The influence of breed and environmental factors on social and solitary play in dogs (<Emphasis Type="Italic">Canis lupus familiaris</Emphasis>)

The domestic dog is an ideal model species in which to study the genetic and environmental factors that influence play behavior. Dogs exist in a wide variety of breeds and frequently engage in multiple forms of play. In the present study, we investigated whether the levels of solitary and social play differed between dogs of three breed types with distinct predatory motor pattern sequences (herding dogs, retrievers, and livestock guarding dogs [LGDs]). Furthermore, we investigated how environmental factors (social and nonsocial contexts) influenced play in dogs of these breed types. Groups of breed-matched dyads with working experience and of equivalent age, sex, and neuter status ratios were exposed to four experimental test conditions and two control conditions in randomized orders. With respect to solitary play, environmental context did have a significant effect, with toys reliably producing the highest levels of solitary play across all breed types. Retrievers engaged in significantly higher levels of solitary play overall than LGDs, and there was a trend in comparison to herding dogs. In contrast, neither environmental context nor breed had a significant effect on social play levels; however, neuter status of the dyads did have a significant effect on social play, with mixed-status dyads engaging in significantly higher levels of social play than same-status dyads. Our findings provide experimental evidence for identifying proximate, environmental stimuli that reliably facilitate social and solitary play and discuss possible genetic (i.e., breed type) and lifetime influences on the form of play in domestic dogs.     

Environmental action and student environmental leaders: exploring the influence of environmental attitudes,locus of control,and sense of personal responsibility

The Student Climate and Conservation Congress (SC3) is a joint educational effort between the United States Fish and Wildlife Service and the Green Schools Alliance that aims to develop the next generation of conservation leaders through fostering action competence in youth. Data from SC3 participants was used to investigate four predictors of adult environmental behavior (environmental attitudes, locus of control, sense of personal responsibility, intention) to explore their predictability of environmental action and intention toward future involvement in environmental action in student environmental leaders. Of the four variables explored, pre-program levels of environmental attitudes was a significant predictor of environmental action. Additionally, changes in levels of environmental attitudes significantly predicted environmental action, with an increase in environmental attitudes being associated with a decrease in environmental action. Pre-program levels of environmental attitudes and sense of personal responsibility, and an interaction between the two, potentially were predictors of intention toward future involvement in environmental action. Changes in pre- and post-program levels of environmental attitudes, locus of control, and sense of personal responsibility did not significantly predict intention toward future involvement in environmental action, nor did environmental action. Implications for programming and research, in light of the study’s limitations, are discussed.     

Predicting policy: exploring news attention to policy issues in electoral debates

Despite news fragmentation, declining levels of voter knowledge, and waning interest in U.S. politics, debates attract mass audiences, reduce barriers of learning, and offer a greater focus on policy issues than that typically found in campaign news coverage. Nonetheless, debates are routinely driven by the same commercial, for-profit news journalists who routinely emphasize strategic campaign issues (e.g. the horserace) at the expense of policy content. As moderators, journalists have been scrutinized for the agenda they set in electoral debates. Using a multiyear dataset that treats debate questions as the unit of analysis, this quantitative content analysis explores news routines in the context of mediated debates while isolating media characteristics predictive of news attention to policy matters. The data show that journalists working for local news outlets and those working for commercial outlets are more likely to emphasize policy issues. Implications for debate sponsorship and campaigns are discussed.     

The Usability of the Websites of Alabama’s Community Colleges

This study explores the usability of community college websites. The value of a college’s website has been well established, as have accepted standards for basic website design. However, current usability standards are less clear and in various stages of acceptance. To consider this question, standards of usability were applied to all community college websites in Alabama. Websites were assessed for usability by use of a modified instrument that includes sample usability task scenarios provided by Cornell University’s Web Accessibility Toolkit and includes items from a similar exploration conducted on a national sample of colleges and universities (Meyer, 2008). The existence of specific website content tailored to prospective part-time students and the use of social media by the Alabama community colleges was also examined. Results show that most colleges meet minimum standards for usability.     

Hip adductor muscle function in forward skating

Adductor strain injuries are prevalent in ice hockey. It has long been speculated that adductor muscular strains may be caused by repeated eccentric contractions which decelerate the leg during a stride. The purpose of this study was to investigate the relationship of skating speed with muscle activity and lower limb kinematics, with a particular focus on the role of the hip adductors. Seven collegiate ice hockey players consented to participate. Surface electromyography (EMG) and kinematics of the lower extremities were measured at three skating velocities 3.33 m/s (slow), 5.00 m/s (medium) and 6.66 m/s (fast). The adductor magnus muscle exhibited disproportionately larger increases in peak muscle activation and significantly prolonged activation with increased speed. Stride rate and stride length also increased significantly with skating velocity, in contrast, hip, knee and ankle total ranges of motion did not. To accommodate for the increased stride rate with higher skating speeds, the rate of hip abduction increased significantly in concert with activations of adductor magnus indicating a substantial eccentric contraction. In conclusion, these findings highlight the functional importance of the adductor muscle group and hip abduction–adduction in skating performance as well as indirectly support the notion that groin strain injury potential increases with skating speed.     

Effect of odor preexposure on acquisition of an odor discrimination in dogs

In two experiments, we investigated the impact of odor preexposure treatments on the acquisition of an olfactory discrimination in dogs. In the first experiment, four groups of dogs were each given five days’ odor-exposure treatment prior to discrimination training. Dogs in the exposure group were exposed to anise extract (S+) for 30 min daily. Dogs in the Pavlovian-relevant pairing group received six daily delayed-conditioning trials to the same S+. The Pavlovian-irrelevant pairing group received conditioning trials to almond extract (S'). Dogs in the control group received no pretreatment. All of the dogs were then trained to detect S+ from a background pine odor (an AX-vs.-X discrimination). The Pavlovian-relevant pairing group acquired the odor discrimination significantly faster than all of the other exposure and control groups, and the remaining groups acquired the discrimination at the same rate as the no-exposure control group. In a second experiment, we extended these results to a within-subjects design using an AX-versus-BX discrimination. Six dogs were simultaneously trained on two different odor discriminations, one discrimination in which the S+ was previously Pavlovian conditioned, and one discrimination in which the S+ was novel. All of the dogs learned the odor discrimination with the previously conditioned S+ faster than they learned the novel odor discrimination, replicating the results of Experiment 1, and demonstrating that familiarity in the form of Pavlovian conditioning enhances odor-discrimination training. The potential mechanisms of the facilitated transfer of a Pavlovian conditioned stimulus to discrimination training are discussed.