On the rate of gain of information in children

Previous studies of the development of information processing in children have frequently been methodologically suspect and inconclusive in outcome. A study was designed to overcome some of the difficulties encountered in earlier studies. Six boys and six girls at each year of age from 5 to 11 inclusive were tested for one week on a serial, numerals-keys choice reaction time task with 2, 4, and 8 alternatives. Results were consistent with Hick's (1952) law. Both reaction time (RT) and the rate of gain of information improved with age, but the intercept constant, a more labile index, did not. These findings suggest that development is largely restricted to the process of response selection within a 4-stage decomposition of RT. Girls consistently exhibited both faster RTs and higher rates of gain of information than boys. These sex differences are interpreted in relation to recent notions of cerebral maturation in males and females.     

Early use of decomposition for addition and its relation to base-10 knowledge

The early use of decomposition for addition has been linked to future mathematics achievement. The present study examined kindergartners' performance on addition problems, focusing on their use of the decomposition strategy and the factors related to the frequency with which they chose it. Single- and multi-digit addition problems were presented to kindergartners from US, Russia and Taiwan (N = 182). As expected, kindergartners used a variety of strategies to solve the problems. They were more likely to use decomposition on complex problems involving carryover or multi-digit operations. Critically, their use of base-10 decomposition was related to their knowledge of base-10 number structure. These relations were similar across all three nations. Implications for understanding mathematical development and designing early mathematics instruction are discussed.     

Deviant Research: Deception,Male Internet Escorts,and Response Rates

Some social scientists who study deviant groups assume that it is necessary to use deception in order to avoid the bias associated with the decision of some subjects to not participate in such studies. Selective non-participation can lead to low response rates and, thereby, adversely affect the representativeness of the sample. This study directly tests for a differential in response rates to data gathered from an e-mail request for information on male-for-male escort fees sent by a sociologist with data gathered from an e-mail that appeared to be from a potential client asking for rates. Response rates for the social science and “client” e-mails are 15% and 60%, respectively.     

A meta-analysis of the prevalence and usage of the personality disorder not otherwise specified (PDNOS) diagnosis

The primary aim of the current study was to determine the prevalence and usage of the diagnosis of personality disorder not otherwise specified (PDNOS). As a secondary objective, this study explores the impact of assessment method and definition of PDNOS on observed prevalence. A meta-analysis is reported of 51 studies reporting separate rates for the overall prevalence of specific personality disorders and PDNOS. The best estimate of the absolute prevalence of PDNOS in patient samples is in the range of 8 to 13% and the best estimate of the relative prevalence of PDNOS (i.e., prevalence of PDNOS divided over the overall Axis II prevalence excluding PDNOS) is in the range of 21-49%. In structured interview studies PDNOS is the third most frequently used personality disorder diagnosis, whereas in nonstructured interview studies, PDNOS is often the single most frequently used diagnosis. PDE/IPDE yielded higher PDNOS prevalences than either the SCID or SIDP. Only slightly more than half of the studies provided an operational definition of PDNOS, and the most frequently occurring definition is "mixed" personality disorder. PDNOS would perhaps be the most frequently used diagnosis if it was used in a manner consistent with its definition in DSM-IV. The clinical relevance of future classification, assessment, and research could substantially benefit from validated, explicit, and uniform guidelines for the assessment of PDNOS.     

The effect of physical restraint on behavior under the differential-reinforcement-of-low-rate schedule

Previous studies have identified and manipulated collateral behavior to assess the effect of collateral behavior on performance under the differential-reinforcement-of-low-rate (DRL) schedule. However, conclusions could not be applied to subjects not observed to engage in collateral behavior. The present study used a technique that prevented the occurrence of the types of collateral behavior typically observed in the pigeon. This technique did not require the identification of collateral behavior in the subjects. The exclusion of the types of collateral behavior typically observed in pigeons resulted in higher response rates and lower reinforcement rates under large DRL values but had no effect at lower DRL values. It was concluded that collateral behavior is necessary for low response rates and high reinforcement rates under large DRL values.     

