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271.
Autocontingencies: Suppressive and accelerative effects of pairs of shocks superimposed on a positively reinforced operant baseline 下载免费PDF全文
Previous research has shown that unsignaled shock may accelerate positively reinforced operant responding if each shock signals a subsequent shock-free period. In order to explore the boundary conditions of this effect, two experiments were performed. In Experiment 1, pairs of unsignaled shocks separated by 15, 30, 60, or 120 seconds resulted in suppressed responding during the briefest intershock interval, and in accelerated responding during the longer intervals. When the second shock in each pair signaled a shock-free period of at least 3 minutes, accelerated responding also followed offset of the second shock in all but the 30-second condition. In Experiment 2, the addition of a conditioned stimulus prior to each pair of shocks restored baseline responding, and eliminated accelerative control following the second shock only under the briefest inter-shock interval. The results are discussed in terms of the similarity between autocontingencies (shock/no-shock relations; Davis, Memmott, & Hurwitz, 1975) and recent modifications of the feature-positive procedure (e.g., Reberg & Memmott, 1979), which stress stimulus control by shock/no-shock relationships. 相似文献
272.
An interresponse-time analysis of responding maintained by schedules of response-produced electric shock 总被引:1,自引:1,他引:0 下载免费PDF全文
The present study investigated ratio contingencies to evaluate factors that may determine the maintenance of responding when electric shock is the consequent event. Initially, squirrel monkeys (Saimiri sciureus) were exposed to a continuous-avoidance schedule to initiate bar pressing. Subsequently, a multiple random-interval variable-ratio yoked schedule of response-produced shock was used to maintain and to compare interval and ratio performance. A microcomputer recorded and stored the number of responses and interresponse times occurring between successive shock presentations during a given random-interval component, and these numbers determined the ratio requirements during the subsequent ratio component. Responding was maintained for more than 80 sessions in two of three monkeys under the multiple schedule with the ratio yoked to the interval component. Responding during the ratio component persisted in only one monkey, however, when the components were no longer yoked. An analysis of the interresponse times immediately preceding shock under the multiple yoked schedule revealed that the terminal interresponse times were longer under the interval schedule than under the ratio contingency. The interresponse-time analysis indicated that differential interresponse-time relationships may be major determinants of the maintenance of behavior controlled by schedules of electric-shock presentation. 相似文献
273.
Schedules of food postponement: II. Maintenance of behavior by food postponement and effects of the schedule parameter 下载免费PDF全文
In Experiment I, food-deprived, feeder-trained squirrel monkeys pressed a lever to postpone brief electric shocks (Response-Shock=Shock-Shock interval=30 seconds). Forty-one three-hour sessions of shock postponement were followed by 120 sessions of concurrent shock and food postponement. The shock schedule was unchanged and the food schedule was Response-food interval–20 seconds, Food-food interval 10 seconds. After concurrent shock and food postponement, the shock schedule was discontinued and 40 sessions of food postponement ensued, followed by 53 sessions of extinction. After extinction, food postponement was resumed for 11 sessions. Stable responding with low food rates was maintained under food-postponement after the concurrent schedule. Responding decreased to low levels under extinction and recovered immediately to previous levels when the food-postponement schedule was re-instated. In Experiment II, a parameter of the food-postponement schedule was studied sequentially. Using the same subjects, the Response-food–Food-food interval was manipulated from four seconds to 80 seconds with several orders of presentation. Relations of response rates and food rates to the parameter were similar to those seen under shock postponement. Exposure to very short postponement times (four seconds), resulting in very high food rates, decreased but did not abolish subsequent responding at longer postponement times. Results are discussed from the point of view that reinforcing functions of stimuli consequent on responding depend on a prior history of scheduled contact with those stimuli. 相似文献
274.
Professor Simon Archer 《Science and engineering ethics》1996,2(1):55-70
Creative accounting, which generally involves the preparation of financial statements with the intention of misleading readers
of those statements, is prima facie a form oflying, as defined by Bok.1 This paper starts by defining and illustrating creative accounting. It examines and rejects the arguments for considering
creative accounting, in spite of its deceptive intent, as not being a form of lying. It then examines the ethical issues raised
by creative accounting, in the light of the literature on the ethics of lying. This literature includes the evaluation of
various excuses and justifications for lying, and these are examined here in relation to creative accounting. It is concluded
that even in circumstances in which creative accounting would arguably serve a worthy purpose, that purpose would be at least
as well served by honest communication. 相似文献
275.
Lever attacking and pressing as a function of conditioning and extinguishing a lever-press avoidance response in rats 下载免费PDF全文
Six experimental rats were conditioned to press one of two available levers to avoid shock. The levers registered bites as well as presses. For four of these rats, shock was contingent on lever bites when a specified time period had elapsed after the previous shock. An extinction period, in which only periodic noncontingent shocks were presented, followed avoidance training. Six yoked-control rats received the same sequence of shocks as did the corresponding experimental rats in both the conditioning and extinction phases. All six experimental rats repeatedly bit the avoidance lever. Four bit it more than the nonavoidance lever during conditioning, and five bit it more during extinction. Five of the six experimental rats consistently bit the levers many more times during each session than did their respective control rats, suggesting that avoidance conditioning facilitated lever biting. Rates of lever biting and pressing by all of the experimental rats and by some of the control rats were highest immediately following shock throughout both phases. During later portions of the intervals following shock, characteristic effects of conditioning and extinction were observed. This finding suggests that extinction of avoidance behavior by unavoidable shock presentations can be demonstrated more readily when shock-elicited responding is extricated from the data. 相似文献
276.
