The influence of cue type and configuration upon radial-maze performance in the rat     

Philipp J. Kraemer  Mary E. Gilbert  Nancy K. Innis 《Learning & behavior》1983,11(3):373-380

The influence of cue type and cue configuration on radial-maze performance in rats was examined in two experiments. In the first experiment, it was found that rats provided with both salient intramaze and extramaze cues acquired the task faster than rats given only one set of cues. No difference in acquisition was found between a group trained with intramaze cues alone and a group trained with extramaze cues alone. In a cue-preference test, it was found that groups that had been trained with extramaze cues, intramaze cues, or both sets of cues relied on extra-maze cues to avoid visited arms when given both types of cues concurrently. When all groups were transferred to intramaze-cue-alone trials, only the group that had been originally trained with extramaze cues alone showed any disruption. Also, during the second half of the intramaze-cue-alone trials, the arrangement of these cues was randomly changed on each trial. This disruption in cue configuration did not deleteriously affect performance in any of the three groups; all remained above chance performance, although the performance of the group originally trained with extramaze cues alone was inferior to that of the other two groups. In Experiment 2, groups of rats were trained on daily alternating trials under intramaze-cue-alone and extramaze-cue-alone conditions. For one group, the configuration of intramaze cues was altered randomly on each trial; the other group had intramaze cues always presented in the same configuration over trials. It was found that acquisition was more rapid on intramaze trials in the group given static configurations. Also, acquisition of the extramaze task was faster than the intramaze task in the group given variable intramaze cue configurations. No difference was found between the intramaze and extramaze conditions in the group given static intramaze cue configurations. These data suggest that a static cue configuration may influence radial maze performance, but is not a necessary condition for such performance.  相似文献   

Matching-to-sample performance by pigeons trained with visual-duration compound samples     

Philipp J. Kraemer  Karen L. Roper 《Learning & behavior》1992,20(1):33-40

Pigeons were trained on duration matching-to-sample in which each of four combinations of signal type (red or white light) and duration (2 or 10 see) was mapped onto a different choice stimulus. Probe trials in Experiments 1 and 2 involved a successive presentation of two duration samples. In each experiment, birds tended to summate two durations when the same signal was presented twice, but not when two different signals appeared. These results contrast with those reported by Spetch and Sinha (1989), who found a summation effect with both same-signal and different-signal compounds. In Experiment 3, pigeons chose among two alternatives which were both associated with the duration of the sample but of which only one was also associated with the signal type of the sample. Pigeons systematically chose the stimulus that matched both sample duration and signal type. The implications of these findings are discussed in terms of transfer of training and coding of event duration.  相似文献   

The molecular basis of resin behavior     

Elmer O. Kraemer 《Journal of The Franklin Institute》1940,230(3):405-410

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Recognition memory for lists of visual stimuli in monkeys and humans     

William A. Roberts  Philipp J. Kraemer 《Learning & behavior》1981,9(4):587-594

In Experiment 1, short-term memory for lists of visual stimuli was studied in four squirrel monkeys (Saimiri sciureus). A delayed-matching procedure was used in which a subject was presented with lists containing one, three, or six stimulus patterns, and memory for serial positions was probed by requiring the subject to choose between a list item and a nonlist item. The rate of item presentation was varied, as was the delay between the final item on a list and the retention test. In Experiment 2, the same procedures were used to compare recognition memory in four monkeys and four humans. Although differences in the levels and shapes of the serial-position curves appeared between species, both monkeys and humans showed primacy and recency effects. The presentation time of stimuli had a negligible effect on performance in both monkeys and humans, whereas delay significantly affected human retention but not monkey retention.  相似文献   

Entrepreneurship, Flexibility, and Policy Coordination: Taiwan's Computer Industry     

Kenneth L. Kraemer 《The Information Society》1996,12(3):215-249

In just 15 years, Taiwan has emerged as a leading producer of hardware for nearly every major computer vendor in the world, despite little previous experience in high technology industries. By 1995, Taiwan ranked fourth in the world in computer hardware production and exports through its strategy of being a 'fast follower.' Taiwan's success in the computer industry has been due to a coordinated government strategy to support private entrepreneurship by a large number of small, flexible, innovative companies. Taiwan's computer companies have responded rapidly and effectively to continuing changes in the international market and avoided many of the problems encountered by their counterparts in Japan and South Korea in recent years. They have done so by emphasizing close supplier relationships with multinational computer companies all over the world as a means of promoting exports and keeping apprised of market conditions. They continue to show great adaptability as Taiwan's computer industry moves toward diversification both upstream and downstream, full-service OEM (original equipment manufacturing) for multinationals, and industry consolidation for scale economies. The government has closely complemented the efforts of industry by carrying out research and development and transferring technology to the private sector, by conducting market intelligence for private sector use, and by providing engineering and technical manpower. As a result, Taiwan is probably Asia's best positioned country for continued success in the global computer industry.  相似文献