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1.
In three experiments, we studied the consequences of ejaculation upon the frustrative or contrast response of male rats exposed
to reward downshift situations (i.e., surprising changes from 32% to 4% sucrose solutions). Similar to what has been found
after treatment with anxiolytic agents, consummatory suppression was partially reversed by previous ejaculations in a second
postshift trial (Experiments 2 and 3), such a result not having been obtained in a first postshift trial (Experiment 1). Moreover,
the effect of ejaculations upon males' behavior during a second postshift trial was transitory, disappearing when assessed
during the third and fourth postshift trials (Experiment 3). These results are in accordance with both Amsel's (1958, 1992)
frustration theory and Flaherty's (1996) multistage hypothesis of successive negative contrast; the diverse factors that are
known to modulate contrast effects are considered, including an interpretation of the present data in terms of the anxiolytic-like
effect of the ejaculation. 相似文献
2.
Numerical competence has been studied in animals under a variety of conditions, but only a few experiments have reported animals’
ability to detect absolute number. Capaldi and Miller (1988) tested rats’ ability to detect absolute number by using biologically
important events—the number of reinforced runs followed by a nonreinforced run—and found that the rats ran significantly slower
on the nonreinforced run. In the present experiments, we used a similar procedure. Pigeons were given a sequence of trials
in which responding on the first three trials ended in reinforcement but responding on the fourth trial did not (RRRN). When
the response requirement on each trial was a single peck (Experiment 1), we found no significant increase in latency to peck
on the fourth trial. When the response requirement was increased to 10 pecks (Experiment 2), however, the time to complete
the peck requirement was significantly longer on the nonreinforced trial than on the reinforced trials. Tests for control
by time, number of responses, and amount of food consumed indicated that the pigeons were using primarily the number of reinforcements
obtained in each sequence as a cue for nonreinforcement. This procedure represents a sensitive and efficient method for studying
numerical competence in animals. 相似文献
3.
Two experiments used rats in a conditioned lick suppression preparation to investigate how the conditioned stimulus (CS)-duration
and partial-reinforcement effects (i.e., weakened responding due to conditioning with a CS of longer duration and presenting
nonreinforced CSs intermingled with CS—unconditioned stimulus [US] pairings, respectively) interact with overshadowing. Experiment
1 found that when overshadowing treatment was combined with either extended CS duration or partial reinforcement, the response
deficit was weaker than when either of these three treatments was administered alone. In Experiment 2, the generality of the
findings in Experiment 1 was investigated by replicating it with various US—US intervals. This time counteraction was observed
only when both the absolute duration of total CS exposure and the US—US interval were short. The results support neither the
view that the ratio between the total CS exposure and total time in the context determines the CS-duration and the partial-reinforcement
effects nor the view that these two effects arise from a loss of effectiveness of the excitatory CS—US association during
CS-alone exposures in partial reinforcement or early periods of CS exposure with long CSs. 相似文献
4.
Three experiments demonstrated that, following the extinction of an established conditioned stimulus (CSA—e.g., tone), the
pairing of a novel, cross-modal stimulus (CSB—e.g., light) with the unconditioned stimulus (US) results in strong recovery
of responding to the extinguished CSA. Experiment 1 demonstrated that the recovery of responding to CSA is not the result
of US reinstatement but is attributable to pairings of CSB with the US. Experiment 2 demonstrated that the recovery of responding
is specific to CSA and is not the result of cross-modal generalization. Experiment 3 revealed that a large number of CSB-US
pairings in Stage 1 significantly reduced the amount of recovery to CSA during subsequent CSB-US trials. Experiment 3 also
provided unexpected evidence of cross-modal secondary extinction. The extinction and subsequent recovery of responding seen
in the present experiments is discussed with respect to possible contributions from contextual associations, CS processing,
US processing, conditioned response expression, and layered excitatory associations. 相似文献
5.
Male Japanese quail learned to approach a light that predicted visual exposure to a female quail. In Experiment 1, duration of visual exposure to the female did not systematically affect the speed or strength of conditioning. Introduction of an omission contingency for approach to the light after acquisition did not suppress conditioned approach relative to the performance of yoked controls. In Experiment 2, males learned to approach a light that predicted visual exposure to a female despite an omission contingency for approach in effect during acquisition. Experimental males were not slower to acquire the approach response under an omission contingency than were yoked controls. The findings indicate strong Pavlovian control of sexual conditioned approach in Japanese quail. 相似文献
6.
