Violence in sports and among sportsmen: a single or two‐track issue?

The object of this study is to find our whether there are differences between the forms of violence exerted by sportsmen and those represented within sports areas. Three hundred competitors from five sports disciplines (karate, basketball, table tennis, swimming and shooting) were approached and filled out a questionnaire. Results showed (1) sportsmen do not exert the same forms of violence depending on the sport and that there are similarities between the forms of violence in sports and those represented in the sporting field which supports the “homological assumption” [Bourdieu, 1979 ]; (2) the frequency and degree of the forms of violence relate to one another and differentiate sports significantly, thus confirming the influence of their level; and (3) a cross‐matching of the forms of violence and their level shows an uneven distribution of the sports in three “classes”. Therefore, these overall results show that the forms of violence, their frequency and their degree are particularly effective variables when accounting for differences in “relations” violence in sports and among sportsmen. Aggr. Behav. 32:1–10, 2006. © 2006 Wiley‐Liss, Inc.     

Blocking by fixed and variable stimuli: Effects of stimulus distribution on blocking

An experiment with rats compared the ability of fixed and variable duration cues to produce blocking. Rats in group B (Blocking) were trained that both fixed- (F) and variable- (V) duration cues would be followed by food delivery. In a subsequent training stage F and V continued to be reinforced, but F was accompanied by X, and V by Y. In the test phase responding to X and Y was examined. Control group O (Overshadowing) received identical treatment, except that F and V were nonreinforced in the first training stage. In group B there was evidence for blocking, but only of X, which had been conditioned in compound with the fixed-duration F; there was no evidence for blocking of Y, which had been conditioned in compound with the variable-duration V. It is suggested that this result may occur because fixed cues reach a higher, more stable asymptote of associative strength than do their variable equivalents.     

Testing for selectivity in the dependence of random variables on external factors

Random variables A and B, whose joint distribution depends on factors (x,y), are selectively influenced by x and y, respectively, if A and B can be represented as functions of, respectively, (x,S_A,C) and (y,S_B,C), where S_A,S_B,C are stochastically independent and do not depend on (x,y). Selective influence implies selective dependence of marginal distributions on the respective factors: thus no parameter of A may depend on y. But parameters characterizing stochastic interdependence of A and B, such as their mixed moments, are generally functions of both x and y. We derive two simple necessary conditions for selective dependence of (A,B) on (x,y), which can be used to conduct a potential infinity of selectiveness tests. One condition is that, for any factor values x,x^′ and y,y^′,

s_xy≤s_xy^′+s_x^′y^′+s_x^′y,     

中国古代心理学思想中的注意问题

本文根据古代思想家的有关言论,探讨了他们的注意心理思想,即注意的慨念。特征,分心与分散,分配与集中,注意与感知、记忆、思维的关系,注意在学习中的作用。