Expression of a taste aversion conditioned with an odor-taste compound: Overshadowing is relatively weak in weanlings and decreases over a retention interval in adults     

Philipp J. Kraemer  Nancy A. Lariviere  Norman E. Spear 《Learning & behavior》1988,16(2):164-168

Adult rats were injected with lithium chloride (LiCl) after consumption of a novel flavor (chocolate milk) that either was or was not presented together with a novel ambient odor (banana) as a compound conditioned stimulus (CS). In Experiment 1, the adults’ consumption of the flavor 24 h after conditioning was compared with that of weanling rats given the same conditioning treatment on Postnatal Day 21. The results confirmed previous indications that the reduction in aversion observed for adults conditioned with the compound CS (overshadowing) was weak or nonexistent in weanlings. After a longer retention interval (21 days), there was no evidence of overshadowing in adults despite maintained retention of the basic conditioned aversion. In Experiment 2 this decrease in overshadowing after a long retention interval was replicated with adult animals and extended to a different method of testing. The form of the effect was the same as in Experiment 1: The decrease in overshadowing occurred over the retention interval without loss in retention of the basic taste aversion; the decrease in overshadowing was a consequence of anincrease in the flavor aversion displayed by animals conditioned with the compound CS. The impaired flavor aversion (i.e., the overshadowing) observed shortly after conditioning apparently was due to factors associated with memory retrieval, rather than to reduced attentional or associative strength.  相似文献   

Migration,Knowledge Transfer,and the Emergence of Australian Post-War Skiing: The Story of Charles William Anton     

Philipp Strobl 《国际体育史杂志》2016,33(16):2006-2025

Skiing underwent substantial changes during the post-war years when the sport turned into a multi-billion dollar industry and a leisure activity for the masses. Despite its global nature and popularity, skiing in academic writing has not gained much recognition. This paper explores the role of knowledge transfer during the pioneering phase of post-war skiing in Australia. It describes the life of Charles William Anton, an Austrian refugee from the Anschluss who migrated to Sydney and subsequently became one of the founding fathers of Australian post-war skiing. The following pages show the multi-layered nature of skiing as a global sport by exemplifying how ideas spread from pre-war Europe to post-war Australia. The paper will also provide a case study about refugee knowledge transfer and the ‘productive process of absorption, adoption or rejection of knowledge’ that takes place once an idea has been introduced into a new environment.  相似文献   

The effect of nonreinforced stimulus exposure on the strength of a conditioned taste aversion as a function of retention interval: Do latent inhibition and extinction involve a shared process?     

Philipp J. Kraemer  Norman E. Spear 《Learning & behavior》1992,20(1):1-7

Two experiments examined the effects of nonreinforced flavor exposure on the strength of a conditioned taste aversion. Rats were conditioned by pairing maple flavor with LiC1. Prior to or subsequent to this pairing, some animals received nonreinforced exposure to either maple or saccharin. In separate subjects, preference for maple was tested 1 or 21 days after the last training episode. In the first experiment, the nonreinforced stimulus exposure occurred before conditioning (latent inhibition, or LI, procedure); in the second experiment, the nonreinforced exposure occurred after conditioning (extinction, or EXT, training). In both experiments, nonreinforced exposure to maple or saccharin reduced the magnitude of a conditioned maple aversion when testing occurred soon after conditioning. When testing was delayed, however, the attenuation due to nonreinforced saccharin exposure dissipated, both with the LI procedure and with EXT. In contrast, the nonreinforced exposure to maple was found to attenuate conditioned reactions at both short and long retention intervals. The release from generalized LI and spontaneous recovery following generalized EXT training are discussed in terms of retrieval processing. The possibility that the same mechanism may underlie LI and EXT is considered.  相似文献   

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   

Immersive virtual reality or auditory text first? Effects of adequate sequencing and prompting on learning outcome     

