首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 890 毫秒
1.
When choosing between two alternatives that deliver the same amount of food per trial in the long run, organisms are calledrisk-averse if they choose a small certain reinforcer over a larger probabilistic reinforcer. They are calledrisk-prone if they choose the larger probabilistic reinforcer. This experiment attempted to predict whether rats would be risk-prone or risk-averse on the basis of their separate choices between reinforcers differing in probability and reinforcers differing in amount. Choice was measured with an adjusting-delay procedure, which provided estimates of indifference points, or pairs of alternatives that a subject chose about equally often. The subjects were usually more responsive to differences in amount than to differences in probability, leading to predictions of risk-proneness for choices between two probability-amount combinations. The predictions were confirmed in almost every case. As the number of food pellets delivered by the two alternatives was increased while maintaining a 2:1 difference between them, the tendency toward risk-proneness declined. These results suggest an explanation of the inconsistent findings obtained in previous experiments on risk-taking by rats.  相似文献   

2.
A series of four experiments studied the retention of the response made on a just-preceding trial as a function of the presence, and amount, of food reward given on that trial. Rats were trained to alternate arm choices in a T-maze, and then were tested for alternation with 5- or 30-sec delays between runs. When the subjects had received prior experience with the reward amounts used in testing, larger rewards led to better retention than did small or no rewards. However, when reward omission first occurred during the test phase, it produced more alternation on the following trial than did reward presence. The results suggest that both reward amount and surprisingness determine short-term retention of responses paired with the rewards.  相似文献   

3.
This study attempts to apply the expectancy model of work motivation to the prediction of students' choice between seeking graduate-level training in their home country and traveling overseas for that purpose. The expectancy model was adjusted to accommodate the path goal instrumentalities of the two mutually exclusive choices. Prediction of choice was based on the difference between the subjective perceptions of the two alternatives. Senior undergraduate students (450) completed the study questionnaire a few weeks before graduation. The questionnaire assessed the instrumentality (I) of the two alternatives for the attainment of 11 life outcomes and the valence (V) of the outcomes. The actual choice of graduate school location was also reported by the students. As predicted, significant differences between the subjects who decided to stay in their home country and those who decided to travel were found in terms of theirI ×V only when the instrumentality of both alternatives was accounted for. Intrinsic outcomes were found to be better related to criterion than extrinsic ones. There were no differences between the groups in terms of theV component of the model. The results are discussed in terms of their implications for the structure of the decision making process regarding alternative choices for career development.  相似文献   

4.
This article uses individual data on 10,000 higher education students and 5,000 graduates in the Philippines in 1977 to assess theex ante student perceptions of the labour market against actual labour market outcomes. A comparison of mean expected and actual earnings by various sample characteristics reveals a high degree of realism from the students' viewpoint. Individual self-assessed foregone earnings are used to estimate theex ante returns to higher education and to investment in particular fields of specialization. The expected returns are close to the actual returns. Expected and actual waiting time to first job are of a short duration and a sharply declining function of age. Family background and college performance strongly influence the expected and actual labour market outcomes. The policy implications of the results are briefly discussed.  相似文献   

5.
Rats received pairings of two stimuli with reward noncontingently in the Skinner box. During noncontingent pairings, the bar was immobilized. For Group CC 100% of the presentations of both stimuli were rewarded (S1 ±, S2 ±), for Group PP 50% of the presentations of each stimulus were rewarded (S1, ±, S2±), and for Group PC one stimulus was followed by reward on 50% of its presentations, while the second stimulus was followed by reward on 100% of its presentations (S1 ±, S2 ±). A fourth group received the stimuli and reward nonpaired. In a subsequent rewarded test phase, the response facilitating effects of the stimuli were evaluated. In the test phase all groups that received reward paired with S1, and S2 performed better in the presence of S1 and S2 than the group for which the stimuli were not paired with reward. For groups that received the stimuli paired with reward, a difference due to schedule of reward occurred when schedule of reward was varied within Ss (Group PC), but not when varied between Ss (Group PP vs Group CC). The specific form of this finding was that Group PC’s performance in the presence of S2 ± was more vigorous than its performance in the presence of S1 ± and was more vigorous than the performance of Groups PP and CC to S2. Group PC’s performance to S1 ± did not differ from that of Groups PP and CC to S1.  相似文献   