Using the Criterion-Predictor Factor Model to Compute the Probability of Detecting Prediction Bias with Ordinary Least Squares Regression

The study of prediction bias is important and the last five decades include research studies that examined whether test scores differentially predict academic or employment performance. Previous studies used ordinary least squares (OLS) to assess whether groups differ in intercepts and slopes. This study shows that OLS yields inaccurate inferences for prediction bias hypotheses. This paper builds upon the criterion-predictor factor model by demonstrating the effect of selection, measurement error, and measurement bias on prediction bias studies that use OLS. The range restricted, criterion-predictor factor model is used to compute Type I error and power rates associated with using regression to assess prediction bias hypotheses. In short, OLS is not capable of testing hypotheses about group differences in latent intercepts and slopes. Additionally, a theorem is presented which shows that researchers should not employ hierarchical regression to assess intercept differences with selected samples.     

The use of decomposition in probability assessments of continuous variables

In this study, decomposition is used as a tool for the assessment of continuous probability distributions. The goal of using decomposition is to obtain better calibrated probability distributions by expressing a variable as a known function of several component variables. Three target quantities were used in the study. Each was assessed holistically and using two different decompositions. Thus, each subject provided three distributions for each of the three target quantities. The recomposed assessments were compared to holistic assessments. The distributions obtained using decomposition were found to be much better calibrated than those obtained holistically. Two methods of aggregating distributions from multiple subjects were also examined. One involves aggregating (averaging) distributions before recomposing while the second method involves recomposing and then averaging distributions for the target variable. The second method was found to be slightly better, although both showed better calibration than was found in the individual assessments.     

The Influence of Major Life Events and Personality Traits on the Stability of Affective Well-Being

The current study examines the influence of major life events compared to personality traits on the stability of affective well-being (AWB). It is shown how the decomposition of autocovariances can be used to estimate the degree of stability that is due to life events and personality traits. The approach is illustrated by an analysis of data from a nationally representative Australian sample with four consecutive waves of measurement. The autocovariances of positive and negative mood served as indicators of the stability of AWB. Big five personality traits as well as 21 major life events were used as predictor variables in a path analysis. In comparison to previous studies, this allowed to directly compare the effects of multiple events to the influence of personality traits in a longitudinal design. Results indicated medium stability coefficients for AWB. Ca. 10 % of the autocovariances could be accounted for by life events and about 20 % by personality traits. Both types of predictors together accounted for about 30 %. Among personality traits, emotional stability followed by extraversion had the highest effects. Among life events “financial worsening” and “serious personal injury/illness” had the highest effects. Additionally, life events were significantly correlated with personality traits as well as with other life events. In a next step, it might be interesting to compare the influence of Big Five personality traits and stable life circumstances on the stability of the cognitive well-being component, using a similar statistical procedure. Also, as the number of variables in large panel studies is limited, results should be complemented by more in-depth studies, favourably using multi-method approaches.     

Models of acceleration and deceleration rates on a complex two-lane rural highway: Results from a nighttime driving experiment

This study aimed to model driver’ deceleration or acceleration rates on a complex two-lane rural highway when approaching or departing horizontal curves under nighttime driving conditions. The data used in the study were from a field experiment conducted in Pennsylvania. Research participant speeds were continuously tracked along the experimental roadway. The deceleration and acceleration rate models when approaching and departing horizontal curves were treated as a uni-directional recursive system to account for the effects of upstream rates on deceleration and acceleration rates. This system was estimated using seemingly unrelated regression with random effects to account for the contemporaneous correlation across the two equations. Research participants were included in the model as random effects while several geometric roadway design features along the experimental roadway were included as fixed effects in the model. The results indicate that the explanatory variables associated with deceleration or acceleration rates when approaching or departing horizontal curves in the present experiment included several geometric design variables, such as curve direction, curve radius, horizontal curve length, and a vertical curve index. The deceleration and acceleration rates approaching and departing horizontal curves along the complex, two-lane rural highway included in this study have a larger range than those in past research studies of two-lane rural highways.     

The impact of epidemic, war, prohibition and media on suicide: United States, 1910-1920.

The paper utilizes a natural experiment approach to estimate the impact of exogenous social and political events on suicide behavior in the United States between 1910 and 1920. The study is concerned with determining the impact of World War I, the great Influenza Epidemic, and the prohibition experiment on suicide. Estimating the monthly population in the United States registration area from 1910 to 1920, monthly suicide and mortality rates are computed. A time-series model is postulated, and second-order autoregressive estimates are used to determine the impact of the independent variables in the model. It is concluded that World War I did not influence suicide; the Great Influenza Epidemic caused it to increase; and the continuing decline in alcohol consumption between 1910 and 1920 depressed national suicide rates. Further individual-level aggregate studies are needed to confirm the findings of the study.     

