Feature-positive discriminations during a spatial-search task with humans

During feature-positive operant discriminations, a conditional cue, X, signals whether responses made during a second stimulus, A, are reinforced. Few studies have examined how landmarks, which can be trained to control the spatial distribution of responses during search tasks, might operate under conditional control. We trained college students to search for a target hidden on a computer monitor. Participants learned that responses to a hidden target location signaled by a landmark (e.g., A) would be reinforced only if the landmark was preceded by a colored background display (e.g., X). In Experiment 1, participants received feature-positive training (+←YB/ XA→+/A?/B?) with the hidden target to the right of A and to left of B. Responding during nonreinforced transfer test trials (XB?/YA?) indicated conditional control by the colored background, and spatial accuracy indicated a greater weighting of spatial information provided by the landmark than by the conditional cue. In Experiments 2a and 2b, the location of the target relative to landmark A was conditional on the colored background (+←YA/ XA→+/ ZB→+/ +←C /A?/B?). At test, conditional control and a greater weighting for the landmark’s spatial information were again found, but we also report evidence for spatial interference by the conditional stimulus. Overall, we found that hierarchical accounts best explain the observed differences in response magnitude, whereas spatial accuracy was best explained via spatial learning models that emphasize the reliability, stability, and proximity of landmarks to a target.     

The humanist moment

In “The Humanist Moment,” Chris Higgins sets out to recover a tenable, living humanism, rejecting both the version vilified by the anti-humanists and the one sentimentalized by the reactionary nostalgists. Rescuing humanism from such polemics is only the first step, as we find at least nine rival, contemporary definitions of humanism. Which movement or theory is the real humanism? Higgins contends that we can reconstruct a critical, dialectical humanism from the very tensions in these conceptions. On this view, humanism is neither a theory nor a movement, but a moment, a specific intervention evincing characteristic sensibilities, enabling us to navigate through one of a number of recurring dead spots in the life of culture. Higgins outlines four ongoing human dialectics whose vibrant center the humanist helps us regain: genuine hope/acceptance in the face of both fantasy and cynicism; combined awareness of our connectedness and distinctiveness rejecting both dogmatic universalizing and particularizing discourses; and humane learning as distant from scholasticism as it is from anti-intellectualism. An entire section is devoted to the fourth dialectic, showing how humanism has appeared as a corrective both to historicism and to presentism, helping us reconnect with the untimely, living voice of tradition.     

Caffeine use in a Super Rugby game and its relationship to post-game sleep

Objective: To examine the relationship between regular game-related caffeine consumption on sleep after an evening Super Rugby game. Methods: Twenty elite rugby union players wore a wrist-activity monitor to measure sleep for three days before, three days after and on the night of an evening Super Rugby game (19:00–21:00). Players ingested caffeine as they would normally (i.e. before and sometimes during a game) and saliva samples were collected before (17:00) and after (21:30) the game for caffeine concentration. Results: Compared to the nights leading up to the game, on the night of the game, players went to bed 3?h later (23:08?±?66?min vs 02:11?±?114?min; p?p?p?p?p?p?=?.06) on game night. Conclusion: Caffeine consumption before a Super Rugby game markedly increases post-game saliva caffeine levels. This may contribute to the observed 3.5?h delay in time at sleep onset and the 1.5?h reduction in sleep duration on the night of the game. This study highlights the need for a strategic approach to the use of caffeine within a Super Rugby team considering the potential effect on post-game sleep.     

How Expert Designers Design

Two studies were carried out with expert educational designers at Arthur Andersen and the Open University of the Netherlands to determine the priorities they employed when designing competence‐based learning environments. Designers in a university context and in a business context agree almost completely on what principles are important, the most important being that one should start a design enterprise from the needs of the learners, instead of the content structure of the learning do main. The main difference between the two groups is that university designers find it extremely important to consider alternative solutions during the whole design process; something that is considerably less important by business designers. University designers also tend to focus on the project plan and the desired characteristics of the instructional blueprint whereas business designers were much more client‐oriented and stressed the importance of “buying in” the client early in the process.