Search results for "AVOIDANCE"
showing 10 items of 297 documents
Developmental trajectories of experiential avoidance and depressive symptoms and association to health behaviors among adolescents during brief guide…
2021
Abstract While many children and adolescents experience psychological problems with up to 20 percent estimated to develop a mental health problem, only few receive treatment. Online interventions can help respond to the need of support among young people without requiring considerable resources. However, relatively few studies have examined the efficacy of online interventions for youth and more research is needed to understand individual differences in benefiting from these interventions. The current study sought to examine different developmental trajectories of experiential avoidance and depressive symptoms and their association to health behaviors measured at baseline during a brief gui…
Spontaneous quantity discrimination of artificial flowers by foraging honeybees
2020
ABSTRACTMany animals need to process numerical and quantity information in order to survive. Spontaneous quantity discrimination allows differentiation between two or more quantities without reinforcement or prior training on any numerical task. It is useful for assessing food resources, aggressive interactions, predator avoidance and prey choice. Honeybees have previously demonstrated landmark counting, quantity matching, use of numerical rules, quantity discrimination and arithmetic, but have not been tested for spontaneous quantity discrimination. In bees, spontaneous quantity discrimination could be useful when assessing the quantity of flowers available in a patch and thus maximizing f…
Can aposematic signals evolve by gradual change?
1999
Aposematic species, which signal conspicuously of their unprofitability to predators, have puzzled evolutionary biologists for over a century1,2. Although conspicuousness of unpalatable prey improves avoidance learning by predators3,4,5, it also involves an evolutionary paradox: with increasing detectability4,6,7,8 the deviant aposematic prey would suffer high predation initially from naive predators. Here we test a neglected idea7,8,9,10,11 that aposematic coloration may evolve by gradual change rather than by major mutations. Weak signals did not suffer high initial predation, but predators (great tits, Parus major) did not learn to separate them from cryptic palatable prey. Furthermore, …
A novel clustering-based algorithm for solving spatially-constrained robotic task sequencing problems
2021
The robotic task sequencing problem (RTSP) appears in various forms across many industrial applications and consists of developing an optimal sequence of motions to visit a set of target points defined in a task space. Developing solutions to problems involving complex spatial constraints remains challenging due to the existence of multiple inverse kinematic solutions and the requirements for collision avoidance. So far existing studies have been limited to relaxed RTSPs involving a small number of target points and relatively uncluttered environments. When extending existing methods to problems involving greater spatial constraints and large sets of target points, they either require subst…
Can ultraviolet cues function as aposematic signals?
2001
The fact that birds are sensitive to ultraviolet light (UV, 320–400 nm) has been largely ignored by previous studies of aposematism. Therefore, in the present article we investigated whether great tits preferred ultraviolet-reflecting colors compared to colors without UV reflection and whether UV cues alone could function as aposematic signals. We were able to manipulate prey visibility in UV light by changing the UV reflectance of prey items as well as altering the lighting conditions. In order to perform a preference experiment we used three pairs of colors (green UV vs. green, gray UV vs. gray, yellow UV vs. yellow) on a black background. The birds ate both UV types equally for all three…
The importance of pattern similarity between Müllerian mimics in predator avoidance learning
2004
Müllerian mimicry, where unpalatable prey share common warning patterns, has long fascinated evolutionary biologists. It is commonly assumed that Müllerian mimics benefit by sharing the costs of predator education, thus reducing per capita mortality, although there has been no direct test of this assumption. Here, we specifically measure the selection pressure exerted by avian predators on unpalatable prey with different degrees of visual similarity in their warning patterns. Using wild-caught birds foraging on novel patterned prey in the laboratory, we unexpectedly found that pattern similarity did not increase the speed of avoidance learning, and even dissimilar mimics shared the educatio…
Experience and dominance in fish pairs jointly shape parasite avoidance behaviour
2018
There is increasing evidence that the composition of a social group influences the fitness of its members. For example, group member identities can determine the exposure risk to contact-transmitted parasites and consequently impact the health of all group members. Here, we propose that group composition may also affect host exposure to parasite propagules prevailing in the environment via collective parasite avoidance behaviours. We explored the spatial avoidance of a trematode parasite, Diplostomum pseudospathaceum, using the simplest form of host groups, pairs of sea trout, Salmo trutta trutta. These pairs showed either (1) between-group heterogeneity in their experience with the parasit…
Corporate tax cuts and business-friendly policies in the UK - A review of electoral arguments during the 2015 legislative campaign
2016
The stance toward big business was a heated topic during Britain’s 2015 legislative campaign that led to the triumphal, albeit slightly unexpected, reelection of David Cameron, as Prime Minister. More profoundly, it raises the issue of the economic impact of corporate tax cuts and the nature of business-friendly policies in the UK. Firstly, we investigate the electoral arguments on both sides of the political spectrum. These discussions are framed within the overarching approach known as supply-side economics, which has been prevalent in English-speaking countries since the neoliberal revolution in the late 1970s. Secondly, we put forward the idea that widening inequalities, as suggested re…
Performance Evaluation of CANIT Algorithm in Presence of Congestion Losses
2001
In this paper, we analize by queuing-simulation CANIT (Congestion Avoidance with Normalized Interval of Time) algorithm performances in presence of congestion losses. In a former work [3], we proposed the algorithm (CANIT) for TCP (Transmission Control Protocol) congestion avoidance phase in order to improve fairness during this phase, and we showed that using CANIT algorithm in an environment without loss, instead of standard congestion avoidance algorithm improves both congestion avoidance fairness and bandwith utilization for long RTT connections. In this paper, we consider congestion losses and show that the fairness as well as the bandwith utilization are more efficient when using CANI…
Incompleteness and not just right experiences in the explanation of Obsessive-Compulsive Disorder.
2015
In the past decade, not just right experiences (NJRE) and incompleteness (INC) have attracted renewed interest as putative motivators of symptoms in obsessive-compulsive disorder (OCD), beyond harm avoidance (HA). This study examines, in 267 non-clinical undergraduates and 47 OCD patients, the differential contributions of HA, INC, and NJRE to the different OCD symptom dimensions and the propensity to have the disorder. The results indicate that although both the NJRE and INC range from normality to OCD, their number and intensity significantly increase as the obsessional tendencies increase, which suggests that they are vulnerability markers for OCD. Although they cannot be considered full…