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1.
Three experiments were undertaken to examine the effects of interactions with demonstrator rats made ill by injection of lithium chloride (LiCl) on the later food choices of their observers. We found that (1) observer rats that had been taught an aversion to an unfamiliar diet exhibited a substantial reduction of that aversion after interacting with poisoned demonstrators that had eaten the diet to which the observers had learned an aversion, (2) exposure of an observer rat to poisoned demonstrator rats that had eaten a diet interfered with later acquisition by the observer of an aversion to the diet that the poisoned demonstrators had eaten, and (3) after interacting with poisoned demonstrators that had eaten one of two diets, observers that ate both diets and were then made ill formed an aversion to whichever diet their respective, poisoned demonstrators had not eaten. The present experiments, like previous studies both in our laboratory and elsewhere, failed to provide any evidence that naive observer rats will learn to avoid a food as a result of interacting with demonstrator rats that had eaten the food and exhibit symptoms of toxicosis. To the contrary, observer rats in the present experiments exhibited an enhanced preference for foods eaten by sick demonstrators. 相似文献
2.
Rats injected with lithium chloride after ingesting familiar food pellets presented in textured metal sleeves learned aversions to the sleeved food. In a choice between sleeved and unsleeved food, the aversions were evident following conditioning with toxicosis delayed as long as 120 min after exposure to the sleeved food (Experiment 1). Texture-specific aversions resulted from procedures in which rats were exposed to food in both rough- and smooth-textured sleeves but were injected with lithium only in conjunction with one of the textures (Experiments 2–4). This differential aversion learning occurred when lithium treatment was delayed 30 min after exposure to the sleeved food (Experiments 3 and 4) and was equally evident in rats conditioned and tested in total darkness or in normal room-level illumination (Experiment 4). However, differential texture aversion learning was not observed with 90- or 300-min delayed toxicosis (Experiment 3). The present experiments highlight the importance of tactile cues in the poison-avoidance learning of species that handle their food during the course of ingestion. 相似文献
3.
James W. Kalat 《Learning & behavior》1976,4(1):96-98
It has been reported that increases in volume drunk of a solution, prior to poisoning, lead to greater learned aversions. However, this effect may be due totally or partially to differences in time spent drinking rather than to amount drunk. When duration of drinking is held constant, rats differ spontaneously in how much of a solution they drink. In 29 experimental groups, varying in procedural details, the correlation between amount drunk on the training day and percent preference for the solution on the test day (the opposite of aversion) was positive in 16 cases, negative in 13, and usually low. Regardless of whether volume drunk affects taste-aversion learning under some conditions, evidently it is sufficient to control duration of drinking rather than volume, since the spontaneously occurring variations in volume have only slight, if any, effects on the individual differences in learned aversion. 相似文献
4.
Bennett G. Galef Brigitte Rudolf Elaine E. Whiskin Elena Choleris Marisa Mainardi Paola Valsecchi 《Learning & behavior》1998,26(4):448-454
In recent experiments in which the social influences on feeding in Mongolian gerbils were investigated, observer gerbils acquired food preferences from conspecific demonstrators only if the demonstrators and observers were either related or familiar. Even then, the effects of demonstrator gerbils on observers’ food choices lasted less than 24 h. In similar experiments with Norway rats, the familiarity/relatedness of demonstrators and observers had little effect on social learning, and the demonstrators’ influence on observers’ food choices lasted many days. We examined the causes of these differences and found that, after observer gerbils interacted with either unfamiliar or familiar conspecific demonstrators that had been fed using procedures typically used to feed demonstrator rats, they showed long-lasting social learning about foods, whereas observer rats interacting with conspecific demonstrators that had been fed as demonstrator gerbils normally are fed showed effects of familiarity/relatedness to demonstrators on their social learning about foods. Procedural differences, rather than species differences, seem to be responsible for reported inconsistencies in social learning about foods by rats and gerbils. 相似文献
5.
Bennett G. Galef 《Learning & behavior》1989,17(4):468-474
After interacting with rat demonstrators that had eaten a novel, palatable diet, many observer rats exhibited either attenuation or total blockade of their subsequent acquisition of a lithium-chloride-induced aversion to that diet. In natural circumstances, such social attenuation of aversion learning could prevent new recruits to a population (weanlings or recent immigrants) from learning maladaptive aversions (“food phobias”) to tainted or spoiled samples of normally safe foods that others of their social group were eating. 相似文献
6.
两个实验采用联结学习范式,分别探讨知觉类别和语义类别材料中,类别感知对特征学习的影响.结果发现,即使是在联结学习范式中,当学习者感知学习材料存在类别时,不仅关注可以有效预测结果的特征,也会关注类别中的其他特征.同时,在知觉类别和语义类别材科中都发现了相同的结果.本实验结果说明,当学习者感知学习材料中存在类别时,即使是在联结学习范式中,学习者也会像类别学习范式中一样,学习额外特征,支持对存在类别的感知,是影响学习者特征学习的重要原因. 相似文献
7.
