Aggressive fibromatosis is a rare tumour with unpredictable growth and varying recurrence rates. It doesn't develop distant metastases but locally it shows an aggressive and infiltrative behaviour. It is never encapsulated and is rich in collagen and proliferative fibroblasts that are devoid of atypical nuclei. The degree of cellularity varies from area to area and from tumour to tumour. A rare...

Aggressive angiomyxoma is an infrequent tumour of the vulva of which only single ease and small series have been reported in the literature. The biological behaviour of this lesion is variable. In many patients, the tumour is benign, although an aggressive outcome with recurrences is common. Metastasis has not been described. We report three cases of aggressive angiomyxoma of the vulva that cli...

We investigated how male cricket frogs Acris crepitans, alter their advertisement calls in response to broadcasts of synthetic calls that were either 'attractive' or 'aggressive'. The stimulus calls differed in temporal but not spectral characteristics. Male cricket frogs produced a more aggressive call when presented with the aggressive stimulus, indicating that they perceived the temporal dif...

Animals use aggressive behaviour to gain access to resources, and individuals adjust their behaviour relative to resource value and own resource holding potential (RHP). Normally, smaller individuals have inferior fighting abilities compared with larger conspecifics. Affective and cognitive processes can alter contest dynamics, but the interaction between such effects and that of differing RHPs...

All animals interact with conspecifics during their life, and nearly all also display some form of aggression. An enduring challenge, however, is to understand how the experiences of an individual animal influence its later behaviours. Several studies have shown that prior winning experience increases the probability of initiating fights in later encounters. Using behavioural assays in the labo...

BACKGROUND Inpatient aggression in treatment facilities for persons with intellectual disability (ID) can have aversive consequences, for co-clients and staff, but also for the aggressors themselves. To manage and eventually prevent inpatient aggressive incidents, more knowledge about their types and characteristics is necessary. METHOD In four facilities, totalling 150 beds, specialized in t...

Recent reviews on the validity of rodent aggression models for human violence have addressed the dimension of pathological, maladaptive, violent forms of aggression in male rodent aggressive behaviour. Among the neurobiological mechanisms proposed for the regulation of aggressive behaviour in its normal and pathological forms, serotonin plays a major role. However, the results on the detailed m...