Examining mental health symptoms in male and female incarcerated juveniles

Varying risk factors for both incarceration and mental health diagnoses have been identified for female juveniles, highlighting the need for gender-specific assessments and treatment protocols. The purpose of this study is to determine how the prevalence rates of mental health symptoms differ in male and female juvenile offenders. It was hypothesized that the prevalence rates would be greater for females than males. This study found significant differences between males and females on several clinical scales. These findings are consistent with past studies that have identified differences in mental health symptoms between genders.     

Simulation of complex survival distributions

This paper describes a method for generating sample survival distributions from a hypothetical population, as would be required for running Monte Carlo simulations. The method is based on the concept of a quincunx. Cases are entered into a life table and allowed to drop out or die during each interval with probabilities that mirror the hypothetical population. By repeating this process many times and tracking the results, the researcher is able to study the sampling distribution of effect size indices and test statistics, and can generate empirical estimates of power and precision for planned studies. Unlike other methods that are commonly used for this purpose, the model proposed here allows the researcher to define a population in which the hazard rates and/or attrition rates vary substantially from one time point to the next, as may be the case in clinical trials or studies of processing times. The method requires less than 100 lines of code and runs some 10,000 simulations per hour on a microcomputer.     

Debiasing Using Decomposition: The Case of Memory‐Based Credit Card Expense Estimates

This article develops a conceptual framework to examine how consumers incorporate memory‐based and context‐based cues in estimating past and future credit card expenses. Focusing on memory‐based information, in this framework we suggest that past credit card expenses may be recalled as holistic totals or episodic individual expenses depending on the accessibility of each form of expense. We tested the conceptual framework with 3 studies. Study 1 showed that the recency of past expenses and frequency of credit card usage moderated the extent to which past expenses were used in estimating future expenses. Study 1 also showed that self‐awareness of estimation bias affected consumers’ estimates of future expenses. Study 2 showed that a decomposition strategy (unbundling a total into subcategories), which serves to make episodic individual expenses more accessible, was effective in reducing sampling‐based bias. Study 3 provided a validity check and showed that decomposition cues reduced estimation errors and affected estimates of future expense. In this article, we demonstrate the manner in which memory‐based information is used to make estimates, and we also demonstrate the effectiveness of decomposition as a debiasing technique for past and future estimates.     

The neural basis of obligatory decomposition of suffixed words

Recent neurolinguistic studies present somewhat conflicting evidence concerning the role of the inferior temporal cortex (IT) in visual word recognition within the first 200 ms after presentation. On the one hand, fMRI studies of the Visual Word Form Area (VWFA) suggest that the IT might recover representations of the orthographic form of words. On the other hand, influential MEG studies of responses from the occipito-temporal regions around 150 ms post-stimulus onset indicate recognition of letters as opposed to symbols but not a sensitivity to statistical properties of letter strings associated with word form representations. Recent MEG experiments support the position that the IT does represent the visual word forms of morphemes and performs morphological decomposition modulated by the statistical relations between morphemes by 170 ms post presentation (at the M170 response). Responses to heteronyms show that the M170 does not make contact with the mental lexicon where word forms are connected to meanings. We report here an MEG study of pseudo-affixed words like brother, which masked priming studies have shown are decomposed in recognition. If the M170 response from IT does index obligatory morphological decomposition based on visual word forms but not lexical entries, we should find that the statistical relation between pseudo-stem and pseudo-suffix modulates the M170 for pseudo-affixed words, as for truly affixed words. The results of this experiment confirm this prediction. In addition, surface form frequency for these words also modulates the M170, providing some support for dual route recognition for words for which decomposition is a garden path.     