Constructing knowledge with an agent-based instructional program: A comparison of cooperative and individual meaning making 总被引：2，自引：2，他引：0
Participants in the present study were 87 college students who learned about botany using an agent-based instructional program with three different learning approaches: individual, jigsaw, or cooperative learning. Results showed no differences among learning approaches on retention. Students in jigsaw groups reported higher cognitive load during learning than students who learned individually; scored lower on a problem-solving transfer test than students in individual and cooperative learning groups; and were less likely to produce elaborated explanations and co-construct knowledge with their peers than students in cooperative groups. Students in cooperative groups reported higher situational interest than their counterparts. Implications for cooperative and individual meaning making in agent-based instructional programs are discussed and future research directions are suggested. 相似文献
8.
We review socially biased learning about food and problem solving in monkeys, relying especially on studies with tufted capuchin
monkeys (Cebus apella) and callitrichid monkeys. Capuchin monkeys most effectively learn to solve a new problem when they can act jointly with
an experienced partner in a socially tolerant setting and when the problem can be solved by direct action on an object or
substrate, but they do not learn by imitation. Capuchin monkeys are motivated to eat foods, whether familiar or novel, when
they are with others that are eating, regardless of what the others are eating. Thus, social bias in learning about foods
is indirect and mediated by facilitation of feeding. In most respects, social biases in learning are similar in capuchins
and callitrichids, except that callitrichids provide more specific behavioral cues to others about the availability and palatability
of foods. Callitrichids generally are more tolerant toward group members and coordinate their activity in space and time more
closely than capuchins do. These characteristics support stronger social biases in learning in callitrichids than in capuchins
in some situations. On the other hand, callitrichids’ more limited range of manipulative behaviors, greater neophobia, and
greater sensitivity to the risk of predation restricts what these monkeys learn in comparison with capuchins. We suggest that
socially biased learning is always the collective outcome of interacting physical, social, and individual factors, and that
differences across populations and species in social bias in learning reflect variations in all these dimensions. Progress
in understanding socially biased learning in nonhuman species will be aided by the development of appropriately detailed models
of the richly interconnected processes affecting learning. 相似文献
9.
《The Internet and Higher Education》2003,6(2):193-204
The purpose of this research was to measure pre-service teachers' attitudes toward information technology (IT) following their participation in a discrete IT course. The IT course was taught in a constructivist learning environment where the students collaborated to achieve their learning goals and problem solve on tasks [Educ. Technol. 35 (1995) 25]. The results of the study revealed that with the constructivist learning approach infused in the IT course, there was a positive shift in the participants' attitudes toward IT. Pretest results showed that participants who were competent had regarded IT as more useful; and they had more confidence and less aversion toward technology. The posttest results showed increased mean scores on all three dependent variables (e.g., usefulness, confidence, and aversion) with no differences between competent and incompetent participants by the end of the course. The responses obtained from interviews of course instructors indicated that participants were more independent, more creative, and used their collaborative learning skills. While an exploratory study, the results provide support for the premise that infusing constructivism into a discrete IT course can enhance positive attitudes towards IT and enable students to be active participants in their own learning process. 相似文献
10.
Eric W. Holman 《Learning & behavior》1976,4(3):329-332
In Experiment I, rats received eight habituation injections of either lithium chloride (LiCl) or sodium chloride (NaCl), then two aversion training trials in which access to saccharin solution was followed by LiCl injections, and finally eight extinction trials with saccharin but no injections. The rats habituated to LiCl showed less aversion to saccharin during training and extinction. In Experiment II, rats received two aversion training trials, then eight habituation trials to either LiCl or NaCl, then eight extinction trials, four more aversion training trials, and eight more extinction trials. The rats habituated to LiCl did not differ during the first extinction period from those habituated to NaCl, but showed less aversion to saccharin during the second training and extinction periods. Consequently, habituation to LiCl reduces the learning of an aversion to saccharin but does not reduce the performance of a previously learned aversion. 相似文献
11.
