SayWhen: An automated method for high-accuracy speech onset detection

Many researchers across many experimental domains utilize the latency of spoken responses as a dependent measure. These measurements are typically made using a voice key, an electronic device that monitors the amplitude of a voice signal, and detects when a predetermined threshold is crossed. Unfortunately, voice keys have been repeatedly shown to be alarmingly errorful and biased in accurately detecting speech onset latencies. We present SayWhen--an easy-to-use software system for offline speech onset latency measurement that (1) automatically detects speech onset latencies with high accuracy, well beyond voice key performance, (2) automatically detects and flags a subset of trials most likely to have mismeasured onsets, for optional manual checking, and (3) implements a graphical user interface that greatly speeds and facilitates the checking and correction of this flagged subset of trials. This automatic-plus-selective-checking method approaches the gold standard performance of full manual coding in a small fraction of the time.     

Spatial learning in pigs: effects of environmental enrichment and individual characteristics on behaviour and performance

This study investigated the effects of both environmental enrichment and individual behavioural characteristics on spatial cognitive capabilities of pigs, using a novel latent spatial learning paradigm based on Tolman’s detour experiments (1948). Pigs were housed either in ‘barren’ pens or in pens enriched with straw bedding from birth. Pigs were restrained in a Backtest at 10 and 17 days postpartum. Based on their escape behaviour in this test, which has been shown to reflect their behavioural style, six ‘high-resisting’(HR) and six ‘low-resisting’ (LR) pigs were selected from each housing environment (n = 24 in total). At 12 weeks of age, pairs of pen mates (LR and HR) were exposed to a maze three times (exploration trials). Pigs were then placed individually in the maze, and social reinstatement proved to be a strong incentive to find the exit leading to the home pen. We subsequently blocked the direct route to the exit, forcing animals to find a detour (memory test 1, MT1). This test was repeated once to investigate the relative improvement, i.e. detour learning (memory test 2, MT2). Housing condition and Backtest response strongly affected exploration patterns. In spite of this, no effects on performance during the subsequent memory tests were found. Performance was substantially improved in MT2, indicating that once a goal is apparent, pigs are able to solve a complex spatial memory task easily. In conclusion, social reinstatement provided a good incentive to complete a spatial task, and the substantial improvement in performance between MT1 and MT2 stresses the need for task complexity when testing spatial memory in pigs. Housing conditions or individual behavioural style did not affect spatial memory during MT1 or MT2. However, housing environment and behavioural style strongly affected explorative behaviour of pigs in an unfamiliar maze during both exploration trials and memory tests. This implicates that apparent effects of environmental enrichment on spatial learning and memory in pigs might reflect differences in explorative patterns rather than in cognitive processes.     

Working harder to obtain more snack foods when wanting to eat less

This study investigates individual differences in the reinforcing value of snack food. More specifically, it was investigated whether differences in restraint status are associated with differences in working for high-caloric snack food. Thirty-six unrestrained non-dieters, twenty restrained non-dieters and fifteen current dieters performed a concurrent schedules task in which they had the option to work for points for either snack food or fruit and vegetables. By progressively increasing the “price” of the snack foods (i.e., the amount of work required to obtain extra snack points) the relative reinforcing value of snack food was determined. As hypothesized, restrained non-dieters worked harder and current dieters worked less hard to obtain snack food as compared to unrestrained non-dieters.     

Assessment Center Graduate Selection: Decision Processes,Validity, and Evaluation by Candidates

In this contribution, results are presented of research on the predictive validity of a procedure for the career-oriented selection of graduates in The Netherlands. After selection on account of applicant letter, the selection procedure consists of four selective steps: interview with a ‘recruitment officer’, mental test, interview with line manager, and an assessment center comprising two situational exercises. Performance indicators investigated are present salary, average annual changes in function, appraisal of performance, appraisal of management potential, and average annual salary progression. We report on the relationships between the predictors, between the criteria, and between predictors and criteria. The assessment center, together with other steps from the selection procedure, appear to be valid for a number of performance indicators. The correlation between the overall assessment center rating and present salary, corrected for restriction in range, equals 0.55. Stepwise regression indicates that elements from all procedure steps contribute to the prediction of the criterion of average annual salary progression. The disturbing influence of possible ‘crown prince’ -effects on these results, are discussed. Also, the decision process taking place during the end meeting of the assessors is investigated. Finally, the evaluation of the procedure, both by accepted and by rejected candidates, is discussed. These and other results are compared to what is generally known about assessment centers.     

The use of ecological momentary assessment to test appraisal theories of emotion

Although appraisal theories have received strong empirical support, there are methodological concerns about the research, including biased recall, heuristic responding, ethical issues, and weak and unrealistic induction of emotions in laboratories. To provide a more ecologically valid test of appraisal theories, the authors used ecological momentary assessment, in which the emotions and appraisals of Singaporean police officers were measured online over the course of an ordinary workday. The research focused on happiness. Support was obtained for predictions, demonstrating the generalizability of appraisal theories to a nonlaboratory setting and circumventing the shortcomings of previously used methodologies. Also, evidence was obtained that happiness was reported primarily in association with a specific combination of 3 relevant appraisals: high pleasantness, high perceived control, and low moral violation.     

A new scale for use in non-clinical research into disinhibitive eating

The DIS, a 17-item questionnaire, was developed for subject selection in non-clinical research into disinhibitive eating. The DIS was designed to possess a tight and clear subscale structure, lessened impact of concern for dieting and explicit reference to self-esteem. Four subscales tapped the following themes: failed restriction, binge eating, weight fluctuations and self-esteem. DIS and the often used Restraint Scale (RS) were tested psychometrically among 269 female students from the Netherlands. Cronbach alpha was 0.88 for the DIS and 0.84 for the RS; correlation between the scales was 0.78. Factor analysis of the RS yielded the traditional two factors concern for dieting—weight fluctuations, whereas the DIS had a somewhat clearer four factors structure in accordance with its a priori subscales. On both the DIS and RS, high scorers were often currently dieting, and had higher Body Mass Index than low scorers. As to selection, DIS and RS differed in that partly different groups of individuals were selected when applying equally stringent cut-off scores. It was concluded that some of the psychometric and conceptual problems with the RS are alleviated by the DIS and that a next step is to behaviourally validate the DIS in disinhibition research.     

Methodological issues in prevention research: An introduction to the special issue

In recent years increased attention has been directed to prevention research as a means of solving the multitude of complex social and health problems which confront individuals and their societies. Abuse of substances, behavioral dysfunctions, violence, emotional disorders, educational failures, unwanted pregnancies and sexually transmitted diseases are but a few examples of these most difficult problems. As our recognition of the need for sound prevention strategies has grown, so has our sophistication in designing prevention research studies to evaluate the effectiveness of these new strategies. And that sophistication has brought new challenges, some of which are capable of stifling progress because of their complexity. This problem is certain to grow in importance as interventions with multiple components are used more frequently to meet the challenges of the complex social and health problems we face. This special issue evolved out of the recognition that prevention researchers are confronted by a myriad of difficult methodological issues which have inhibited progress in this area. The articles in the issue present innovative methodological solutions designed to overcome these problems so the field can move forward. Editor's Note: Dr. Edward Seidman edited Methodological Issues in Prevention Research while serving as Associate Editor for Methodology.