Determinants of following headway in congested traffic

This paper reports on results of a study undertaken in the UK aimed at investigating factors affecting the car following process. An understanding of the factors affecting this complex decision making process is essential to a wide range of theoretical issues including driver workload, capacity and the modeling of freeway flow, as well as practical applications such as the design of in-vehicle driver aids and assistance systems, many of which have direct relevance to increasing driver safety. The study used an instrumented vehicle to collect time dependent following data for a group of test drivers. Data was collected on two differing types of high speed road, using six primary subjects who drove a test vehicle, supplemented by data on 123 drivers that were observed following the test vehicle. Examination was made of how the time headway chosen by a driver is influenced by a range of situational variables commonly believed to effect behavior, with four main findings. Firstly, headway was found to change according to the type of vehicle being followed (i.e. subjects followed closer to trucks than to cars), secondly, little variation was found with changes in overall traffic flow, thirdly, little correlation was found with road type, and lastly a distinct day-to-day variation in individual behavior was observed.     

Research quality considerations for grounded theory research in sport & exercise psychology

ObjectivesThe aims of this article are: to examine the application of grounded theory in sport and exercise psychology; to locate such applications within broader grounded theory methodological debates and; to support the future use and evolution of the method in the field.MethodsA search of the four sport and exercise psychology journals with the highest impact factors in 2007 (Psychology of Sport and Exercise, Journal of Sport and Exercise Psychology, Journal of Applied Sport Psychology and The Sport Psychologist) using the search term “grounded theory” and the date parameters 2000–2008 was conducted. These articles were discussed in relation to research quality concerns for grounded theory at the micro- and macro-level.ResultsTwelve articles were returned from the search. At the micro-level, eight elements representing collective sufficient conditions for grounded theory were discussed, which only two of the twelve articles returned met. Examples of common mistakes in relation to these elements were provided from the twelve articles. At the macro-level, the ontological and epistemological debates surrounding variants of grounded theory were discussed. Only one of the twelve articles explicitly recognised that there are variants of grounded theory, whilst the potential to generate more generic formal theory, and thus make a wider contribution to bodies of knowledge, was not discussed in any of the articles.ConclusionsThere are research quality concerns regarding the application of grounded theory in sport and exercise psychology at the micro- and macro-level, largely linked to a lack of understanding of the methodology and its implementation. Suggestions to address this for editors, reviewers and authors are offered.     

The Effect of Manipulating Training Demands and Consequences on Experiences of Pressure in Elite Netball

Testing the efficacy of a pressure training framework (Stoker, Lindsay, Butt, Bawden, &; Maynard, 2016 Stoker, M., Lindsay, P., Butt, J., Bawden, M., &; Maynard, I. (2016). Elite coaches' experiences of creating pressure training environments. International Journal of Sport Psychology, 47(3), 262–281.[Web of Science ®] , [Google Scholar]), the present study investigated whether manipulating training demands and consequences altered experiences of pressure. Elite Netballers (M_age = 26.14 years) performed a Netball exercise in a randomized, within-subject design with four conditions: a control, consequences, demands, and demands plus consequences condition. Compared with the control, self-reported pressure was significantly higher in the consequences and demands plus consequences condition but not in the demands condition. The findings provide mixed support for manipulating demands and strong support for manipulating consequences as a means for producing pressure.     

Sport,Ethics, and Neurophilosophy

Abstract

The influence of neuroscience looms large today. In this introductory essay, we provide some context for the volume by acknowledging the expansion of applied neuroscience to everyday life and the proliferation of neuroscientific disciplines. We also observe that some individuals have sounded cautionary notes in light of perceived overreach of some claims for neuroscience. Then we briefly summarize the articles that comprise this volume. This diverse collection of papers represents the beginning of a conversation focused on the intersection of sport, ethics and neurophilosophy. As such, the essays also represent a new mode of interaction between philosophy and science with sport in the center of the discussion.     

Miss it and miss out: Counterproductive nonspatial attentional capture by task-irrelevant,value-related stimuli

Recent studies of visual search suggest that learning about valued outcomes (rewards and punishments) influences the likelihood that distractors will capture spatial attention and slow search for a target, even when those value-related distractors have never themselves been the targets of search. In the present study, we demonstrated a related effect in the context of temporal, rather than spatial, selection. Participants were presented with a temporal stream of pictures in a fixed central location and had to identify the orientation of a rotated target picture. Response accuracy was reduced if the rotated target was preceded by a “valued” distractor picture that signaled that a correct response to the target would be rewarded (and an incorrect response punished), relative to a distractor picture that did not signal reward or punishment. This effect of signal value on response accuracy was short-lived, being most prominent with a short lag between distractor and target. Impairment caused by a valued distractor was observed if participants were explicitly instructed regarding its relation to reward/punishment (Exps. 1, 3, and 4), or if they could learn this relationship only via trial-by-trial experience (Exp. 2). These findings show that the influence of signal value on attentional capture extends to temporal selection, and also demonstrate that value-related distractors can interfere with the conscious perception of subsequent target information.     