Stephen A. Shumake Ray T. Sterner Stanley E. Gaddis Kenneth A. Crane 《Learning & behavior》1982,10(4):499-504
The effects of select drugs, dosages, and modes of administration upon learned taste aversions were compared among groups of wild-caught male and female Philippine rice rats (R. r. mindanensis). Experiment 1 compared two-choice saccharin aversions for 28 days among groups intubated with copper sulfate, cyclophosphamide, lithium chloride, red squill, sodium chloride (control), or deionized water (control). Main results were that 375 mg/kg lithium chloride produced the greatest sustained aversions, whereas 198 mg/kg cyclophosphamide and 210 mg/kg red squill produced moderate aversions, with males showing more resistance to extinction than females. Experiment 2 compared saccharin aversion among matched groups of male and female rats that received low (36 mg/kg), moderate (105 mg/kg), or high (368 mg/kg) dosages of lithium by gavage, ip injection, or ingestion. Sex differences in rates of extinction were found for the ingestion and injection-dosed rats, but no sex difference was again found for rats dosed by gavage. A significant mode × day interaction indicated that extinction progressed more rapidly for rats dosed by gavage. For all modes of administration, high dosages yielded intense 28-day aversion, moderate dosages produced intermediate 3–5 day aversion, and low dosages caused no aversion. 相似文献
12.
Nonreinforced exposure to a cue tends to attenuate subsequent conditioning with that cue—an effect referred to as latent inhibition (LI). In the two experiments reported here, we examined LI effects in the context of conditioned taste aversion by examining both the amount of consumption and the microstructure of the consummatory behavior (in terms of the mean size of lick clusters). The latter measure can be taken to reflect affective responses to, or the palatability of, the solution being consumed. In both experiments, exposure to a to-be-conditioned flavor prior to pairing the flavor with nausea produced by lithium chloride attenuated both the reduction in consumption and the reduction in lick cluster sizes typically produced by taste aversion learning. In addition, we observed a tendency (especially in the lick cluster measure) for nonreinforced exposure to reduce neophobic responses to the test flavors. Taken together, these results reinforce the suggestion from previous experiments using taste reactivity methods that LI attenuates the effects of taste aversion on both consumption and cue palatability. The present results also support the suggestion that the failure in previous studies to see concurrent LI effects on consumption and palatability was due to a context specificity produced by the oral taste infusion methods required for taste reactivity analyses. Finally, the fact that the pattern of extinction of conditioned changes in consumption and in lick cluster sizes was not affected by preexposure to the cue flavors suggests that LI influenced the quantity but not the quality of conditioned taste aversion. 相似文献
13.
In four experiments using rat subjects, we investigated the effects of presenting a novel flavor cue at the time of pairing an environmental context with illness. In each experiment, the subjects were allowed to spend time in a distinctive cage before receiving an injection of LiCl. For some, plain water was made available on these conditioning trials; for others, a novel taste (HCl) was presented. We measured the strength of the context aversion by assessing the ability of the contextual cues to block the acquisition of an aversion to sucrose in a further phase of training. We found that initial training with HCl present made the context less effective as a blocking cue and concluded that the HCl had overshadowed learning about the context. We suggest that this blocking procedure provides a more accurate assessment of contextual aversion than does the consumption test that has more usually been used and that taste-context overshadowing may be a more robust phenomenon than has thus far been thought. 相似文献
14.
Wong Su Luan Kamariah Abu Bakar Tang Sai Hong 《Technology, Pedagogy and Education》2013,22(2):223-238
The purpose of this study was to measure pre‐service teachers’ attitudes toward information technology (IT) after completing a discrete IT course taught in a student centred‐learning (SCL) environment during laboratory sessions. Evidence from this study suggests that there was a positive shift in the participants’ attitudes toward IT. Pre‐test results showed that IT‐competent participants who regarded IT as useful had more confidence and less aversion toward IT. Post‐test results showed increased mean scores on all three dependent variables with no differences between IT‐competent and low IT‐competent participants. The results were supported by interviews which indicate that after completing the IT course, participants were more independent, more creative and possessed collaborative learning skills. The results suggest that infusing SCL into a discrete IT course can help promote and enhance positive attitudes toward IT and enable students to be active participants in their own learning process. 相似文献
15.
Catherine C. Chase Doris B. Chin Marily A. Oppezzo Daniel L. Schwartz 《Journal of Science Education and Technology》2009,18(4):334-352
Betty’s Brain is a computer-based learning environment that capitalizes on the social aspects of learning. In Betty’s Brain, students instruct a character called a Teachable Agent (TA) which can reason based on how it is taught. Two studies demonstrate the protégé effect: students make greater effort to learn for their TAs than they do for themselves. The first study involved 8th-grade students learning biology. Although all students worked with the same Betty’s Brain software, students in the TA condition believed they were teaching their TAs, while in another condition, they believed they were learning for themselves. TA students spent more time on learning activities (e.g., reading) and also learned more. These beneficial effects were most pronounced for lower achieving children. The second study used a verbal protocol with 5th-grade students to determine the possible causes of the protégé effect. As before, students learned either for their TAs or for themselves. Like study 1, students in the TA condition spent more time on learning activities. These children treated their TAs socially by attributing mental states and responsibility to them. They were also more likely to acknowledge errors by displaying negative affect and making attributions for the causes of failures. Perhaps having a TA invokes a sense of responsibility that motivates learning, provides an environment in which knowledge can be improved through revision, and protects students’ egos from the psychological ramifications of failure. 相似文献
16.