Louis D. Matzel 《Learning & behavior》1985,13(2):187-193
A series of experiments used food-deprived pigeons to examine several parameters of reinforcement omission in an attempt to control changes of keypeck response measures on a subsequent schedule. In Experiments 1 and 2, the pigeons were tested with a multiple fixed-ratio schedule on which reinforcement was occasionally omitted at the completion of the first component. The duration of the delay occurring in lieu of reinforcement was systematically varied. In Experiment 3, the stimulus that signaled the second component of the schedule was altered to appear either more or less similar to the stimulus that signaled the first component. Two principal results are reported: (1) Response latency decreased and, to a much lesser extent, terminal response rate increased as the delay occurring in lieu of reinforcement decreased; and (2) both latency decrease and response-rate increase were enhanced by a second component stimulus which was similar to the first. The results are evaluated in terms of Amsel’s frustration theory and an analysis by Staddon which suggests that reinforcement inhibits responding. The data appear to support Staddon’s argument that rate increases and latency decreases following reinforcement omission are largely a function of an attenuation of the inhibitory influence of reinforcement, an effect that is enhanced by stimulus generalization. Accordingly, it is proposed that an animal’s response to reinforcement omission is determined by a stimulus complex that minimally includes the omission event and component cues. 相似文献
7.
In two experiments, two groups of rats were trained in a navigation task according to either a continuous or a partial schedule
of reinforcement. In Experiment 1, animals that were given continuous reinforcement extinguished the spatial response of approaching
the goal location more readily than animals given partial reinforcement—a partial reinforcement extinction effect. In Experiment
2, after partially or continuously reinforced training, animals were trained in a new task that made use of the same reinforcer
according to a continuous reinforcement schedule. Animals initially given partial reinforcement performed better in the novel
task than did rats initially given continuous reinforcement. These results replicate, in the spatial domain, well-known partial
reinforcement phenomena typically observed in the context of Pavlovian and instrumental conditioning, suggesting that similar
principles govern spatial and associative learning. The results reported support the notion that salience modulation processes
play a key role in determining partial reinforcement effects. 相似文献
8.
In three experiments with rat subjects, we examined the effects of trial spacing in appetitive conditioning. Previous research
in this preparation suggests that self-generated priming of the conditional stimulus (CS) and/or unconditional stimulus (US)
in short-term memory is a cause of the trial-spacing effect that occurs with intertrial intervals (ITIs) of less than 240
sec. Experiment 1 nonetheless showed that a trial-spacing effect still occurs when ITIs are increased beyond 240 sec, and
that the effect of ITI over 60–1,920 sec on conditioned responding is best described as a linear function. In Experiment 2,
some subjects were removed from the context during the ITIs, preventing extinction of the context. Removal abolished the advantage
of the long ITI, suggesting the importance of exposure to the context during the long ITI. Experiment 3 still produced a trial-spacing
effect in a within-subjects design that controlled for the level of context conditioning and reinforcement rate in the absence
of the CS. Overall, the results are most consistent with the idea that adding time to the ITI above 240 sec facilitates conditioning
by extinguishing context-CS associations—and possibly context-US associations—that otherwise interfere with CS-US learning
through retrieval-generated priming (see, e.g., Wagner, 1981). 相似文献
9.
Identification of distinct units within a continuous flow of human action is fundamental to action processing. Such segmentation
may rest in part on statistical learning. In a series of four experiments, we examined what types of statistics people can
use to segment a continuous stream involving many brief, goal-directed action elements. The results of Experiment 1 showed no evidence for sensitivity to conditional probability, whereas Experiment 2 displayed learning based on joint probability. In Experiment 3, we demonstrated that additional exposure to the input failed to engender sensitivity to conditional probability. However,
the results of Experiment 4 showed that a subset of adults—namely, those more successful at identifying actions that had been seen more frequently than
comparison sequences—were also successful at learning conditional-probability statistics. These experiments help to clarify the mechanisms subserving processing
of intentional action, and they highlight important differences from, as well as similarities to, prior studies of statistical
learning in other domains, including language. 相似文献
10.
In three experiments, we examined the effect on the patterns of responding noted on fixed interval (FI) schedules of prior
exposure to a range of interval and ratio schedules. Rats leverpressed for food reinforcement on random ratio (RR), random
interval (RI), or variable interval (VI) schedules prior to transfer to FI schedules. In Experiment 1, prior exposure to an
RR schedule retarded the development of typical FI patterns of responding. Exposure to a yoked RI schedule produced even greater
retardation of typical FI performance. This effect was replicated in Experiment 2, using a within-subjects design. Rats responded
on a multiple RR-RI schedule prior to a multiple FI-FI schedule. Typical FI performance emerged more slowly in the component
previously associated with the RI than with that associated with the RR. In Experiment 3, exposure to an RR schedule retarded
the development of FI performance to a greater extent than did exposure to a VR schedule. The latter schedule was programmed
to allow the possibility that inhibitory control would develop after reinforcement. These results confirm that ratio schedules
independently result in the disruption of FI responding. This effect was not long lasting and cannot be used plausibly to
explain species differences in responding to FI schedules. However, it does suggest that temporal control—as manifested by
the transfer of inhibitory control from one schedule to another—could facilitate movement between interval schedules. 相似文献
11.
