A kinetic equation for economic value estimation with irrationality and herding

A kinetic inhomogeneous Boltzmann-type equation is proposed to model the dynamics of the number of agents in a large market depending on the estimated value of an asset and the rationality of the agents. The interaction rules take into account the interplay of the agents with sources of public information, herding phenomena, and irrationality of the individuals. In the formal grazing collision limit, a nonlinear nonlocal Fokker-Planck equation with anisotropic (or incomplete) diffusion is derived. The existence of global-in-time weak solutions to the Fokker-Planck initial-boundary-value problem is proved. Numerical experiments for the Boltzmann equation highlight the importance of the reliability of public information in the formation of bubbles and crashes. The use of Bollinger bands in the simulations shows how herding may lead to strong trends with low volatility of the asset prices, but eventually also to abrupt corrections

Proceedings of the Thirteenth International Society of Sports Nutrition (ISSN) Conference and Expo

Meeting Abstracts: Proceedings of the Thirteenth International Society of Sports Nutrition (ISSN) Conference and Expo Clearwater Beach, FL, USA. 9-11 June 201

Visual attention and phonologicalpProcessing are both impaired in preschool children at risk of dyslexia

According to cognitive models of reading acquisition, the mastery of automatic grapheme-phoneme mappings (ie, the basis of phonological assembly) is a crucial prerequisite for the development of skilled reading. Phonological assembly--leading from a visual input to a linguistic output--requires, in addition to awareness of speech sounds, a graphemic parsing (GP) process that segments a letter string into graphemes. Indeed, both phonological segmentation and GP were found to be impaired in dyslexic children when compared to the age and reading level matched controls. A causal hypothesis suggests that the visuo-attentional mechanisms involved in GP are already compromised in preschoolers at risk of developmental dyslexia. To investigate this hypothesis, we measured the efficiency in orienting visual attention to a brief spatial exogenous cue when subjects were engaged in a task that required the identification of a target flanked by lateral noise (ie crowding condition). Our results show, for the first time, that children at risk of dyslexia (N=20) compared to controls (N=67) present a marked disorder of visuo-attentional orienting, in addition to the typical syllabic segmentation deficit. These results support the hypothesis of a causal link between a deficit of multi-sensory attention and developmental dyslexia

Atrial fibrillation recurrences after eletrical transthoracic cardioversion performed in day-hospital.

ABSTRAC

Cardioversione elettrica transtoracica della fibrillazione atriale eseguita in Day-Hospital: efficacia a medio termine.

ABSTRAC