On the philosophy of psi

In Naming and Necessity, Kripke argues that intuitions about what is possible play a limited, but important, role in challenging philosophical theses, counting as evidence against them only if they cannot be reconstrued as intuitions about something else, compatible with the thesis in question. But he doesn't provide clear guidelines for determining when such intuitions have been successfully reconstrued, leading some to question their status as evidence for modal claims. In this paper I focus on some worries, articulated by Michael Della Rocca, about whether modal intuitions can be evidence for claims about essential properties, and argue that there is a way of viewing the role of modal intuition in philosophical argument that can preserve their evidential force.     

Increased forefoot loading is associated with an increased plantar flexion moment

The aim of this study was to identify the cascade of effects leading from alterations in force generation around the ankle joint to increased plantar pressures under the forefoot. Gait analysis including plantar pressure measurement was performed at an individually preferred and a standardized, imposed gait velocity in diabetic subjects with polyneuropathy (n = 94), without polyneuropathy (n = 39) and healthy elderly (n = 19). The plantar flexion moment at 40% of the stance phase was negatively correlated with the displacement rate of center of pressure (r = ?.749, p < .001 at the imposed, and r = ?.693, p < .001 at the preferred gait velocity). Displacement rate of center of pressure was strongly correlated with forefoot loading (r = ?.837, p < .001 at the imposed, and r = ?.731, p < .001 at the preferred gait velocity). People with a relatively high plantar flexion moment at 40% of the stance phase, have a faster forward transfer of center of pressure and consequently higher loading of the forefoot. This indicates that interventions aimed at increasing the control of the roll-off of the foot may contribute to a better plantar pressure distribution.     

Cognitive biases and alcohol use in adolescence and young adulthood: The moderating role of gender,attentional control and inhibitory control

The present study investigated the cross-sectional associations between cognitive biases (i.e., attentional bias and approach bias) and alcohol use and investigated the moderating role of gender, attentional control and inhibitory control. The sample consisted of 94 adolescents and young adults (52.1% boys) between 15.3 and 20.8 years old (M_age = 18.0, SD = 1.1) who reported drinking alcohol in the past three months. A stronger approach bias was related to higher alcohol use, albeit only among boys. Furthermore, the association between attentional bias and alcohol use was moderated by attentional control; the lowest alcohol use was found in adolescents with low attentional bias and high attentional control, suggesting protective effects of both variables. The present study replicates and extends the results of studies on cognitive biases and addiction in adolescence and young adulthood.     

Relationship enhancement with premarital dyads: A six-month follow-up

Abstract

The purpose of the present study was to assess the short-term and longterm effectiveness of relationship enhancement on the self-disclosure and empathy skills of premarital dating couples. Nineteen couples were given the Guerney Relationship Enhancement Program over an eight week period, while 18 other couples were given a lecture/discussion program on relationship development. Behavioral assessments of self-disclosure and empathy skill levels were taken prior to training, immediately following training, and six months after training. Results indicated that from both pretest to posttest and pretest to follow-up, the relationship enhancement couples, relative to the lecture/discussion couples, demonstrated a significant increase in both self-disclosure and empathy skill levels. Discussion centers on the implications of the durability of the skills learned as well as on suggestions for future research on skill generalization to social interactions with others.     

Overgeneral autobiographical memory predicts changes in depression in a community sample

This study investigated whether overgeneral autobiographical memory (OGM) predicts the course of symptoms of depression and anxiety in a community sample, after 5, 6, 12 and 18 months. Participants (N = 156) completed the Autobiographical Memory Test and the Depression Anxiety Stress Scales-21 (DASS-21) at baseline and were subsequently reassessed using the DASS-21 at four time points over a period of 18 months. Using latent growth curve modelling, we found that OGM was associated with a linear increase in depression. We were unable to detect changes over time in anxiety. OGM may be an important marker to identify people at risk for depression in the future, but more research is needed with anxiety.     

Conceptual and Procedural Knowledge During Strategy Construction: A Complex Knowledge Systems Perspective