Three experiments were conducted with male domesticated quail to explore whether sexual responses to a three-dimensional conditioned stimulus (CS) object could be acquired through observation. Observational learning was measured by a savings test in which the observers received exposures to the CS paired with the opportunity to copulate with a female bird (the unconditioned stimulus, or US). In all of the experiments, observing a demonstrator copulate with the CS object and then receive access to the US facilitated the subsequent conditioning of the observers. This facilitation effect was not due to observation of just another male bird (Experiment 1) or observation of a male bird that copulated with the CS object (Experiment 2). Rather, the critical factor was observation of pairings of the CS object with the US. Facilitated sexual conditioning was evident in groups of birds that observed pairings of the CS and US, whether or not they witnessed a demonstrator copulating with the CS object (Experiment 3). 相似文献
12.
Rats’ leverpressing was reinforced on variable-ratio (VR) schedules. As ratio values increased, response rates initially increased with them, then eventually decreased. In Experiment 1, rates were uniformly higher with one-pellet reinforcers than with two-pellet reinforcers—theparadoxical incentive effect. Killeen’s (1994) mathematical principles of reinforcement (MPR) described the data quantitatively but failed to predict the advantage for the one-pellet condition. In Experiment 2, rats received one-, two-, and three-pellet reinforcers with counterbalanced preloads of pellets; the continued superiority of the smaller reinforcers ruled out a satiation explanation. Experiment 3 introduced a 20-sec intertrial interval (ITI), and Experiment 4 filled the ITI with an alternate response to test a memorial/overshadowing explanation. In Experiment 5, the rats received one or two standard grain pellets or one sucrose pellet as reinforcers over an extended range of ratios. Once again, rates were higher for one than for two pellets at short to moderate VR values; thereafter, two pellets supported higher response rates. The diminution of the effect in Experiment 3 and its reversal in Experiment 4 and in Experiment 5 at large ratios provided evidence for overshadowing and reconciled the phenomenon with MPR. 相似文献
13.
The effects of identical context on pattern recognition by pigeons for outline drawings of faces were investigated by training
pigeons to identify (Experiment 1) and categorize (Experiment 2) these stimuli according to the orientation of the mouth—an
upright U shape representing a smiling mouth or an inverted U shape representing a sad mouth. These target stimuli were presented
alone (Pair 1), with three dots in a triangular orientation to represent a nose and eyes (Pair 2), and with the face pattern
surrounded by an oval (Pair 3). In Experiment 1, the pigeons trained with Pair 1 were most accurate, those trained with Pair
2 were less so, and those trained with Pair 3 failed to acquire the discrimination within eighty 100-trial sessions. The same
ordering was found in Experiment 2 for pigeons trained on the three pairs simultaneously. The authors suggest that a contrasting
finding in humans, the face superiority effect, might be due to a gain in discriminability resulting from recognition of the
pattern as a face. An exemplar model of information processing that excludes linguistic coding accounts for the present results. 相似文献
14.
Marielle L. J. Le Mat 《Sex education》2017,17(4):413-424
Comprehensive sexuality education which includes discussion about gender and power is increasingly seen as an effective way of promoting sexual and reproductive health and rights. Yet all too often the potential of good quality sexuality education is not realised. This study engages with young peoples’ evaluation of a sexuality education programme in Ethiopia. Using data from ethnographic field notes, focus group discussions and interviews with students, teachers and sexual and reproductive health workers in Oromia region, it reveals the existence of gendered practices in sexuality education. Three forms of exclusion were evident: first, exclusion through selection to participate in the programme; second, exclusion of the views of young people through gendered interpretations and practices; third, exclusion of the views of young people through the omission of discussion on topics that are relevant to them, such as love, relationships and sexual intercourse. As a result, the programme’s potential to contribute to questioning gender relations and improving the emotional and sexual health of young people is undermined. The programme reproduces a gender order in school and arguably broader society, which is a source of frustration and alienation for young people. 相似文献
15.
When the conditioned stimulus (CS) is located some distance from the unconditioned stimulus (US), pairings of the CS and US can yield either conditioned approach to the CS (sign tracking) or conditioned approach to the US (goal tracking). However, goal tracking is the more common outcome, and, because of that, goal tracking has come to serve as a “standard” measure of associative learning in several laboratories. In contrast, in previous studies of sexual conditioning with domesticated quail, only sign tracking was observed. In the present study, quail continued to show sign tracking rather than goal tracking whether or not the US was highly localized (Experiment 1), whether food or a sexual US was used (Experiment 2), whether the CS was mobile or immobile (Experiment 3), and whether the CS was 91 or 233 cm from the US compartment (Experiment 4). The present findings encourage caution in the routine use of goal tracking as a measure of learning. The possible mechanisms of goal tracking are discussed in terms of occasion setting and behavior systems theory. 相似文献
16.