Warmup in free-operant avoidance as a function of the response-shock = shock-shock interval 下载免费PDF全文
Hineline PN 《Journal of the experimental analysis of behavior》1978,30(3):281-291
Warmup effects, the repeated within-session transitions from ineffective to effective avoidance, were examined with rats on free-operant shock-delay procedures. The shock-shock and response-shock intervals were kept equal as they were varied. As measured by both response rates and shock rates, the magnitude of within-session change in performance was inversely related to the size of the manipulated intervals. The duration of warmup tended to decrease as the intervals were increased. This finding, that increased shock frequencies do not shorten the warmup, appears to be inconsistent with all interpretations of the warmup that have been offered to date. Late-session performances replicated general features of prior experiments, but differed with respect to details of secondary conclusions in previous reports. These differences may stem from the selection of especially proficient avoiders for previous experiments. 相似文献
277.
Responding under schedules combining response-dependent and response-independent shock delivery 下载免费PDF全文
Bacotti AV 《Journal of the experimental analysis of behavior》1978,29(2):267-272
Lever pressing of three squirrel monkeys with experience under continuous avoidance schedules was maintained by response-produced shock under a 5-minute variable-interval schedule. Responding decreased when half of the scheduled shocks were delivered independently of lever pressing and decreased further when all shocks were independent of lever pressing. Responding was lowest when all shocks were eliminated. When the proportion of response-dependent shocks increased, responding increased. This relation occurred even though the frequency and temporal distribution of shock delivery remained the same. Responding of two monkeys increased in a graded fashion as the frequency of shock was increased by arranging variable-time 5-minute, 2-minute, and 1-minute schedules jointly with the variable-interval 5-minute schedule. Thus, increasing the proportion of response-independent shocks decreased responding when the overall frequency of shocks stayed the same, but increased responding when the overall frequency of shock delivery increased. 相似文献
278.
Behavior simultaneously maintained by both presentation and termination of noxious stimuli 总被引:3,自引:2,他引:1 下载免费PDF全文
Lever pressing by two squirrel monkeys was maintained under a 3-minute variable-interval schedule of response-produced electric-shock presentation. At the same time, responding on a second lever was maintained under a 3-minute fixed-interval schedule of termination of the shock-presentation schedule and shock-correlated stimuli. Under the termination schedule, the first response after a 3-minute period produced a 1-minute timeout, during which no events occurred and responding had no scheduled consequence. Relatively high and constant rates of responding were maintained on the lever where responding produced shock. Lower rates and positively accelerated patterns of responding occurred on the lever where responding terminated the shock schedule. Thus, responding was simultaneously maintained by presentation of an event and by termination of a stimulus associated with that event. Rates and patterns of responding on each lever were reversed when the schedules arranged on each lever were reversed on two occasions. When shock intensity was increased from 0 to 10 mA, responding maintained both by presentation of shock and by termination of the shock schedule increased, but responding maintained by shock presentation increased to a greater extent. Positive and negative reinforcement, usually regarded as separate behavioral processes involving different events, can coexist when behavior is controlled by different contingencies involving the same event. 相似文献
279.
Zabriskie B 《The Journal of analytical psychology》2000,45(3):427-447
The archaic story of the Thracian musician Orpheus and his bride Eurydice is heard first as an ancient myth of marriage and death, wedding and separation. The mixture of expectation and dread in its sentiments is sounded still today in the contemporary wedding songs and funeral laments of the Mediterranean and the Balkans. Similar sequences of engagement and withdrawal, ascent and descent, change and metamorphosis are found in the adventures and vicissitudes of other mythic figures. Its premise of the soul's transmigration and its promise of psychic transformation inspired the religious ruminations and philosophic speculation of many centuries. The shifting keys in the songs of Orpheus and the cries of Eurydice score the shocking emotions of epiphanal moments, the creative 'agon', and a depth psychological passage. With its crescendos and denouements, the Orpheus/Eurydice phenomenon suggests the range of experience as one both engages reality and reaches toward meaning. 相似文献
280.
This study explored the relationship between social media (SM) use and creativity. The data collected from 407 participants included indicators such as time spent using SM, frequency of SM use, purposes for using SM, and the nature of SM use. The data involved two aspects of creativity: ideational behavior and creative activity and accomplishment. Correlational analyses indicate that SM use is positively related to both creativity measures. Overall, the active use of SM (e.g., sending a post) is more related to creativity than the passive use (e.g., reading others’ posts); and the link between creativity and SM use is more evident for certain platforms (i.e., Twitter) than others (e.g., Instagram). Ideational behavior and creative activity were also found to be higher among those who use SM primarily for expressing their ideas and opinions, gleaning information on topics to discuss and self‐education and learning compared with those who use it primarily for entertainment or relaxation. None of the creativity measures used was related to extraversion and excessive use of SM. Our findings indicate that SM is not necessarily a negative factor for creativity; it may even be a useful platform to support new ideas and projects. 相似文献