Effects of acute administration of nicotine and lobeline on agonistic encounters in male mice

The effects of acute administration of two nicotinic ligands, (‐)‐nicotine and (‐)‐lobeline were examined on isolation‐induced aggression in mice. Individually housed male mice confronted anosmic “standard opponents” in a neutral arena 10 min after drug administration. Encounters were videotaped and evaluated using an ethologically based analysis facilitating estimation of time allocated to 11 broad behavioral categories. Nicotine did not have significant effects on threat or attack but significantly diminished time allocated to digging. The lowest dose of lobeline significantly diminished attack and induced a slight increase of immobility without significantly diminishing other behaviors with motor components. The intermediate and highest dose of lobeline reduced time allocated to all behaviors with motor components. It is concluded that these two nicotinic agonists produce different behavioral profiles during agonistic encounters in mice but that this test may not facilitate assessing the impact of such drugs on irritability. Aggr. Behav. 26:376–385, 2000. © 2000 Wiley‐Liss, Inc.     

Dominance and aggression in various sized groups of red deer stags

The influence of group size on agonistic behaviour of “white” red deer stags (Cervus elophus L.) of different ranks in the hierarchy was examined during artificial feeding. Size of the social group was dependent on the season in the year and on age and general rank within the whole bachelor group inhabiting the enclosure of the stags. Group size differentially affected the behaviour of the stags according to the rank of the individual in the particular groups. Increased group size resulted in increased agonistic activity in top-ranking stags. The number of attacks directed towards bottom-ranking stags by other group members was also elevated. Stags of intermediate rank position showed a decrease in the number of interactions involved and a suppression of agonistic activity.     

Cultural influences on face scanning are consistent across infancy and adulthood

The emergence of cultural differences in face scanning is thought to be shaped by social experience. However, previous studies mainly investigated eye movements of adults and little is known about early development. The current study recorded eye movements of British and Japanese infants (aged 10 and 16 months) and adults, who were presented with static and dynamic faces on screen. Cultural differences were observed across all age groups, with British participants exhibiting more mouth scanning, and Japanese individuals showing increased central face (nose) scanning for dynamic stimuli. Age-related influences independent of culture were also revealed, with a shift from eye to mouth scanning between 10 and 16 months, while adults distributed their gaze more flexibly. Against our prediction, no age-related increases in cultural differences were observed, suggesting the possibility that cultural differences are largely manifest by 10 months of age. Overall, the findings suggest that individuals adopt visual strategies in line with their cultural background from early in infancy, pointing to the development of a highly adaptive face processing system that is shaped by early sociocultural experience.     

Evaluating the influence of time of day on activity engagement in persons with dementia

Dementia is a serious disease affecting a growing number of people. With the onset of dementia comes a decline in social activity engagement that can negatively impact multiple aspects of a person's life. Research suggests that time of day may influence a person with dementia's behavior, including activity engagement, but such research is limited. The purpose of this study was to evaluate the influence of time of day on engagement in activities in persons diagnosed with dementia. An alternating treatments design was used with three participants to measure activity engagement during two times of day, morning and afternoon, and during two activities, a moderately preferred and a low preferred. Results showed no differentiation in engagement between morning and afternoon activities for all three participants, with high levels of engagement during both times of day. For two participants, results showed no differentiation in engagement between moderately preferred and low preferred activities. For one participant, levels of engagement were higher during moderately preferred activities than during low preferred activities.     

The effect of leftward bias on visual attention for driving tasks

The leftward bias of driving visual attention has been found to explain the role of driving experience in the visual attention strategy; even though the results reported in the literature are not always consistent. This study aims to explore the driving attention characteristics and the eye movement patterns by using a simulated driving experiment in conjunction with an eye-tracker device. 31 young inexperienced drivers (undergraduate students, average age 21) and 30 old experienced drivers (taxi drivers, average age 36) took part in the experiment. Results show that the eye movement patterns of the drivers have certain similarity in the occurrence of subtle asymmetries of visual attention favouring left space (the direction of the driving in the experiment was right-side) and that they are related to the right hemisphere specialization for spatial attention. However, in the more experienced drivers the leftward eye movement tends to shift toward the centre or even rightward to pay attention to the hazard events on road. These results suggest that inexperienced drivers are initially aroused by natural biological leftward visual attention and likely to develop central and rightward eye movement strategy for safety diving purpose. The implications of this study suggest that, despite the existence of natural visual attention bias, the left asymmetries in visual scan in inexperienced drivers still can be modified by driving trainings that focus on the hazard situation on road.     

