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Stephen F. Davis David A. Whiteside Judith A. Bramlett Sharon Hake Petersen 《Learning and motivation》1981,12(3):364-382
A series of five experiments was conducted to examine odor production and utilization under conditions of contrasting large and small reward. Using daily, eight-trial double-alternation sequences of reward (L)-nonreward (N) or small reward (S), i.e., LLNNLLNN and LLSSLLSS, appropriate patterning was shown only when an empty goalbox was initially encountered on N or S trials (Experiments 1–5). Manipulations designed to increase frustration, for example, preceding double-alternation training with a block of large-reward trials in Experiment 2, or increasing the L vs S ratio in Experiment 3, failed to yield patterning when small reward was presented at the start of the S-trial confinement period. Patterning was shown when small reward was presented at the end of the S-trial confinement (Experiments 4 and 5). Immediate vs delayed (30 sec) S or N trial goalbox removal failed to result in differences in patterning (Experiments 1 and 2). To distinguish odor production from odor use, subjects trained on an LLSSLLSS pattern preceded subjects trained on an LLNNLLNN pattern (Experiment 5). Because patterning failed to develop in the LLSSLLSS subjects and the first subject in the LLNNLLNN group, it was concluded that a discriminably different cue was not produced on S trials under the LLSSLLSS sequence when small reward was delivered at the beginning of the goalbox confinement period. Shifting small-reward delivery to the end of goalbox confinement resulted in the immediate display of patterning by the first LLNNLLNN subject, and the subsequent development of patterning by the LLSSLLSS subjects. 相似文献
64.
M J Owren S L Hopp J M Sinnott M R Petersen 《Journal of comparative psychology (Washington, D.C. : 1983)》1988,102(2):99-107
We investigated the absolute auditory sensitivities of three monkey species (Cercopithecus aethiops, C. neglectus, and Macaca fuscata) and humans (Homo sapiens). Results indicated that species-typical variation exists in these primates. Vervets, which have the smallest interaural distance of the species that we tested, exhibited the greatest high-frequency sensitivity. This result is consistent with Masterton, Heffner, and Ravizza's (1969) observations that head size and high-frequency acuity are inversely correlated in mammals. Vervets were also the most sensitive in the middle frequency range. Furthermore, we found that de Brazza's monkeys, though they produce a specialized, low-pitched boom call, did not show the enhanced low-frequency sensitivity that Brown and Waser (1984) showed for blue monkeys (C. mitis), a species with a similar sound. This discrepancy may be related to differences in the acoustics of the respective habitats of these animals or in the way their boom calls are used. The acuity of Japanese monkeys was found to closely resemble that of rhesus macaques (M. mulatta) that were tested in previous studies. Finally, humans tested in the same apparatus exhibited normative sensitivities. These subjects responded more readily to low frequencies than did the monkeys but rapidly became less sensitive in the high ranges. 相似文献
65.
The effect of variations in interreinforcement interval on the temporal and distributional relation between feeding and drinking was continuously monitored. Rats were housed continuously in an operant chamber in which water was freely available, but lever pressing was required to obtain food (45-mg pellets). Initially, pellets were delivered on a fixed-ratio 1 schedule of reinforcement, which was followed by testing on response-initiated fixed-interval 15-, 30-, and 60-second schedules. The total number of discrete, daily meals (a period in which several pellets were earned in succession) was slightly higher during the fixed-interval schedules than during the fixed-ratio 1, but there was no systematic effect of fixed-interval length on meal frequency. Total water consumption, in contrast, increased dramatically as the interval was lengthened: both subjects consumed two to three times as much water on the fixed-interval 60-second schedule as on the fixed-ratio 1. The increased water consumption was the result of an alteration in the distribution of drinking relative to eating. During the fixed-ratio 1 condition, drinking occurred infrequently following individual food pellets and represented the smallest percentage of total drinking; drinking occurred predominantly just before or after a meal. As the fixed interval was lengthened, however, the frequency of postpellet drinking gradually increased and eventually comprised the largest proportion of daily drinking. 相似文献
66.
Codori AM Waldeck T Petersen GM Miglioretti D Trimbath JD Tillery MA 《Journal of genetic counseling》2005,14(2):119-132
Genetic counseling may turn risk information into cancer prevention behavior by modifying health beliefs and cancer-related distress. We assessed the effect of genetic counseling on these factors in 101 adult first-degree-relatives of colorectal cancer patients from families with known or suspected hereditary nonpolyposis colorectal cancer. Before counseling and once afterward, subjects completed self-report measures of perceived lifetime risk and cancer-distress. Most persons overestimated their cancer risk, and higher perceived risk was associated with believing that colorectal cancer cannot be prevented. Individual perceived risk changed after counseling, although mean perceived risk was unchanged. After adjusting for baseline risk, older persons and those with higher estimated objective cancer risk had larger postcounseling decreases. Distress after counseling was positively correlated with baseline distress and anxiety symptoms, and inversely correlated with tolerance for ambiguity. The findings suggest counseling interventions that should increase the likelihood of screening and offer hypotheses for future research. 相似文献
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Alexander Bor Frederik Jørgensen Marie Fly Lindholt Michael Bang Petersen 《Political psychology》2023,44(2):257-279
The emergence of the novel coronavirus has put societies under tremendous pressure to instigate massive and rapid behavior change. Throughout history, an effective strategy to facilitate novel behaviors has been to morally condemn those who do not behave in an appropriate way. Accordingly, here, we investigate if complying with the advice of health authorities—for example, to physically distance or vaccinate—has emerged as a moralized issue during the COVID-19 pandemic. In Study 1, we rely on data (N = 94K) from quota-sampled rolling cross-sectional online surveys from eight countries (Denmark, Sweden, Germany, France, Italy, Hungary, the United Kingdom, and the United States). We find that large majorities find it justified to condemn those who do not keep a distance to others in public and around half of respondents blame ordinary citizens for the severity of the pandemic. Furthermore, we identify the most important predictors of condemnation to be behavior change and personal concern, while institutional trust and social distrust also play large but less consistent roles. Study 2 offers a registered replication of our findings on a representative sample of Britons (N = 1.5K). It shows that both moralization and condemnation of both vaccination and general compliance are best predicted by self-interested considerations. 相似文献
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Abstract— Positron emission tomography (PET) is a recently developed technology that can be used to create images of brain blood flow, which is related to brain activity. By acquiring images of brain blood flow during different task conditions, investigators can isolate activity changes related to specific types of information processing. Several examples demonstrate how regions involved in reading can be identified, and how the results are most interpretable when information from other disciplines is considered. 相似文献