Design of micro-nanoscale bio-inspired hierarchical materials

In this article two mathematical models, force- or energy-based, are proposed for the design of nanoscale bio-inspired hierarchical materials, considering strong or weak interfaces, respectively. Simple formulas describing the dependence of strength, toughness and stiffness on the considered size scale are derived, taking into account toughening biomechanisms. A simple experimental comparison on a new two-level hierarchical grained material is also discussed.     

Indistinguishability, Choices, and Logics of Agency

This paper deals with structures ${\langle{\bf T}, I\rangle}$ in which T is a tree and I is a function assigning each moment a partition of the set of histories passing through it. The function I is called indistinguishability and generalizes the notion of undividedness. Belnap’s choices are particular indistinguishability functions. Structures ${\langle{\bf T}, I\rangle}$ provide a semantics for a language ${\mathcal{L}}$ with tense and modal operators. The first part of the paper investigates the set-theoretical properties of the set of indistinguishability classes, which has a tree structure. The significant relations between this tree and T are established within a general theory of trees. The aim of second part is testing the expressive power of the language ${\mathcal{L}}$ . The natural environment for this kind of investigations is Belnap’s seeing to it that (stit). It will be proved that the hybrid extension of ${\mathcal{L}}$ (with a simultaneity operator) is suitable for expressing stit concepts in a purely temporal language.     

Anticipatory Anxiety of an Imminent Economic Collapse

This article describes a prospective study of 1,200 participants, half of whom were offspring of trauma survivors, and their emotional symptom levels before and after the Corralito, an economic crisis that occurred in Argentina at the end of 2001. The authors report pre- and postcrisis data on anxiety and depression in a group of adult offspring of victims of the Dirty War (1976–1983) in an attempt to ascertain whether they are at greater risk than a control group for developing anxiety and depression in response to an economic crisis. The results indicated the offspring of war victims experienced greater emotional distress than the control subjects before, but not after the imposition of the Corralito.     

Dysfunctional Personal Experiences and Existential Dilemmas

This article presents a theoretical discussion of the results from the research, “An Existential Understanding of Anxiety: An Integration of the Ideas of May, Yalom, and Schneider.” It focuses on the development of dysfunctional experiences according to the theoretical perspectives of Rollo May, Irvin Yalom, and Kirk Schneider. Dysfunctional experiences emerge when human beings experience (implicitly or consciously) different existential dilemmas and are unable to make consistent decisions and confront the experience of anxiety that results from such contact. In this sense, dysfunctional experiences are not developed simply from the consciousness of existential givens, as suggested by Yalom (1980 Yalom , I. ( 1980 ). Existential psychotherapy . New York , NY : Basic Books . [Google Scholar]), but by the dialectical and paradoxical relationship with the following human dilemmas: life versus death, freedom versus determinisms, isolation versus intersubjectivity, meaning versus insignificancy, individuation versus adaptation, and sense of power versus impotence. This idea implies that anxiety and dysfunctional experiences could emerge, in daily life, from the need to take concrete decisions when faced with several possibilities or dilemmas, and not only from the awareness of those possibilities.     

Processing Italian Relative Clauses: Working Memory Span and Word Order Effects on RTs

In this study, the authors aim to clarify whether the subject–object asymmetry in relative clause comprehension is due to the use of parsing strategies (Active Filler Theory) or to a greater memory load generated by object sentences. Two experiments investigate how individual differences in working memory span may influence the reading times of relative sentences in Italian, a language characterized by a flexible structure. The results of Experiment 1 indicate that object extraction is more complex than subject extraction when sentences have a canonical structure. Furthermore, low-span participants have particular difficulties with object relative sentence comprehension. The results of Experiment 2 show that subject-relative clauses with uncanonical structures are more complex to understand than object-relative clauses, and low-span participants have more difficulties than high-span participants in elaborating both subject and object relative clauses. These data seem to be coherent with the Active Filler Theory.     

Role of Interactivity in Learning from Engineering Animations

This study examines the pedagogic value of incorporating sophisticated interactivity features into lessons on hand‐held devices. Engineering students (Experiment 1) and non‐engineering college students (Experiment 2) spent 5 min studying an animation showing a six‐step maintenance procedure for a mechanical device called a Power Take‐Off presented on an iPad. In both experiments, students who received high interactivity (i.e., rotation through dragging movements and zoom through pinching movements) reported higher interest but did not show better learning as compared to the low interactivity group (i.e., pause and continue buttons on the touch screen) or no interactivity group. Across two experiments, the interactivity hypothesis was supported in terms of increased interest but not supported in terms of improved learning. Thus, there was not support for the idea that increasing situational interest through high levels of interactivity primes deeper learning processes that produce better learning outcomes. Copyright © 2015 John Wiley & Sons, Ltd.     

Not All Alike: The Distinctive Impact of Voluntary and Involuntary Effort on Stress and Fatigue

Nowadays, little evidence exists on how variations in effort affect worker health, such as stress and fatigue, two important and undesirable outcomes for workers. Then, this paper analyses the impact of different dimensions of effort on stress and fatigue. To do so we use past literature to links the different effort dimensions on employee health. Concretely, the frameworks used in the paper are the one developed by Karasek and Theorell (1990), according to which the different combinations of work demands, competences in decision making and social support determine the stress employees suffer; and the effort-reward imbalance model (ERI Model) of Siegrist (Psychology 1:27–41, 1996). This provides a more sensitive model of stress, as it uses a combination of extrinsic effort and intrinsic effort as predictors of stress. Building on these theoretical models of job stress we argue that one main source of employee stress and fatigue is employee effort. Using a representative Spanish data set, our study reveals that different dimensions of effort have different consequences for workers. Whereas involuntary effort increases both stress and fatigue, voluntary effort entails a decrease in both.     

Uncovering unknown unknowns: Towards a Baconian approach to management decision-making

Bayesian decision theory and inference have left a deep and indelible mark on the literature on management decision-making. There is however an important issue that the machinery of classical Bayesianism is ill equipped to deal with, that of “unknown unknowns” or, in the cases in which they are actualised, what are sometimes called “Black Swans”. This issue is closely related to the problems of constructing an appropriate state space under conditions of deficient foresight about what the future might hold, and our aim is to develop a theory and some of the practicalities of state space elaboration that addresses these problems. Building on ideas originally put forward by Bacon (1620), we show how our approach can be used to build and explore the state space, how it may reduce the extent to which organisations are blindsided by Black Swans, and how it ameliorates various well-known cognitive biases.     

Improving Psychological Measurement: Does It Make a Difference? A Comment on Nesselroade and Molenaar (2016)

Nesselroade and Molenaar advocate the use of an idiographic filter approach. This is a fixed-effects approach, which may limit the number of individuals that can be simultaneously modeled, and it is not clear how to model the presence of subpopulations. Most important, Nesselroade and Molenaar's proposal appears to be best suited for modeling long time series on a few variables for a few individuals. Long time series are not common in psychological applications. Can it be applied to the usual longitudinal data we face? These are characterized by short time series (four to five points in time), hundreds of individuals, and dozens of variables. If so, what do we gain? Applied settings most often involve between-individual decisions. I conjecture that their approach will not outperform common, simpler, methods. However, when intraindividual decisions are involved, their approach may have an edge.