The interactive effect of vehicle signals and sensation-seeking on driver hazard perception

Does sensation seeking—as a personality trait that is closely related to risky driving—affect a driver's hazard perception, and if so, under what circumstances? Using hazard locations and vehicle signals as cues, this study classifies traffic situations into four types: danger ahead with cues, danger ahead without cues, danger behind with cues, and danger behind without cues. Based on these classifications, we examine the characteristics of hazard perception, decision-making criteria, sensitivity, and visual attention patterns of drivers with different sensation-seeking tendencies. Fifty-two experienced drivers were recruited for experiments in Dalian, China. Using computer, participants were shown videos taken from the driver's perspective and were asked to respond to hazards by pressing keys on the left mouse button. Their eye movements were recorded, and a multi-dimensional driving-style scale was used to divide participants into higher and lower sensation-seeking groups. The results showed that the higher sensation-seeking drivers had a lower hazard detection rate, fewer fixation counts, and shorter glances when there were cues, and they responded more slowly when there was danger ahead. For dangers ahead with cues and dangers behind without cues, the more attention the higher sensation-seeking drivers paid to the danger, the slower their response and the lower their hazard detection rate. The results indicated that higher sensation-seeking drivers have poor hazard perception in situations when there are vehicle signals as prompting clues and dangers ahead. In particular, for a danger with clues, the visual agility of the higher sensation-seeking drivers was worse than that of the lower sensation-seeking drivers. The more attention they paid to the danger the worse their hazard perception. The results of this study can provide guidance to teach drivers hazard-perception skills.     

A two-fold transformation model for human action recognition using decisive pose

Human action recognition in videos is a tough task due to the complex background, geometrical transformation and an enormous volume of data. Hence, to address these issues, an effective algorithm is developed, which can identify human action in videos using a single decisive pose. To achieve the task, a decisive pose is extracted using optical flow, and further, feature extraction is done via a two-fold transformation of wavelet. The two-fold transformation is done via Gabor Wavelet Transform (GWT) and Ridgelet Transform (RT). The GWT produces a feature vector by calculating first-order statistics values of different scale and orientations of an input pose, which have robustness against translation, scaling and rotation. The orientation-dependent shape characteristics of human action are computed using RT. The fusion of these features gives a robust unified algorithm. The effectiveness of the algorithm is measured on four publicly datasets i.e. KTH, Weizmann, Ballet Movement, and UT Interaction and accuracy reported on these datasets are 96.66%, 96%, 92.75% and 100%, respectively. The comparison of accuracies with similar state-of-the-arts shows superior performance.     

Implicit and explicit evaluations of a mass media physical activity campaign: Does everything get better?

The purpose of this research was to evaluate a population level mass media campaign using implicit (i.e., automatic) and explicit (i.e., non-automatic) measures of evaluations and to determine if discrepant or summed evaluations were associated with endorsing campaign objectives: that physical activity can improve relationship-related, mind-related, or body-related outcomes. Participants (N = 1600) completed an online survey which included a single-category implicit association task that measured more automatic or implicit evaluative responses of images from the campaign. The survey also included questions assessing prompted awareness of the campaign, explicitly measured evaluations of the advertisements, and evaluations of whether participating in physical activity makes one’s relationships, mind, or body better. Results showed participants who rated the advertisements as more appealing exhibited more positive implicit evaluations of the campaign. Evaluating the ads as offensive was negatively related to explicit evaluations of whether physical activity makes relationships, mind, or body better; past behaviour and sum and discrepancy scores were positively related to endorsing relationship, mind, and body outcomes. By including implicit evaluation of a playful and creative campaign designed to influence perceptions of what physical activity can make better, this research highlighted that campaign creators should carefully consider what to include. Discrepant evaluations may indicate benefits that could be highlighted because evaluation of them is more amenable to change. Based on current findings, one possible focus of such campaigns may be the relationship-related benefits of PA.     

Physical activity and posttraumatic growth: A systematic review of quantitative and qualitative studies

ObjectivesThis systematic review aimed to examine the relationships between physical activity and posttraumatic growth (PTG) following a highly stressful life event.DesignA systematic review was conducted to identify eligible articles. A meta-analysis was conducted for quantitative studies and a meta-ethnographic synthesis was conducted for qualitative studies.MethodAfter systematic searches of five databases and literature screening, 20 quantitative studies and 12 qualitative studies were included in the final review. A meta-analysis of 14 quantitative studies was conducted to examine association between leisure-time physical activity and PTG. A meta-ethnographic synthesis of 10 qualitative studies was conducted to examine the relationship between physical activity and the experience of PTG.ResultsThe meta-analysis revealed a positive, yet small, association between leisure-time physical activity and PTG (average correlation = 0.120; 95% confidence interval: 0.071 to 0.168; p < 0.001). The effect sizes did not differ by measurements of PTG and participants’ age and gender but were smaller in studies with a binary variable of physical activity, a sample of participants with moderate or advanced diseases, and a longer period since the stressful event. The meta-ethnographic synthesis identified potential processes linking physical activity and PTG, including perceptions of self, social experiences, philosophical re-evaluation, and health effects.ConclusionsThis review suggest physical activity is a behavioral factor that may facilitate PTG. It highlights methodological considerations for further research.