Handler beliefs affect scent detection dog outcomes

Our aim was to evaluate how human beliefs affect working dog outcomes in an applied environment. We asked whether beliefs of scent detection dog handlers affect team performance and evaluated relative importance of human versus dog influences on handlers’ beliefs. Eighteen drug and/or explosive detection dog/handler teams each completed two sets of four brief search scenarios (conditions). Handlers were falsely told that two conditions contained a paper marking scent location (human influence). Two conditions contained decoy scents (food/toy) to encourage dog interest in a false location (dog influence). Conditions were (1) control; (2) paper marker; (3) decoy scent; and (4) paper marker at decoy scent. No conditions contained drug or explosive scent; any alerting response was incorrect. A repeated measures analysis of variance was used with search condition as the independent variable and number of alerts as the dependent variable. Additional nonparametric tests compared human and dog influence. There were 225 incorrect responses, with no differences in mean responses across conditions. Response patterns differed by condition. There were more correct (no alert responses) searches in conditions without markers. Within marked conditions, handlers reported that dogs alerted more at marked locations than other locations. Handlers’ beliefs that scent was present potentiated handler identification of detection dog alerts. Human more than dog influences affected alert locations. This confirms that handler beliefs affect outcomes of scent detection dog deployments.     

The True Self and Psychological Health: Emerging Evidence and Future Directions

A variety of philosophical and psychological perspectives converge to suggest that a happy and meaningful life is the product of living in accord with one’s true self. This idea similarly appears throughout literature, film, and folk wisdom. The current paper examines both theoretical and lay conceptions of the true self and reviews the empirical evidence that supports its role in psychological health, with a particular emphasis on current research that demonstrates that both the accessibility and ease of thinking about one’s true self‐concept is associated with the experiences of meaning and satisfaction. The merits of different approaches to defining the true self, measurement issues, and directions for future research are discussed.     

Older readers can be distracted by embellishing graphics in text

In most research on graphics in text students learn the content for a test (e.g., Mayer, 2002). The present study examined whether one of the principles from that literature, namely the deleterious effect of extraneous graphic information, would apply to adults who were consulting a leaflet to answer questions. The study used a mixed factorial design with 48 participants from three age bands (young-adult, young-old, old-old). Participants used two leaflets to answer questions, one without graphics and the other with either extraneous embellishing or supportive explanatory graphics. Relative to leaflets without graphics, the old-old participants were significantly slower finding information when leaflets contained embellishing but not explanatory graphics. The graphics had no effect on the other age groups. These findings suggest that either the reading task or the thematic relevance of the extraneous graphics may limit their negative effects for most adults but that negative effects recur for older readers.     

Is phonological short-term memory related to phonological analysis stages in auditory sentence processing?

Despite extensive research, the role of phonological short-term memory (STM) during oral sentence comprehension remains unclear. We tested the hypothesis that phonological STM is involved in phonological analysis stages of the incoming words, but not in sentence comprehension per se. We compared phonological STM capacity and processing times for natural sentences and sentences containing phonetically ambiguous words. The sentences were presented for an auditory sentence anomaly judgement task and processing times for each word were measured. STM was measured via nonword and word immediate serial recall tasks, indexing phonological and lexicosemantic STM capacity, respectively. Significantly increased processing times were observed for phonetically ambiguous words, relative to natural stimuli in same sentence positions. Phonological STM capacity correlated with the size of this phonetic ambiguity effect. However, phonological STM capacity did not correlate with measures of later semantic integration processes while lexicosemantic STM did. This study suggests that phonological STM is associated with phonological analysis processes during sentence processing.     

Search Strategies in Syntactic Reanalysis

We first consider the nature of syntactic reanalysis, paying particular attention to questions about whether and how it differs from the construction of an initial analysis, such as whether it is encapsulated or whether alternatives are considered in parallel or not. We then outline different strategies that the processor may use in reanalysis, and review the relevant evidence. We show that our experimental evidence is compatible with an encapsulated serial search strategy.     

Patterns of cognitive ageing

Neuroanatomical evidence suggests that normal ageing affects some brain areas, and the “local” functions they support, earlier and more severely than others. Changes appear to be especially marked in the hippocampus, temporal association and prefrontal cortex. Evidence from classical neuropsychological studies suggests that these brain areas are associated with memory and “executive” functions, respectively. We may, therefore, expect that tests purported to measure these functions may be disproportionately affected in old age and that there may be evidence for some separation of these functions even within neurologically normal populations. What we also know, however, is that measures reflecting general fluid ability also decline with increasing age, so any hypothesis relating to specific “local” deficits must acknowledge and account for any “globar” changes in performance. Volunteers (n=162) aged between 60–80 years who had completed the Cattell and Cattell Culture Fair Intelligence Test (CCF) completed the Cambridge Automated Neuropsychological Test Battery (CANTAB). The CANTAB has been administered to several patient populations and tests from the battery have been shown to be sensitive to damage in both temporal and prefrontal areas (Owen et al., 1996). Results from the test battery showed that both the Paired Associate Learning and Spatial Recognition tests were the most sensitive to normal ageing even when CCF is accounted for. In contrast, this performance on the “executive” tests, shown to be sensitive to frontal lobe damage, was not related to age, and CCF scores predicted performance on these tests. These results are discussed in relation to theories of cognitive ageing and patterns of change and in relation to several important methodological and theoretical considerations for the study of executive function. Received: 31 March 1999 / Accepted: 23 July 1999     

Mixing incompatibly mapped location-relevant trials with location-irrelevant trials: effects of stimulus mode on the reverse Simon effect

When location-relevant trials with an incompatible spatial stimulus-response mapping are mixed with location-irrelevant trials, responses on the latter trials are faster when stimulus and response locations do not correspond than when they do. Experiments 1 and 2 showed that this reverse “Simon effect” also occurs when the location information is presented verbally or symbolically on both location-relevant and location-irrelevant trials. The reversal was absent, however, in conditions of Experiments 1–3 in which the mode of presentation was different on the location-relevant trials than on the location-irrelevant trials. Experiment 4 demonstrated that differences in physical characteristics between the location-relevant and location-irrelevant stimuli were not sufficient to eliminate the reverse Simon effect. These findings imply that the short-term associations between stimulus location information and responses defined for the location-relevant task are relatively mode specific. Received: 21 December 1999 / Accepted: 26 April 2000     

Rethinking technology, revitalizing ethics: Overcoming barriers to ethical design

This paper explores the role of ethics in design. Traditionally, ethical questions have been seen as marginal issues in the design of technology. Part of the reason for this stems from the widely held notion of technology being “out of control.” This notion is a barrier to what I call “ethical design” because it implies that ethics has no role to play in the development of technology. This view, however, is challenged by recent work in the field of Science and Technology Studies (STS). Looking into the dynamics of technological change, STS scholars argue that human choices are present at every stage of a technology’s development and, furthermore, that human values are reflected in the very design of artifacts. This alternative view suggests that ethics can and should be included in the design process. Drawing on examples from the privacy arena. I point to some of the potential advantages of addressing ethical concerns early on in the design of a technology. I conclude with some general strategies for bringing ethics back into design. A version of this paper was presented at ETHICOMP98, the Fourth International Conference on Ethical Issues of Information Technology, March 25–27, 1998, Erasmus University, the Netherlands. Patrick Feng is a Ph.D. student in the Science and Technology Studies Department at Rensselaer. His research focuses on the development of technical standards that are designed to address social values such as privacy and trust.