The rationality of informal argumentation: a Bayesian approach to reasoning fallacies

Classical informal reasoning "fallacies," for example, begging the question or arguing from ignorance, while ubiquitous in everyday argumentation, have been subject to little systematic investigation in cognitive psychology. In this article it is argued that these "fallacies" provide a rich taxonomy of argument forms that can be differentially strong, dependent on their content. A Bayesian theory of content-dependent argument strength is presented. Possible psychological mechanisms are identified. Experiments are presented investigating whether people's judgments of the strength of 3 fallacies--the argumentum ad ignorantiam, the circular argument or petitio principii, and the slippery slope argument--are affected by the factors a Bayesian account predicts. This research suggests that Bayesian accounts of reasoning can be extended to the more general human activity of argumentation.     

Hits and false positives in face matching: a familiarity-based dissociation

In recognition memory for unfamiliar faces, performance for target-present items (hits) does not correlate with performance for target-absent items (false positives), a result which runs counter to the more usual mirror effect. In this paper we examinesubjects' performance on fac e matching, a nd demonstrate no relationship-between performance on matching items and performance on nonmatching items. This absence of a mirror effect occurs for multidistractor, 1-in-10 matching tasks (Experiment 1) and for simple paired-item tasks (Experiment 2). In Experiment 3 we demonstrate that matching familiar faces produces a strong mirror effect. However, inverting the familiar faces causes the association to disappear once more (Experiment 4). We argue thatfamiliar and unfamiliar faces are represented in qualitatively different ways.     

Avoidance of emotional facial expressions in social anxiety: The Approach-Avoidance Task

The Approach–Avoidance Task (AAT) was employed to indirectly investigate avoidance reactions to stimuli of potential social threat. Forty-three highly socially anxious individuals (HSAs) and 43 non-anxious controls (NACs) reacted to pictures of emotional facial expressions (angry, neutral, or smiling) or to control pictures (puzzles) by pulling a joystick towards themselves (approach) versus pushing it away from themselves (avoidance). HSAs showed stronger avoidance tendencies than NACs for smiling as well as angry faces, whereas no group differences were found for neutral faces and puzzles. In contrast, valence ratings of the emotional facial expressions did not differ between groups. A critical discrepancy between direct and indirect measures was observed for smiling faces: HSAs evaluated them positively, but reacted to them with avoidance.     

Precision and power grip priming by observed grasping

The coupling of hand grasping stimuli and the subsequent grasp execution was explored in normal participants. Participants were asked to respond with their right- or left-hand to the accuracy of an observed (dynamic) grasp while they were holding precision or power grasp response devices in their hands (e.g., precision device/right-hand; power device/left-hand). The observed hand was making either accurate or inaccurate precision or power grasps and participants signalled the accuracy of the observed grip by making one or other response depending on instructions. Responses were made faster when they matched the observed grip type. The two grasp types differed in their sensitivity to the end-state (i.e., accuracy) of the observed grip. The end-state influenced the power grasp congruency effect more than the precision grasp effect when the observed hand was performing the grasp without any goal object (Experiments 1 and 2). However, the end-state also influenced the precision grip congruency effect (Experiment 3) when the action was object-directed. The data are interpreted as behavioural evidence of the automatic imitation coding of the observed actions. The study suggests that, in goal-oriented imitation coding, the context of an action (e.g., being object-directed) is more important factor in coding precision grips than power grips.     

Ovals of time: time-space associations in synaesthesia

We examine a condition in which units of time, such as months of the year, are associated with specific locations in space. For individuals with this time-space synaesthesia, contiguous time units such as months are spatially linked forming idiosyncratically shaped patterns such as ovals, oblongs or circles. For some individuals, each time unit appears in a highly specific colour. For instance, one of the synaesthetes we studied experienced December as a red area located at arms length to the left of their body. For the same individual May was a blue area located roughly at arms length to the right of their body. We studied four synaesthetes who report spatial associations for the months of the year. We found that the time-space associations experienced by these individuals were consistent across test-retest. In addition, month names directed visual attention to particular locations in space. For some synaesthetes, this directing of spatial attention was quite rapid-in accord with their reports that month names involuntarily bring to mind spatial locations.