Dutch engineering overseas: The creation of a modern irrigation system in Colonial Java

This article describes and analyses the development of modern irrigation in Java within the context of the establishment and transformation of the colonial state in the Dutch East Indies / Indonesia. In order to make this relationship comprehensible the concept “large technical system” has been adopted. The colonial socio-technical irrigation system was built between 1830 and 1942. Engineers, civil servants and agricultural experts were the main system builders and they formed specific coalitions practising specific irrigation approaches. After Indonesia gained its independence, the colonial irrigation system remained in existence and, consequently, irrigation engineering remained top-down, large-scale and focused on agricultural-technical management. He is involved in water control from historical and international points of view and also in the history of the Department of Public Works in the Dutch East Indies and Indonesia. He gained his doctorate in 1997 with the publication of De zegenrijke heeren der wateren. Irrigatie en staat op Java, 1832–1942 (“The Auspicious Lords of the Waters. Irrigation and the Colonial State in Java, 1832–1942”), Delft University Press. An English translation of his dissertation is forthcoming. He is currently working on a book on the history and the achievements of the Public Works Department in the Dutch East Indies.     

Oculomotor bias induced by number perception

Previous research with manual response methods has found evidence for an association between numbers and space. The present study investigated whether eye movements also show this association. Eye movement responses were recorded from 15 healthy participants as they categorized the digits 0-9 as odd or even. Responses were initiated faster to the left in response to small digits and faster to the right in response to large digits. Movement amplitudes were not systematically affected by either number magnitude or parity. These results provide further evidence for a spatially oriented "mental number line".     

Screening for Posttraumatic Stress Disorder: an evaluation of two self-report scales among crime victims

The validity of the Impact of Events Scale (IES) and the Posttraumatic Stress Disorder (PTSD) Symptom Scale, Self-Report version (PSS-SR) was examined among crime victims. Both instruments performed well as screeners for PTSD. For the IES, sensitivity ranged between .93 and 1.00; for the PSS-SR, sensitivity ranged between .80 and .90. Specificity for the IES ranged between .78 and .84 and for the PSS-SR ranged between .84 and .88. Some individual items from the 2 scales performed just as well as the total scales. The authors conclude that either of these short self-report instruments or their individual items are suitable as screeners for PTSD, specifically in settings where mental health professionals are unavailable. Cross-validation of these results is necessary because of the small sample size in this study.     

Editorial

Editorial Introduction

Editorial     

How Competent are Adolescent Bullying Perpetrators and Victims in Mastering Normative Developmental Tasks in Early Adulthood?

A substantive body of literature suggests that those involved in bullying as perpetrators but particularly victims are at greater risk for psychological maladjustment. In comparison, relatively little is known about associations between bullying-victimization and perpetration and mastery of early adult tasks in domains including romantic relationships, education, work, financial competence, and conduct. These links were tested using data from two Dutch cohorts (RADAR-young, n = 497, 43% girls; TRAILS, n = 2230, 51% girls) who reported on victimization and perpetration at age 11 (TRAILS) and 13 (RADAR-young) and mastery of developmental tasks in early adulthood. Unadjusted regression analyses suggested for both cohorts that perpetrators were less likely to abide the law and more likely to smoke. Victims in TRAILS were less competent in the domains of education, work, and finances, and more likely to smoke in RADAR-young. Adjusting for childhood demographics and child intelligence and including psychopathology in the prediction models substantially reduced the strength of associations between bullying involvement and later outcomes in both cohorts; although association were retained between victimization and welfare dependence and perpetration and crime involvement in TRAILS. Parental support did not buffer associations in either sample and neither were gender differences detected. Overall, findings underline that negative outcomes of bullying are not only a concern for victims but also for their perpetrators although involvement in bullying is not a stable predictor of mastery of developmental tasks when childhood demographics, child intelligence, and psychopathology are taken into account.     

