Training effects on dynamic visual acuity with free-head viewing.

Training effects on dynamic visual acuity (DVA) were determined over a range of target durations and target velocities under the viewing condition of free-head movement. Dynamic acuity levels were lower than static acuity levels, and training was found to be very effective in improving performance, particularly under the most difficult conditions in which performance was poorest. Improvement was also most evident among those observers who initially exhibited the poorest DVA scores. Preliminary comparisons between DVA scores of a nonselect sample of college students and those of a small group of college athletes indicated that the athletes were not very different from the nonselect group and would also benefit from training on the task.     

从劳动逻辑到实践逻辑

马克思实践哲学面临了从劳动逻辑向实践逻辑提升和转换的需要,以拯救易被化约于"劳动"之中的伦理—政治型"实践"范畴的独立地位。但这项工作必须自觉区别于西方实践哲学传统的"实践"与"劳动"二分立场。马克思劳动概念中蕴含了属于它自身的伦理规范内涵,需要将这一伦理规范内涵释放出来,以完成向伦理—政治型实践范畴的过渡。