6.
The effects of trial (T) and intertrial (I) durations were examined in two Pavlovian conditioning experiments with rats, in which a noise conditioned stimulus (CS) was paired with food delivery. In Experiment 1,T was either 10 or 20 sec, andI ranged from 15 to 960 sec, in separate groups of rats. The acquisition rate and final level of conditioned responding showed ratio invariance: They were better predicted by theI/T ratio than byI orT alone. In Experiment 2, theI/T ratio was 6.0 in all the groups, andT was 20, 40, 80, or 160 sec. Ratio invariance was not observed: Despite the commonI/T ratio, the rate of acquisition, final level of conditioned responding, and the ability of the CS to block conditioning of another stimulus differed among the groups. At the same time, the temporal distribution of conditioned responding withinT was similar in all the groups throughout conditioning and extinction and showed superpositioning when normalized acrossT. Many but not all aspects of the data were consistent with scalar timing theory.  相似文献   

7.
An emerging form of assessment is the patchwork text, an application of assessment for learning, as opposed to assessment of learning. A framework for making choices in how to use patchwork texts in higher education courses is developed, drawing on prior research on, and use of, patchwork texts. These choices reflect the fundamental objectives of patchwork texts, namely continuous learning, deep learning, integrated understanding and critical self‐reflection, while also offering options for patchwork texts which can be tailored to particular courses and individual preferences.  相似文献   

8.
This article was written in January 1970 for The Cambridge Review and appeared in the issue of 29 May 1970. The author had University readers chiefly in mind; the stress would have been differently placed had it been written in the first place for the present journal, but it seemed best to keep the article in its original form apart from small corrections. It is printed here with the kind permission of the Editors of the Review.  相似文献   

9.
Group membership is a strong driver of everyday life in humans, influencing similarity judgments, trust choices, and learning processes. However, its ontogenetic development remains to be understood. This study investigated how group membership, age, sex, and identification with a team influenced 39- to 60-month-old children (N = 94) in a series of similarity, trust, and learning tasks. Group membership had the most influence on similarity and trust tasks, strongly biasing choices toward in-groups. In contrast, prior experience and identification with the team were the most important factors in the learning tasks. Finally, overimitation occurred most when the children's team, but not the opposite, displayed meaningless actions. Future work must investigate how these cognitive abilities combine during development to facilitate cultural processes.  相似文献   

10.
This study investigates whether asking early adolescents to evaluate the food choices of remote peers improves their own food selection. Participants were students from fifth (N = 219, Mage = 9.30 years) and sixth grades (N = 248, Mage = 10.28 years) of varying nationalities living in the United Arab Emirates (race and ethnicity were not collected). Students saw peers’ healthy or unhealthy food choices before picking their own food. In some conditions, students also critically evaluated the healthiness of the peers’ choices. Evaluation of peer choices led to healthier decisions (d = .53) to the point that it offsets the negative impact of observing unhealthy peer choices. This effect is larger for sixth graders compared to fifth graders.  相似文献   

11.
To evaluate the effects of sperm with different parameters and sources on the outcomes of intracytoplasmic sperm injection (ICSI), 1972 ICSI cycles were analyzed retrospectively. Groups 1 to 5 were composed of cycles using ejaculated sperm and were grouped according to sperm quantity, quality, and morphology into normal (288 cycles), or mild (329 cycles), moderate (522 cycles), severe (332 cycles), and extremely severe (171 cycles) oligozoospermia and/or asthenozoospermia and/or teratozoospermia (OAT) groups. Group 6 was composed of 250 cycles using testicular or epididymal sperm, and Group 7 consisted of 80 cycles using frozen-thawed sperm. We found that fertilization rates were gradually reduced from Groups 1 to 6, and reached statistical difference in Groups 5 and 6 (P<0.05). The high-quality embryo rate was higher in Group 1 than in Groups 2, 3, 5, 6, and 7 (P<0.05). No statistical differences were observed in the rates of embryo cleavage, clinical pregnancy, miscarriage, live-birth, premature birth, low birth weight, weeks of premature birth, average birth weight, or sex ratio for all seven groups (P>0.05). A total of nine cases of malformation were observed, with a malformation rate of 1.25% (9/719). In conclusion, different sperm sources and parameters can affect ICSI outcomes before embryo implantation. A full assessment of offspring malformation will require further study using a larger sample size.  相似文献   

12.
The sociology of education in New Zealand, as in other countries, is affected by the dilemma inherent to the discipline, namely: is it a sociology of education or a sociology for education? In this article I analyse three factors in which the dilemma is played out: ‘cultural oppositionism’ in the indigenous (kaupapa Maori) approach, critical policy research and the role of empirical research. I argue that a sociology for education is fundamentally weakened by its politicisation, a flaw not helped by the difficulties in drawing political goals from moral imperatives. In contrast a sociology of education, which uses the strengths of empirical research and theoretical analysis, offers the better hope of renewal for, what is, in New Zealand, a moribund discipline.  相似文献   