The generality of the frustration effect in an aversive stimulus conditioning procedure was examined by training and testing 40 rats in a double cold-waterway escape conditioning apparatus. Experimental and control procedures analogous to appetitive conditioning experiments (e.g., Amsel & Roussel, 1952; Wagner. 1959) indicated that frustrative nonrelief (i.e., reinforcement omission) in the first goal tank yielded significant increments in swimming speed in the second waterway, and that these increments in performance were dependent upon initial training with continuous relief (i.e., reinforcement) in the first goal tank. Extensions of the generality of the frustration effect are discussed. 相似文献
17.
Formally the new public management model of governance was introduced into British higher education with the passage of the
1988 Education Reform Act, which abolished the existing University Grants Committee (UGC) and instigated the funding councils.
This article explores the relationship between the state, the funding councils and the universities with respect to the contemporary
development of the English system of higher education. The analysis is based on an exploration of four key policy issues:
the quality assurance regime, the research assessment exercises, the widening participation agenda and the introduction of
student fees. The goal is to explore how the quasi-state organisations—in particular the Higher Education Funding Council
for England (HEFCE)—have mediated the relationship between the state and the universities. The evidence suggests that the
coupling of the state to the universities follows one of three tracks: compliance, resistance and seduction. The article explores
what factors determine why one relationship (or combination of relationships) prevails, and explains patterns of change over
time. The overall conclusion is that institutional interaction is very complex, and it is inaccurate—as is sometimes claimed—to
view the funding council as little more than a compliant channel of government policy. 相似文献
18.
Since the 1970s, using his world-systems analysis, Immanuel Wallerstein has developed a wide-ranging framework for the social
sciences, with potential applications for comparative educational research. In this paper we outline key aspects of Wallerstein’s
theorising, and then analyse the uptake, understandings, and applications of his analysis in the field of comparative and
international education, through a case study of the Comparative Education Review (CER) journal from 1980 to 2008. This paper examines how, and how widely, his analysis has been adopted and interpreted.
Our analysis highlights significant and—given the broader emphasis in comparative education on questions of education and
development—surprising absences in the application of this approach. We conclude by arguing for the use and development of
three critical features of his analysis in comparative work, as relevant and timely interventions in the field. 相似文献
19.
Roxana Moreno Alfred Valdez 《Educational technology research and development : ETR & D》2005,53(3):35-45
The cognitive load and learning effects of dual-code and interactivity—two multimedia methods intended to promote meaningful
learning—were examined. In Experiment 1, college students learned about the causal chain of events leading to the process
of lightning formation with a set of words and corresponding pictures (Group WP), pictures (Group P), or words (Group W).
Some students were presented with the organized causal chain of events to study, whereas others were given a self-organization
task. Consistent with a cognitive theory of multimedia learning, Condition WP was the highest in instructional efficiency
for retention and transfer. However, contrary to our predictions, having students organize the multimedia materials was detrimental
to transfer. Two follow-up experiments tested the hypotheses that the negative effects of interactivity were due to students'
lack of time control (Experiment 2) and the form of feedback (Experiment 3). The findings showed that interactivity was effective
when students were asked to evaluate their answers before receiving corrective feedback from the system.
This research was supported by the CAREER 0238385 grant from the National Science Foundation. Any opinions, findings, and
conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views
of the National Science Foundation. Casey Frechette and Paul Gibson created the multimedia materials used in these studies. 相似文献
20.
The purpose of this study was to explore how users interact and learn during a computer-based simulation given graphical and
textual forms of feedback. In two experiments, university students interacted with a simple simulation that modeled the relationship
between acceleration and velocity. Subjects interacted with the computer simulation using a discovery-based approach: no formal
instruction on the science concepts was presented. Subjects had control over the acceleration of a simple screen object—a
ball—in a game-like context. Three simulation conditions were studied, each differing on how feedback of the ball's speed,
direction, and position was represented: graphical feedback, textual feedback, and graphical plus textual feedback. Results
showed that subjects learned more tacit knowledge when provided with animated graphical feedback than with textual feedback,
although gains in explicit understanding of these science principles did not depend on the way the feedback was represented.
Patterns of interactivity and frustration are also discussed.
Reiber says, “I thank Mack Smith and Faris Spahi for their help with various parts of this research.” 相似文献