Who can escape the natural number bias in rational number tasks? A study involving students and experts

Many learners have difficulties with rational number tasks because they persistently rely on their natural number knowledge, which is not always applicable. Studies show that such a natural number bias can mislead not only children but also educated adults. It is still unclear whether and under what conditions mathematical expertise enables people to be completely unaffected by such a bias on tasks in which people with less expertise are clearly biased. We compared the performance of eighth‐grade students and expert mathematicians on the same set of algebraic expression problems that addressed the effect of arithmetic operations (multiplication and division). Using accuracy and response time measures, we found clear evidence for a natural number bias in students but no traces of a bias in experts. The data suggested that whereas students based their answers on their intuitions about natural numbers, expert mathematicians relied on their skilled intuitions about algebraic expressions. We conclude that it is possible for experts to be unaffected by the natural number bias on rational number tasks when they use strategies that do not involve natural numbers.     

Self‐Concept Clarity in Adolescents and Parents: A Six‐Wave Longitudinal and Multi‐Informant Study on Development and Intergenerational Transmission

The purpose of this study was twofold: (a) to disentangle patterns of change and stability in self‐concept clarity (SCC) in adolescents and in their parents and (b) to examine processes of intergenerational transmission of SCC in families with adolescents. Participants were 497 Dutch families including the father (baseline M_age = 46.74), the mother (baseline M_age = 44.41), and their adolescent child (56.9% males; baseline M_age = 13.03). Each family member completed the SCC scale for six waves, with a one‐year interval between each wave. Latent growth curve analyses indicated that adolescent boys reported higher SCC than girls. Furthermore, fathers and mothers reported higher SCC than their children, and it increased over time. Indices of SCC rank‐order stability were high and increased from T1 to T2, T2 to T3, etc., for each family member, especially for adolescents. Multivariate latent growth curve analyses and cross‐lagged models highlighted a unidirectional transmission process, with fathers’ and mothers’ SCC influencing adolescents’ SCC. This result was not moderated by adolescent gender. These findings indicate that self‐concept clarity is transmitted from parents to children.     

Linking Item Response Model Parameters

With a few exceptions, the problem of linking item response model parameters from different item calibrations has been conceptualized as an instance of the problem of test equating scores on different test forms. This paper argues, however, that the use of item response models does not require any test score equating. Instead, it involves the necessity of parameter linking due to a fundamental problem inherent in the formal nature of these models—their general lack of identifiability. More specifically, item response model parameters need to be linked to adjust for the different effects of the identifiability restrictions used in separate item calibrations. Our main theorems characterize the formal nature of these linking functions for monotone, continuous response models, derive their specific shapes for different parameterizations of the 3PL model, and show how to identify them from the parameter values of the common items or persons in different linking designs.     

The Interplay of Self‐Certainty and Prosocial Development in the Transition from Late Adolescence to Emerging Adulthood

The transition from late adolescence to emerging adulthood is a period of the life span that offers young people the possibility to consolidate their self‐certainty and prosociality. Both aspects are of core importance for increasing personal and societal well‐being. The purpose of this longitudinal study was twofold: (i) to examine patterns of change and stability in self‐concept clarity and prosociality; and (ii) to unravel over time associations between these constructs in the transition from late adolescence to emerging adulthood. In addressing both aims, we explored the moderating effects of gender. Participants were 244 Dutch emerging adults (46% male; mean age at T1 = 16.73 years) who completed six waves of data collection (mean age at T6 = 22.7 years). Findings highlighted that (i) self‐concept clarity developed nonlinearly, with an initial decline from T1 to T2 followed by an increase thereafter, while prosociality increased linearly over time and both self‐concept clarity and prosociality were characterized by high rank‐order consistency; (ii) self‐concept clarity and prosociality were positively related over time, with the effect of prosociality on self‐concept clarity being stronger than the reciprocal effect of self‐concept clarity on prosociality. Gender differences were detected in mean levels of self‐concept clarity and prosociality (male participants reported higher self‐concept clarity and lower prosociality than female participants) but not in their developmental pathways nor in their reciprocal associations. Copyright © 2016 European Association of Personality Psychology