13.
The purpose of this study was to investigate the connotation of performance labels used in standard setting. For example, do the performance labels basic, proficient, and advanced hold different connotations than limited knowledge, satisfactory, and distinguished?If these terms hold different connotations, such differences may play a role in the standard-setting process. A nationally representative sample of participants (n = 167) provided connotation ratings to an online instrument containing an experimental manipulation. Results suggested that the selected terms themselves do hold different connotations. After definitions were provided with the terms, the differences in the evaluative nature of the labels were mitigated. However, some differences remained; the term limited knowledge was persistently perceived as less favorable than basic and apprentice, and satisfactory was persistently perceived as less favorable than proficient.  相似文献   

14.
The framework of German educational discourse of the twentieth century is so‐called geisteswissenschaftliche Pädagogik, or education as one of the humanities or arts rather than as a science. It triumphed around 1925 in the second half of the Weimar Republic. This article outlines in three steps the core elements of this educational discourse. First, it shows that the mode of thinking of the exponents of geisteswissenschaftliche Pädagogik was dualistic in a traditional Protestant manner. They juxtaposed empiry and Geist, plurality and unity, and outward and inward, and they favoured the inward unity and coherency of Geist. The contextual analysis shows, however, that the dualistic thought schema was virulent not only among German educationalists and philosophers, but also found strong expression in novelists and essayists like Thomas Mann, or the winner of the Nobel Prize for Literature, Rudolf Eucken. Mainstream thinkers criticised the plural systems of Western democracy and capitalism – first and foremost, however, American democracy and capitalism – which were seen to epitomise both of these “un‐German” movements. The true German nature was thought to be an inner spiritual life, which was originally religious and through the course of history came to characterise the whole of German life and thought. It was believed that this spiritual inner life was revealed best by German art, particularly German music. This resistance to empiricism led, and this is the second step, to two analogous notions of the totality or wholeness of the individual and the nation. Man is not understood to be merely an individual, but more importantly a “personhood” (Persönlichkeit), which was described as an inward spiritual life that arose through effort and self‐cultivation, or Bildung. In addition to this inward personhood, however, the conception of “nationhood,” a national spiritual life as Volksstaat, or the ethnocultural nation as detached and distinguished from the political sphere, is seen as important. The individual person can perfect himself only in the framework of the typical characteristics of his Volk – the German Volk. Western democracy and plurality are seen as an atomistic “aggregate of individuals” and juxtaposed against the German concept of the ethnocultural Nation, the Volk community composing an organic unity that transcends the individual. Bildung is the spiritual formation of integrated, cultivated personalities who would orient themselves to the Volk community. In the curriculum of true education, along with the German language the study of Heimat becomes the fundamental element. In contrast to specialised subjects, the contents of Heimat would reflect the organic in the world, the totality of life: in the Volk and in the spiritual‐mental unity within the Persönlichkeit. The two constructions – deepest roots in the tradition of the Volk on one side, and highest inner spirituality in the personality on the other – resulted in education that had to oscillate between lowest and highest and, through this, had to lose sight of empirical, that is, social and political, dimensions. This is the third step that the present article wants to address. The true understanding of education, according to the exponents of geisteswissenschaftliche Pädagogik, puts social and political issues in their only proper place: inside the inner 760 Daniel Tröhler personality. Politicisation of the German person had to take place in the context of Volksstaat, not in democracy. To be free meant the embedding of the individual into the harmonious beauty of the whole. This notion created a social and political vacuum between the lowest denominator or totality of the Germanic people and the highest whole or totality of the Germanic personality, so that education had to be given the attribution – one that continues to be variously described and affirmed in education research in the German‐language realm up to the present day – that education is autonomous, independent of social or political context. This was based on the term Bildung – the inner ideology set against a pluralistic world. Autonomy means insisting on the inner freedom of man, on his inner coherency, and his will. In the midst of the confusing simultaneous demands of society on youth, educational autonomy is believed to be a means of assuring human unity and wholeness; it serves a protective dam to contain the danger of persons being ripped apart or pulled hither and yon. With its goal of awakening a unified spiritual life against the modern plural democratic world, the true educational community becomes crucial.  相似文献   

