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71.
Valeria V. González Alejandro Macías Armando Machado Marco Vasconcelos 《Journal of the experimental analysis of behavior》2020,113(3):591-608
When given a choice between two alternatives, each offering food after the same delay with different but signaled probabilities, pigeons often prefer the low probability alternative. This preference is surprising because pigeons fail to maximize the rate of food intake; they exhibit a suboptimal preference. We advance a new explanation, the Δ–∑ hypothesis, in which the difference in probability of reinforcement within terminal links (Δ) and the overall reinforcement probability rate of each alternative (∑) are the key variables responsible for such suboptimal preference. We tested the Δ–∑ hypothesis in two experiments. In Experiment 1, we manipulated the Δs while maintaining constant all other parameters of the task, in particular the ∑s. We predicted a preference for the alternative with the larger Δ. In Experiment 2, we examined the effect of the overall reinforcement probabilities, the ∑s, while maintaining constant all other parameters of the task, in particular the Δs. We predicted a preference for the larger ∑. The results of both experiments support the Δ–∑ hypothesis. 相似文献
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Catarina Soares Cristina Santos Armando Machado Marco Vasconcelos 《Journal of the experimental analysis of behavior》2020,114(3):337-353
Our goal was to assess the role of timing in pigeons' performance in the midsession reversal task. In discrete-trial sessions, pigeons learned to discriminate between 2 stimuli, S1 and S2. Choices of S1 were reinforced only in the first half of the session and choices of S2 were reinforced only in the second half. Typically, pigeons choose S2 before the contingency reverses (anticipatory errors) and S1 after (perseverative errors), suggesting that they time the interval from the beginning of the session to the contingency reversal. To test this hypothesis, we exposed pigeons to a midsession reversal task and, depending on the group, either increased or decreased the ITI duration. We then contrasted the pigeons' performance with the predictions of the Learning-to-Time (LeT) model: In both conditions, preference was expected to reverse at the same time as in the previous sessions. When the ITI was doubled, pigeons' preference reversal occurred at half the trial number but at the same time as in the previous sessions. When the ITI was halved, pigeons' preference reversal occurred at a later trial but at an earlier time than in the previous sessions. Hence, pigeons' performance was only partially consistent with the predictions of LeT, suggesting that besides timing, other sources of control, such as the outcome of previous trials, seem to influence choice. 相似文献
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The impact of training related to the Don't Ask, Don't Tell, Don't Pursue policy on training outcomes of military personnel was examined with data from the Department of Defense Inspector General's Don't Ask, Don't Tell, Don't Pursue Policy Survey of military personnel (N = 71,570). We hypothesized that training related to the Don't Ask, Don't Tell, Don't Pursue policy would impact participant's reactions, learning and cognitive outcomes, and behavioral and organizational outcomes. Results indicate that individuals who reported having received training on the homosexual conduct policy perceived the policy to be more effective at preventing/reducing harassment; were more likely to feel free to report harassment complaints; reported greater levels of understating and were more knowledgeable of the policy; reported higher levels of intolerance of harassment; and reported that more actions had been take at their installation/ship to reduce and prevent harassment than individuals who had not received any training. Although the pattern of results was statistically significant, the magnitude of these effects were small (η 2 = .001–.109). These findings highlight the continuing need to expand current efforts to reduce and curtail harassment based on perceived sexual orientation. 相似文献
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Several independent lines of research in neurobiology seem to support the phenomenologically-grounded view of the dreaming brain/mind as a useful model for psychosis. Hallucinatory phenomena and thought disorders found in psychosis share several peculiarities with dreaming, where internally generated, vivid sensorimotor imagery along with often heightened and incongruous emotion are paired with a decrease in ego functions which ultimately leads to a severe impairment in reality testing. Contemporary conceptualizations of severe mental disorders view psychosis as one psychopathological dimension that may be found across several diagnostic categories. Some experimental data have shown cognitive bizarreness to be equally elevated in dreams and in the waking cognition of acutely psychotic subjects and in patients treated with pro-dopaminergic drugs, independent of the underlying disorder. Further studies into the neurofunctional underpinnings of both conditions will help to clarify the use and validity of this model. 相似文献
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In the present study we extended errorless learning to a conditional temporal discrimination. Pigeons' responses to a left-red key after a 2-s sample and to a right-green key after a 10-s sample were reinforced. There were two groups: One learned the discrimination through trial and error and the other through an errorless learning procedure. Then, both groups were presented with three types of tests. First, they were exposed to intermediate durations between 2 s and 10 s, and given a choice between both keys (stimulus generalization test). Second, a delay from 1 s to 16 s was included between the offset of the sample and the onset of the choice keys (delay test). Finally, pigeons learned a new discrimination in which the stimuli were switched (reversal test). Results showed that pigeons from the Errorless group made significantly fewer errors than those in the Trial-and-Error group. Both groups performed similarly during the stimulus generalization test and the reversal test, but results of the delay test suggested that, on long stimulus trials, responding in the errorless training group was less disrupted by delays. 相似文献
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The impact of dermatological diseases on the quality of life is relatively well established, although some results do not support this relationship. Whereas a few studies indicate a decrease in various indicators of quality of life in conditions of disease, in other studies, this effect has not been observed. These differences can be explained by the use of different concepts of quality of life and/or the comparison of different severity levels of the diseases. The purpose of this paper is to analyze the impact of low-level expression dermatological diseases on various concepts of quality of life. Two hundred-ninety-nine participants completed a questionnaire about symptoms, psychological and psychosocial impact, and general and specific satisfaction. Results show that minor dermatological diseases affect health-related quality of life, but not quality of life considered as well-being. 相似文献
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