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排序方式: 共有216条查询结果,搜索用时 31 毫秒
21.
Mazur JE 《Journal of the experimental analysis of behavior》2006,86(2):211-222
Pigeons responded on concurrent-chains schedules with equal variable-interval schedules as initial links. One terminal link delivered a single reinforcer after a fixed delay, and the other terminal link delivered either three or five reinforcers, each preceded by a fixed delay. Some conditions included a postreinforcer delay after the single reinforcer to equate the total durations of the two terminal links, but other conditions did not include such a postreinforcer delay. With short initial links, preference for the single-reinforcer alternative decreased when a postreinforcer delay was present, but with long initial links, the postreinforcer delays had no significant effect on preference. In conditions with a postreinforcer delay, preference for the single-reinforcer alternative frequently switched from above 50% to below 50% as the initial links were lengthened. This pattern of results was consistent with delay-reduction theory (Squires & Fantino, 1971), but not with the contextual-choice model (Grace, 1994) or the hyperbolic value-added model (Mazur, 2001) as they have usually been applied. However, the hyperbolic value-added model could account for the results if its calculations were expanded to include reinforcers delivered in later terminal links. The implications of these findings for models of concurrent-chains performance are discussed. 相似文献
22.
Dariusz Zapała Emilia Zabielska-Mendyk Andrzej Cudo Agnieszka Krzysztofiak Paweł Augustynowicz Piotr Francuz 《Journal of motor behavior》2013,45(4):312-318
The authors’ aim was to examine whether short-term kinesthetic training affects the level of sensorimotor rhythm (SMR) in different frequency band: alpha (8–12 Hz), lower beta (12.5–16 Hz) and beta (16.5–20 Hz) during the execution of a motor imagery task of closing and opening the right and the left hand by experts (jugglers, practicing similar exercises on an everyday basis) and amateurs (individuals not practicing any sports). It was found that the performance of short kinesthetic training increases the power of alpha rhythm when executing imagery tasks only in the group of amateurs. Therefore, kinesthetic training may be successfully used as a method increasing the vividness of motor imagery, for example, in tasks involving the control of brain–computer interfaces based on SMR. 相似文献
23.
Piotr Styrkowiec Remigiusz Szczepanowski 《Advances in cognitive psychology / University of Finance and Management in Warsaw》2013,9(4):202-215
The analysis of reaction time (RT) distributions has become a recognized standard
in studies on the stimulus response correspondence (SRC) effect as it allows
exploring how this effect changes as a function of response speed. In this
study, we compared the spatial SRC effect (the classic Simon effect) with the
motion SRC effect using RT distribution analysis. Four experiments were
conducted, in which we manipulated factors of space position and motion for
stimulus and response, in order to obtain a clear distinction between positional
SRC and motion SRC. Results showed that these two types of SRC effects differ in
their RT distribution functions as the space positional SRC effect showed a
decreasing function, while the motion SRC showed an increasing function. This
suggests that different types of codes underlie these two SRC effects. Potential
mechanisms and processes are discussed. 相似文献
24.
Piotr Rajski 《Journal of religion and health》2003,42(3):181-190
In this paper the author shares some of his experiences of using silence in therapy. He presents one of the modes of practicing silence, namely the meditation technique known as Contemplative Prayer, and shows advantages of using this technique in the process of self-purification and self-balancing of the therapist. The author stipulates that silence is a royal way to discovering God. Finding this divine particle within oneself and client changes the whole outlook of therapy. The therapist is no longer alone with the client, but God becomes an active participant in the therapeutic process through His love for both therapist and client. 相似文献
25.
26.
Robert F. Belli Piotr Winkielman J. Don Read Norbert Schwarz Steven Jay Lynn 《Psychonomic bulletin & review》1998,5(2):318-323
Dissociative disorders that are believed to develop from childhood sexual abuse are often considered to include amnesia for childhood events, particularly the events that involve the abuse itself. One unresolved issue is the extent to which memory recovery attempts can contribute to claims of having amnestic symptoms. Experiments with undergraduate subjects reveal that requiring more reports of childhood events will increase judgments of having poorer memory of one’s childhood. The results are consistent with the use of heuristics when one is reasoning under conditions of uncertainty, as experienced difficulty in remembering more experiences is attributed to the incompleteness of childhood memory. The findings challenge the validity of reports of childhood amnesia that follow memory recovery attempts. 相似文献
27.