15.
This study reports on a pilot project in performance funding. A stratified random sample of 112 seniors at Tennessee Technological University participated in a special assessment exercise involving the ACT Battery and the ACT COMP (College Outcome Measures Project). The participants also completed a questionnaire designed to elicit self-reports of progress toward the realization of a set of institution-wide or general education goals. This article explores the relationships between objective ortest performance and subjective orstudent testimony instructional outcomes measures. Its specific focus is upon assessing the construct validity of student testimony data as indicators of selected general education outcomes. The implications of the findings for the better-informed selection, implementation, and interpretation of instructional outcomes measures are discussed.Presented at the Nineteenth Annual Forum of the Association for Institutional Research, San Diego, California, May 1979.  相似文献   

16.
Rats trained to push a joystick to the left or right for food reward were given two successive tests in which neither response was reinforced. Prior to Test 1, subjects were either confined in the apparatus with a passive conspecific (Group None), or allowed to observe a conspecific demonstrator making 50 nonreinforced responses in the direction that had beeirrewarded during observer training (Group Same) or in the opposite direction (Group Different). In Test 1, Group Same made fewer previously reinforced responses than did Group Different, which made fewer than Group None, and Groups Same and Different each made fewer previously nonreinforced responses than did Group None. In Test 2, Group Same made fewer previously reinforced responses than did Group None. These results indicate that observation of nonreinforced responding can reduce resistance to extinction (Test 1) and spontaneous recovery (Test 2) in rats.  相似文献   

17.
ABSTRACT

Women are underrepresented in Science, Technology, Engineering and Mathematics subjects with more girls leaving these subjects at every stage in education. The current research used a scenario methodology to examine the impact of teacher feedback on girls’ and boys’ choices to study a specific science subject, engineering. British participants aged 13 (N?=?479) were given scenarios where a new teacher encouraged them to take engineering using person feedback which focussed on their abilities, process feedback which focussed on their effort levels or gave them no reason. Results suggested that both boys and girls were more likely to select to study engineering when they received person feedback rather than process or no feedback. Young people also thought that ability was more important to being successful in science than in non-science subjects.This suggests young people feel that ability is needed to succeed in science subjects and person feedback can lead them to believe that they have this ability. Therefore, teacher feedback which gives ability attributions for possible success could be used to encourage more young people to persist in science. However, the potentially negative longer term outcomes of ability attributions and how they may be negated are also discussed.  相似文献   

18.
A hurdle-jump escape response was employed to assess the laboratory rat’s aversion or attraction to different types of conspecific odor. Odorant donor subjects received 112 runway acquisition trials on a continuous reward schedule followed by 32 extinction trials, 112 acquisition trials on a 50% schedule of reward and nonreward followed by 32 extinction trials, or 144 “neutral” trials with no reward in the alley. Different groups of test subjects escaped from odor excreted by odorant subjects on (a) nonrewarded acquisition and extinction trials, (b) rewarded trials during continuous reinforcement, (c) rewarded trials during partial reinforcement, or (d) neutral trials; others escaped from a clean box. The principal findings were: (1) significant aversion to “odor of nonreward” appeared after the donor odorants had received 12 exposures to reward; (2) production of odor of nonreward by odorant subjects changed as a function of training experience with reward; (3) after repeated exposure to odor of nonreward, the escape response habituated; (4) greater or different odor excretion in extinction resulted from subjects trained on a continuous reward schedule than on a partial reward schedule. Relationships of the data to frustration theory were discussed, assuming that inferred differences in production of odor reflect differences in frustration reaction.  相似文献   

19.
According to the dual systems model of adolescent risk taking, sensation seeking and impulse control follow different developmental trajectories across adolescence and are governed by two different brain systems. The authors tested whether different underlying processes also drive age differences in reward approach and cost avoidance. Using a modified Iowa Gambling Task in a multinational, cross‐sectional sample of 3,234 adolescents (ages 9–17; M = 12.87, SD = 2.36), pubertal maturation, but not age, predicted reward approach, mediated through higher sensation seeking. In contrast, age, but not pubertal maturation, predicted increased cost avoidance, mediated through greater impulse control. These findings add to evidence that adolescent behavior is best understood as the product of two interacting, but independently developing, brain systems.  相似文献   

20.
Abstract

Quantitative Reasoning for Business is a two-semester sequence that serves as an alternative to elementary and intermediate algebra for first-year business students with weak mathematical preparation. Students who take the sequence have been retained at a higher rate and demonstrated a larger reduction in math anxiety than those who take the traditional developmental courses. We share the challenges that led to our choices in adopting and modifying inquiry-based instruction in order to serve our population.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号