ABSTRACT

This article elaborates a new direction for studying the construction of novel strategies that enables researchers to model the conceptual underpinnings of students' observable strategic actions during episodes of mathematical problem solving. The nature of the relationship between conceptual and procedural knowledge has been persistently debated for decades. Recently, there has been mounting empirical evidence that conceptual and procedural knowledge can develop by mutual bootstrapping in a bidirectional and iterative fashion (e.g., Rittle-Johnson & Schneider, 2014 Rittle-Johnson, B., & Schneider, M. (2014). Developing conceptual and procedural knowledge of mathematics. In R. C. Kadosh & A. Dowker (Eds.), Oxford handbook of numerical cognition (pp. 1102–1118). Oxford: Oxford University Press. [Google Scholar]). However, the very constructs of conceptual and procedural knowledge (especially procedural knowledge) have been critiqued for inconsistency in definition and lack of operationalization (Star, 2007 Sherin, B. L. (1996). The symbolic basis of physical intuition A study of two symbol systems in physics instruction (Doctoral dissertation). University of California, Berkeley. [Google Scholar]). The analysis in this article addresses this critique by modeling the diverse forms of conceptual and procedural knowledge needed to implement a strategy as a complex knowledge system: a strategy system. Furthermore, the strategy system model is used to elaborate processes of mutual bootstrapping between conceptual and procedural knowledge at a moment-by-moment time scale. The strategy system model builds upon the Knowledge in Pieces epistemological perspective (diSessa, 1993 diSessa, A. A. (1993). Toward an epistemology of physics. Cognition and Instruction, 10(2–3), 105–225. doi:10.1080/07370008.1985.9649008[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]), and coordination class theory in particular (diSessa & Wagner, 2005 diSessa, A. A., & Wagner, J. F. (2005). What coordination has to say about transfer. In J. P. Mestre (Ed.), Transfer of learning from a modern multidisciplinary perspective (pp. 121–154). Greenwich, CT: Information Age Publishing. [Google Scholar]). Both the theoretical notion of a strategy system and the bidirectional model of mutual bootstrapping between conceptual and procedural knowledge are illustrated using data from a case study of a pre-algebra student who iteratively refined a procedure for solving algebra word problems. The strategy system model highlights the complexity of both strategies and concepts and offers a window into what can be learned by students during strategy construction processes.     

A Meta-Analysis of the Impact of Situationally Induced Achievement Goals on Task Performance

The purpose of this research was to meta-analyze studies which experimentally induced an achievement goal state to examine its causal effect on the individual’s performance at the task at hand, and to investigate the moderator effects of feedback anticipation and time pressure. The data set comprised 19 papers, 79 individual effect sizes, and 3,482 participants. Performance measures represented task performance across a variety of tasks. The findings indicate that relative to avoidance goals (either performance-avoidance goals or mastery-avoidance goals), approach goals (either mastery-approach goals or performance-approach goals) enhance task performance. Furthermore, relative to performance-approach goals, mastery-approach goals lead to better performance, particularly when individuals do not anticipate feedback and when there is no time pressure. Implications and future directions for research are discussed.     

Flexible Mediation Analysis in the Presence of Nonlinear Relations: Beyond the Mediation Formula

In the social sciences, mediation analysis has typically been formulated in the context of linear models using the Baron &; Kenny (1986) Baron, R. M. and Kenny, D. A. 1986. The moderator-mediator variable distinction in social psychological research: Conceptual, strategic and statistical considerations. Journal of Personality and Social Psychology, 51: 1173–1182. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] approach. Extensions to nonlinear models have been considered but lack formal justification. By placing mediation analysis within the counterfactual framework of causal inference one can define causal mediation effects in a way that is not tied to a specific statistical model and identify them under certain no unmeasured confounding assumptions. Corresponding estimation procedures using parametric or nonparametric models, based on the so-called mediation formula, have recently been proposed in the psychological literature and made accessible through the R-package mediation. A number of limitations of the latter approach are discussed and a more flexible approach using natural effects models is proposed as an alternative. The latter builds on the same counterfactual framework but enables interpretable and parsimonious modeling of direct and mediated effects and facilitates tests of hypotheses that would otherwise be difficult or impossible to test. We illustrate the approach in a study of individuals who ended a romantic relationship and explore whether the effect of attachment anxiety during the relationship on unwanted pursuit behavior after the breakup is mediated by negative affect during the breakup.     

One ‘knows’: self-rated health and telomere length among ex-prisoners of war

Abstract

Objective: Ill-health and early mortality are amongst the most significant ramifications of trauma. Furthermore, trauma alters the subjective perception and experience of the body. The aim of this study is to examine the extent to which deteriorations in perceived health among traumatised individuals are associated with cellular health as manifested in telomere length.

Methods: Specifically, 88 former prisoners of war (ex-POWs) evaluated their health (self-rated health; SRH) at 18 (T1), 35 (T2) and 42 (T3) years after the war, and were assessed for telomere length at T3. Health behaviour, BMI, morbidity and PTSD were also examined at T3.

Results: The findings demonstrated that SRH was cross-sectionally correlated with telomere length. Furthermore, a significant sequential indirect effect was found, in which worse SRH in T1 was associated with shorter telomere length at T3, through worse SRH at T2 and at T3.

Conclusions: These findings demonstrate that long-term deteriorations in the subjective evaluations of health are implicated in actual cellular health among individuals exposed to trauma.