Choice with delayed and probabilistic reinforcers: effects of prereinforcer and postreinforcer stimuli.
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J E Mazur 《Journal of the experimental analysis of behavior》1998,70(3):253-265
In Experiment 1, pigeons' pecks on a green key led to a 5-s delay with green houselights, and then food was delivered on 20% (or, in other conditions, 50%) of the trials. Pecks on a red key led to an adjusting delay with red houselights, and then food was delivered on every trial. The adjusting delay was used to estimate indifference points: delays at which the two alternatives were chosen about equally often. Varying the presence or absence of green houselights during the delays that preceded possible food deliveries had large effects on choice. In contrast, varying the presence of the green or red houselights in the intertrial intervals had no effects on choice. In Experiment 2, pecks on the green key led to delays of either 5 s or 30 s with green houselights, and then food was delivered on 20% of the trials. Varying the duration of the green houselights on nonreinforced trials had no effect on choice. The results suggest that the green houselights served as a conditioned reinforcer at some times but not at others, depending on whether or not there was a possibility that a primary reinforcer might be delivered. Given this interpretation of what constitutes a conditioned reinforcer, most of the results were consistent with the view that the strength of a conditioned reinforcer is inversely related to its duration. 相似文献
28.
Todd L. McKerchar James E. Mazur 《Journal of the experimental analysis of behavior》2019,111(3):387-404
Four hundred and fifty participants were recruited from Amazon Mechanical Turk across 3 experiments to test the predictions of a hyperbolic discounting equation in accounting for human choices involving variable delays or multiple rewards (Mazur, 1984, 1986). In Experiment 1, participants made hypothetical choices between 2 monetary alternatives, 1 consisting of a fixed delay and another consisting of 2 delays of equal probability (i.e., a variable‐delay procedure). In Experiment 2, participants made hypothetical monetary choices between a single, immediate reward and 2 rewards, 1 immediate and 1 delayed (i.e., a double‐reward procedure). Experiment 3 also used a double‐reward procedure, but with 2 delayed rewards. Participants in all 3 experiments also completed a standard delay‐discounting task. Finally, 3 reward amounts were tested in each type of task ($100, $1000, and $5000). In the double‐reward conditions (Experiments 2 and 3), the results were in good qualitative and quantitative agreement with Mazur's model (1984, 1986). In contrast, when participants made choices involving variable delays (Experiment 1), there was relatively poor qualitative and quantitative agreement with this model. These results, along with our previous findings, suggest the structure of questions in hypothetical tasks with humans can be a strong determinant of the choice pattern. 相似文献
29.
30.
Verleger R Zurawska Vel Grajewska B Jaśkowski P 《Advances in cognitive psychology / University of Finance and Management in Warsaw》2012,8(1):19-28
A most sensitive and specific electrophysiological indicator of selective processing of visual stimuli is the N2pc component. N2pc is a negative EEG potential peaking 250 ms after stimulus onset, recorded from posterior sites contralateral to relevant stimuli. Additional deflections preceding or following N2pc have been obtained in previous studies, possibly produced by specific stimulus features or specific prime-target sequences. To clarify the entire time-course of the contralateral- ipsilateral (C-I) difference recorded from the scalp above visual cortex in response to left-right pairs of targets and distracters, C-I differences were here compared between two types of stimuli and between stimuli that were or were not preceded by masked neutral primes. The C-I difference waveform consisted of several peaks, termed here P1pc (60-100 ms after target onset), N1pc (120-160 ms), N2pc (220-280 ms), and N3pc (360-400 ms). Being markedly enhanced when stimuli were preceded by the neutral primes, P1pc may indicate a response to stimulus change. Also, when stimuli were primed, N2pc reached its peak earlier, thereby tending to merge with N1pc. N3pc seemed to increase when target discrimination was difficult. N1pc, N2pc, and N3pc appear as three periods of one process. N3pc probably corresponds to L400 or SPCN as described in other studies. These observations suggest that the neurophysiological basis of stimulus-driven focusing of attention on target stimuli is a process that lasts for hundreds of milliseconds, with the relevant hemisphere being activated in an oscillating manner as long as required by the task. 相似文献