Reading Rate in Informational Text: Norms and Implications for Theory and Practice in the Primary Grades

The purpose of this study was to explore reading rates in informational text for children in the primary grades (1–3) by analyzing a large, preexisting statewide dataset (n?=?21,005). The results indicated that children in the primary grades read informational text at approximately two-thirds the rates that would be anticipated based on previous studies, and that these reading rates increased sporadically and slowly over the course of the school year. In addition, when cut scores or minimum rates from previous studies were applied to this sample, one-half to three-fourths of all students were identified as at-risk. Alternative norms for reading rate in informational text in grades 1–3 are provided, and implications for theory and practice are discussed.     

Citizens Coping as Soldiers: A Review of Deployment Stress Symptoms Among Reservists

The present study provides a summary of studies examining the prevalence of posttraumatic stress (PTSD) and related symptoms among reserve personnel deployed during Operations Enduring Freedom and Iraqi Freedom. The few extant studies showed that in-theater and shortly after returning from deployment, reserve and active duty personnel had similar rates of PTSD and related symptoms. Sometime after deployment, reserve personnel reported higher rates of PTSD and related symptoms than active duty personnel. A work stress model is used to develop several possible explanations of findings, having implications for practices to reduce stress symptoms among reservists and for improving research and theory of future studies examining PTSD and related symptoms among reservists.     

The Change in Suicide Rates between 2002 and 2011 in China

Chinese suicide rates have been reported in various studies in the past two decades, but few of them were based on national data. The most recent mortality data (2002–2011) provided by the China Ministry of Health and the detailed census data provided by the National Population Census were used in this study. We calculated the age‐, gender‐, and region‐specific suicide rates and their trends in the past 10 years between 2002 and 2011. The overall suicide rates in China decreased during the study period. The rural/urban ratio of the suicide rates has been significantly reduced from the ratio in the 1990s, and male suicide rates have exceeded those of females. Age was positively associated with suicide rates without the two peaks found in the suicide rates over 20 years ago. The Chinese suicide rates have significantly declined in the past decade, with withering of the unique suicide rate patterns previously found in Chinese suicides about 20 years ago.     

The deterrent effect of capital punishment during the 1950s

This investigation examines the deterrence hypothesis of an inverse relationship between state execution rates and homicides. Although this question has received some attention in recent studies, the findings of these investigations are mixed. Cross-sectional analyses of states have typically shown execution and homicide rates to be positively associated, while at least two national time-series studies report support for the deterrence hypothesis. To test whether these divergent findings are result of the two different methodologies employed (cross-sectional vs. time-series), a methodology that combines the strengths of each is used in the present study. For the period 1950 to 1960, we examine cross-sectionally for states the relationship between changes in execution rates and changes in murder rates. This analysis does not find support for the deterrence argument for the certainty of the death penalty when a number of models of the execution rate--murder rate relationship are considered, and when a variety of imprisonment and socio-demographic factors are considered as control variables.     

Testing the indifference between a binary lottery and its edited components using observed estimates of variability

Past studies have shown inconsistent conclusions on the empirical validity of the duplex decomposition assumption that Luce proposed (1997). The duplex decomposition assumption states that a person would feel indifferent between playing a mixed (gain and loss outcomes) lottery and playing two lotteries simultaneously or successively where one lottery is the gain part and the other lottery is the loss part of the original mixed lottery. The current study tested this assumption by investigating the equality between the certainty equivalent of a binary lottery, CE (BL), and the certainty equivalent of the duplex decomposed lottery, CE (DDL), while controlling for the response variability in the estimated CEs. The results from two experiments showed that for 69% of responses, the difference between the CE (BL) and CE (DDL) was smaller than or equal to the response variability in estimating CEs, implying that duplex decomposition cannot be rejected for a majority of responses. The size of response variability in estimated CEs was discussed.     

聚焦词素语义加工的时间轴——先形后义还是形义并行?

目前学术界在词素的认知加工这一问题上存在两种观点.“先形后义”激活论认为词素加工首先经历词形分离,然后才能激活词素语义;“形义并行”激活论则认为上述两种加工同时发生.它们争论的焦点在于词素语义加工发生的阶段.“先形后义”有两种可能:词素形、义激活均发生于前词汇阶段,但形的激活发生更早些;或词素形的激活发生在前词汇阶段,而义的激活发生在后词汇阶段.“形义并行”则只有一种可能:词素形与义在前词汇阶段同时得到激活.两派观点均有相应的实证和理论支持(前词汇和后词汇模型).未来研究需解决研究范式及理论发展方面的问题.