Bennett G. Galef 《Learning & behavior》1987,15(3):327-332
In the present experiments, a naive “observer” rat first interacted with a “demonstrator” rat previously fed a diet unfamiliar to the observer. The observer then sampled two unfamiliar diets, one of which was the diet its demonstrator had eaten. The observer was then injected with LiCl and, following recovery from toxicosis, was offered a choice between the two diets it sampled prior to toxicosis induction. It was found that: (1) each observer rat formed an aversion to whichever diet its demonstrator had not eaten, (2) effects of demonstrators on aversion learning by observers were present even if there was a 7- or 8-day delay between interaction of a demonstrator and observer and diet sampling by the observer, and (3) observers interacting with 3 demonstrators, each fed a different diet, subsequently exhibited a reduced tendency to form an aversion to each of the diets eaten by their demonstrators. Taken together, the results indicate that information acquired from conspecifics as to the diets they have eaten can play an important role in determining the foods to which otherwise naive rats will learn aversions. 相似文献
17.
Muhamad Hugerat 《Learning Environments Research》2016,19(3):383-395
This study involved 458 ninth-grade students from two different Arab middle schools in Israel. Half of the students learned science using project-based learning strategies and the other half learned using traditional methods (non-project-based). The classes were heterogeneous regarding their achievements in the sciences. The adapted questionnaire contained 38 statements concerning students’ perceptions of the science classroom climate. The results of the study revealed that students who learned sciences by project-based teaching strategies perceived their classroom learning climate as significantly more Satisfying and Enjoyable, with greater Teacher Supportiveness, and the Teacher–Student Relationships as significantly more positive. The differences between the experimental (project-based learning strategies) and control (non-project) groups regarding their perceptions of the science classroom learning climate could be explained by differences between the two science teaching and learning strategies. 相似文献
18.
Taking a test generally improves the retention of the material tested. This is a phenomenon commonly referred to as testing effect. The present research investigated whether two-tier diagnostic tests promoted student teachers’ conceptual understanding of variables in conducting scientific experiments, which is a scientific process skill. In this study, 97 preservice science teachers were divided into three groups. All three groups took a physics laboratory course during the fall term in which they learned about variables in the course. Each group was engaged in a different learning activity after the physics laboratory course: taking a two-tier diagnostic test, taking a multiple choice test, or studying a lecture summary. The narratives of the participants before and after the learning activities were transcribed into a format of flow maps to assess their conceptual understanding of variables. The results revealed that the two-tier diagnostic test is an effective tool in promoting conceptual understanding of complex concepts about variables in conducting scientific experiments. 相似文献
19.
Virtual reality (VR) is predicted to create a paradigm shift in education and training, but there is little empirical evidence of its educational value. The main objectives of this study were to determine the consequences of adding immersive VR to virtual learning simulations, and to investigate whether the principles of multimedia learning generalize to immersive VR. Furthermore, electroencephalogram (EEG) was used to obtain a direct measure of cognitive processing during learning. A sample of 52 university students participated in a 2 × 2 experimental cross-panel design wherein students learned from a science simulation via a desktop display (PC) or a head-mounted display (VR); and the simulations contained on-screen text or on-screen text with narration. Across both text versions, students reported being more present in the VR condition (d = 1.30); but they learned less (d = 0.80), and had significantly higher cognitive load based on the EEG measure (d = 0.59). In spite of its motivating properties (as reflected in presence ratings), learning science in VR may overload and distract the learner (as reflected in EEG measures of cognitive load), resulting in less opportunity to build learning outcomes (as reflected in poorer learning outcome test performance). 相似文献
20.
Do classroom exemplars promote the application of principles in teacher education? A comparison of videos,animations, and narratives 总被引：2，自引：1，他引：1
Roxana Moreno Ludmila Ortegano-Layne 《Educational technology research and development : ETR & D》2008,56(4):449-465
Students learned about teaching principles with a multimedia program that either did not include a classroom exemplar illustrating
how to apply the learned principles to the teaching practice (control group) or included a classroom exemplar in video, animation,
or text format. Across two experiments, video and animation groups reported more favorable attitudes towards learning and
were better able to apply the learned principles than the control group. Text and control groups did not differ in their learning
or attitudes towards learning, suggesting that format is an important factor in determining the effectiveness of classroom
exemplars as pedagogical tools for teacher education. Results encourage the use of visual classroom exemplars to promote the
application of theory into practice. 相似文献