Conflicts of interest: The implications of roadside advertising for driver attention

There is growing concern that roadside advertising presents a real risk to driving safety, with conservative estimates putting external distractors responsible for up to 10% of all road traffic accidents. In this report, we present a simulator study quantifying the effects of billboards on driver attention, mental workload and performance in Urban, Motorway and Rural environments. The results demonstrate that roadside advertising has clear adverse effects on lateral control and driver attention, in terms of mental workload. Whilst the methodological limitations of the study are acknowledged, the overriding conclusion is that prudence should be exercised when authorising or placing roadside advertising. The findings are discussed with respect to governmental policy and guidelines.     

Correlations between intelligence and components of serial timing variability

Psychometric intelligence correlates with reaction time in elementary cognitive tasks, as well as with performance in time discrimination and judgment tasks. It has remained unclear, however, to what extent these correlations are due to top–down mechanisms, such as attention, and bottom–up mechanisms, i.e. basic neural properties that influence both temporal accuracy and cognitive processes. Here, we assessed correlations between intelligence (Raven SPM Plus) and performance in isochronous serial interval production, a simple, automatic timing task where participants first make movements in synchrony with an isochronous sequence of sounds and then continue with self-paced production to produce a sequence of intervals with the same inter-onset interval (IOI). The target IOI varied across trials. A number of different measures of timing variability were considered, all negatively correlated with intelligence. Across all stimulus IOIs, local interval-to-interval variability correlated more strongly with intelligence than drift, i.e. gradual changes in response IOI. The strongest correlations with intelligence were found for IOIs between 400 and 900 ms, rather than above 1 s, which is typically considered a lower limit for cognitive timing. Furthermore, poor trials, i.e. trials arguably most affected by lapses in attention, did not predict intelligence better than the most accurate trials. We discuss these results in relation to the human timing literature, and argue that they support a bottom–up model of the relation between temporal variability of neural activity and intelligence.     

The lived experience of alopecia areata: A qualitative study

This study explored experiences of individuals living with alopecia areata (AA) and alopecia universalis (AU) and investigated their accounts of adjusting to, and coping with, such conditions. Whilst previous research has primarily focused on the adverse psychosocial impact of alopecia, this investigation used Interpretive Phenomenological Analysis to provide a more holistic perspective. Biographical interviews were undertaken with 12 participants (7 women; 5 men) diagnosed with alopecia for periods ranging between 2 and 49 years. Results revealed that strategies used by participants evolved over time and that there were clear gender differences. In the early stages, participants did not want to contemplate that their hair loss would be lasting and managed the condition via concealment. Later coping strategies reflected an embodied acceptance with participants managing the effects of AA/AU and becoming more optimistic about living with the condition. Limitations of the study are discussed as well as implications for patient care.     

Modifying law enforcement training simulators for use in basic research

Several approaches to using simulation as a method for teaching good judgment in the use of firearms by law enforcement officers and military personnel were investigated for their potential applications to research: the GAMMA Live Fire Video Training System, the FireArms Training Systems Simulator (FATS), and the Judgment Under Stress Training (JUST) simulator. Each instrument uses real-time, computer-controlled, life-sized projected video images of scenarios that may or may not present a threat, and handguns that fire real or simulated ammunition. The subjects respond to a sequence of “shoot/no-shoot” judgment scenarios resulting in data on judgment, reaction time, and accuracy. The JUST simulator was found to be more easily modifiable in capturing data on performance at microanalytic levels. Although true interactive simulations are not feasible with this system, this was not seen as a hindrance to its usefulness for research.     

Data-driven Processing and Priming Effects in a Word-fragment Completion Task

An experiment was designed to examine the role and importance of data-driven processing in an implicit memory task: Word-fragment completion. We investigated the effects of priming and manipulating the context in which the target words had been read. Three main results emerged. First, replicating MacLeod's experiment (1989), we found that there was a very small priming effect for words previously studied in a text. Second, the magnitude of the priming effect increased with the perceptual difficulty of information intake during reading. Third, these variations in priming for the texts were functionally independent of subjects' recall of the text read. These results suggest that data-driven processing plays a critical role in priming. They are consistent with the transfer-appropriate processing theory recently advocated by Roediger, Weldon, and Challis (1989).     

Stochastic processes and the guttman simplex

The problem of whether a precise connection exists between stochastic processes of the type considered in mathematical learning theory and the Guttman simplex is investigated. The approach is to consider a class of models that characterize the sequential properties of discrete data, and to derive a set of conditions which a model must satisfy in order to generate inter-trial correlationsr _ij with the ‘perfect simplex’ property:r _ik =r _ij r _jk for all trialsi<j<k. It is shown that the Chapman-Kolomogorov Equations provide a necessary and sufficient condition for this property to hold. It follows that a process which is Markovian in the errors and successes will have this property. It is also shown that, if certain reliability assumptions are introduced, then the all-or-none model has the simplex property if the appropriate correlation coefficients are corrected for attenuation. This research was supported by a grant from the United States Public Health Service, NIMH 07722.