristics significantly correlated with greater use of orientation wayfinding strategies typical of men. For men, both higher masculine and feminine cognitive characteristics predicted better overall wayfinding competence whereas for women, only higher masculine cognitive characteristics predicted better overall wayfinding competence. For both men and women, higher feminine personality characteristics predicted poorer wayfinding competence. These results demonstrated the importance of considering cognitive and personality characteristics of masculinity and femininity in explaining individual differences in wayfinding.