信任及其对公共财物两难博弈中合作行为影响

社会两难的行为动机研究认为,害怕和贪婪是人们选择不合作的原因。信任的心理学研究为社会两难的合作行为提供了另一种观点,即害怕被利用的背后实际上体现了博弈者对对方的信任的缺失。鉴于传统社会两难范式存在难以区分信任和合作两个因素的问题,本研究设计了“信任一合作”二阶段模拟实验,通过操作重复信托博弈中的信息反馈,研究虚拟多人信托博弈中初始信任和基于经验的信任对随后的公共财物两难博弈中合作行为的影响,结果发现：（1）初始信任对基于经验的信任的建立具有一定的积极影响,但是它对合作行为的作用远不如随后的基于经验的信任;（2）基于经验的信任水平高的被试在随后的公共财物两难博弈中也表现出较高的合作行为。     

Initial excitatory conditioning with the truly random control procedure in rats: The effects of density of the conditioned stimulus

The present experiments were designed to test whether initial excitatory conditioning to a stimulus was obtained, using a within-subject design of the truly random control (TRC) procedure, and to examine the effects of the density of the conditioned stimulus on it. In Experiment 1, the effect of the three levels of CS density (50%, 25%, 20%) was assessed at six different stages of training, using the conditioned suppression of licking in rats. Although all of the groups given the TRC procedure showed evidence of initial excitatory conditioning, it was more marked in the group with the highest CS density than in the other groups. Experiment 2 confirmed the results of Experiment 1, using a between-subject design. The findings are in line with predictions from the Rescorla-Wagner model, and are discussed with reference to other contemporary theories of associative learning.     

Determinants of pausing under variable-ratio schedules: Reinforcer magnitude, ratio size, and schedule configuration

Pigeons pecked a key under two-component multiple variable-ratio schedules that offered 8-s or 2-s access to grain. Phase 1 assessed the effects of differences in reinforcer magnitude on postreinforcement pausing, as a function of ratio size. In Phase 2, postreinforcement pausing and the first five interresponse times in each ratio were measured as a function of differences in reinforcer magnitude under equal variable-ratio schedules consisting of different configurations of individual ratios. Rates were also calculated exclusive of postreinforcement pause times in both phases. The results from Phase 1 showed that as ratio size increased, the differences in pausing educed by unequal reinforcer magnitudes also increased. The results of Phase 2 showed that the effects of reinforcer magnitude on pausing and IRT durations were a function of schedule configuration. Under one configuration, in which the smallest ratio was a fixed-ratio 1, pauses were unaffected by magnitude but the first five interresponse times were affected. Under the other configuration, in which the smallest ratio was a fixed-ratio 7, pauses were affected by reinforcer magnitude but the first five interresponse times were not. The effect of each configuration seemed to be determined by the value of the smallest individual ratio. Rates calculated exclusive of postreinforcement pause times were, in general, directly related to reinforcer magnitude, and the relation was shown to be a function of schedule configuration.     

Spirituality and education for global citizenship: developing student teachers’ perceptions and practice

Education for Global Citizenship (E4GC) offers many opportunities to explore spirituality and a sense of how one fits into the world at a range of levels. Beyond the Curriculum Boundaries is a project that enables student teachers to consider E4GC alongside issues of multiculturalism, antiracism and democracy education, with a strong focus on religious education and geography. This paper outlines the ethos behind the project, identifies key elements and themes, appraises student responses, and evaluates key learning points. Student teachers respond to the module in a variety of ways that inform their learning and teaching, and development takes place on both personal and professional levels: as the project has developed the awareness of children’s worldviews and the sense of interconnectedness with others has grown, adding an increasingly spiritual dimension to learning. This article argues that E4GC provides an effective vehicle for supporting the often‐overlooked spiritual dimension of children development.     

Deterministisches Chaos: Einige Wissenschaftstheoretisch Interessante Aspekte

Deterministic Chaos: Some Interesting Points of View from the Philosophy of Science. A comparatively simple example is used to present some of the main features of deterministic chaos. From the point of view of the philosophy of science, three questions are dealt with: if the equations of motion of chaotic systems are falsifiable in a strict sense; whether experiments on chaotic systems are reproducible; to what extent the development of chaotic systems is predictable. It emerges that in these respects chaotic systems, though being deterministic, behave essentially in the same way as stochastic (indeterministic) systems do.     

Conjunctive schedules of reinforcement: III. A fixed-interval adjusting fixed-ratio schedule

Key pecking of three pigeons was studied under a conjunctive schedule that specified both a fixed-interval and an adjusting fixed-ratio requirement. The fixed-interval schedule was 6 min for one pigeon and 3 min for the other two. The size of the ratio requirement was determined within each cycle of the fixed interval by the duration of the pause before responding began. The fixed-ratio value was at maximum at the start of each fixed interval and decreased linearly until the first response occurred (adjusting fixed-ratio schedule). A peck produced food when the number of responses remaining on the fixed-ratio schedule was completed and when the fixed interval had elapsed. If no response occurred during the interval, the fixed-ratio requirement decreased to one and a single response after the interval elapsed produced food. The initial value of the adjusting fixed-ratio schedule was studied over a range of 0 to 900. Increases in the adjusting fixed-ratio schedule to about 300 responses increased both pause duration and running response rate and also modified the pattern of responding from that obtained under the fixed-interval schedule. Higher values of the adjusting fixed ratio generally decreased pause duration and running response rate and also disrupted responding. Interreinforcement time under the conjunctive schedule was increased substantially when the adjusting fixed-ratio size exceeded 300 responses.     

The assumed effects of positive feedback paired with success on motivation to do a task: The cases of characters with high and low initial levels of interest

This study investigated the effects of positive feedback paired with success on motivation to do a task, and examined whether this differed according to whether the person performing the task had a high or low initial level of interest in that task. Subjects (448 junior college students) were asked to rate (from 0–10) the level of motivation of characters in four different stories. Subjects believed that positive feedback would encourage the character to do a task regardless of initial level of interest. However, when positive feedback could not be expected, ratings for motivation fell. Ratings for motivation were further analyzed when no positive feedback could be expected, either after an earlier experience of positive feedback paired with success or after success only (no feedback). In the case of a low initial level of interest, it was assumed that motivation would be increased after positive feedback, but in the case of a high initial level of interest motivation was assumed to be decreased by an earlier experience of positive feedback paired with success. These results suggest that the effect of positive feedback paired with success will differ according to the level of a person's initial interest.     

Determinants of a Negotiator's Initial Opening Offer

Although the initial offer is a crucial aspect in the process of most negotiations, there is still a complete lack of empirical evidence on what underpins initial offer decisions. For this reason, the effects of different reference points on the negotiator's initial offer were examined in this study. Results from a sample of 596 managers indicate that knowledge of the opponent's best available alternative, or (Best Alternative To a Negotiated Agreement BATNA), is by far the strongest determinant. Criteria of fairness, as reflected in an estimated market price, are also important. However, awareness of the dependency of the other party has no direct effect on the initial offer. Apparently, negotiators define the negotiation game as the management of interdependency in an extremely egocentric way and base their opening offers largely on cues regarding the power structure within the dyad.