Andrea Vogt  Franziska Babel  Philipp Hock  Martin Baumann  Tina Seufert 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(5):2058-2076

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Retest effects in matrix test performance: Differential impact of predictors at different hierarchy levels in an educational setting     

Philipp Alexander Freund  Heinz Holling 《Learning and individual differences》2011,21(5):597-601

If tests of cognitive ability are repeatedly taken, test scores rise. Such retest effects have been observed for a long time and for a variety of tasks. This study investigates retest effects on figural matrix items in an educational context. A short term effect is assumed for the direct retest administration in the same test session, and a long term effect is assumed for a retest interval of six months. Using multilevel modeling, we analyze if the magnitude of these effects is not only influenced by individual variation, but also by the cluster structure of students grouped within classrooms. We also investigate if the use of identical versus parallel tests has an impact on the size of the retest effects. Our main results show a negligible short term retest effect, but a large long term retest effect. Using parallel tests does not contribute to understanding individual differences in retest effects. The variation in retest effects is larger between classrooms than between students. Reasoning ability, as measured with a different test, and school grades significantly influences retest effects at the individual level, but at the classroom level, only reasoning ability is a significant predictor.  相似文献   

The Submaximal Lateral Shuffle Test: A reliability and sensitivity analysis     

Philipp Maurus  Michael J. Asmussen  Sasa Cigoja  Sandro R. Nigg  Benno M. Nigg 《Journal of sports sciences》2013,31(18):2066-2074

ABSTRACT

Lateral ankle stability and how it changes in different footwear has been investigated for years. Research, however, has shown a lack of reliability or sensitivity of available methodologies. This study aimed to evaluate the test-retest reliability and sensitivity of a novel lateral stability protocol, the Submaximal Lateral Shuffle Test (SLST). We recruited 11 and 40 participants to assess reliability and sensitivity of the SLST, respectively. Participants performed the SLST in footwear that differed in collar height and upper stiffness. ICC values showed good to excellent reliability in peak ankle angles and moments, ground reaction forces, impulses, stance time, and performance time. Significantly lower peak inversion and adduction angles and lower medio-lateral push off peak forces were found in the high cut shoes compared to the low cut shoes. The medio-lateral landing peak force showed lower forces in the high cut shoes. The smallest worthwhile change indicated meaningful differences in 70.0–82.5% of participants for inversion, adduction, medio-lateral landing peak, and push off peak forces. These results, however, were not systematic such that there was not a consistent direction of the difference for all participants. In conclusion, the SLST is a promising protocol to further investigate lateral stability in footwear.  相似文献   

Book reviews     

François‐Auguste de Montêquin  J Derek Latham  Philipp W Rosemann  G Rex Smith  Josep Puig  Peter Heine 《Al-Masaq: Islam & the Medieval Mediterranean》1991,4(1):59-83

Bazzana, André; Cressier, Patrice; and Guichard, Pierre. Les châteaux ruraux d'al‐Andalus. Histoire et archéologie des husūn du sud‐est de l'Espagne. Preface by Pierre Toubert (Série Archéologie, XI). Madrid: Publications de la Casa de Velázquez, 1988. 326pp; illustrations (plates, maps, tables); bibliography, index.

Tāha, CAbdulwāhid Dhanūn. The Muslim Conquest and Settlement of North Africa and Spain (Exeter Arabic and Islamic Series, 3). London: Routledge, 1989. xiv + 280pp; £49.50.

Leaman, Oliver. Averroes and his Philosophy Oxford: Clarendon Press, 1988. 204pp.; £25.

Mas^cūdî. The Meadows of Cold: the Abbasids. Ed. & tr. P. Lunde & C. Stone. London: Kegan Paul International, 1989. 469 pp., 2 maps; £30.

Sirat, Colette. La philosophie juive médiévale en terre d'Islam. Paris: Presses du CNRS, 1988. 278 pp.

Epalza, Míkel de and others. Baños Arabes en el país Valenciano. [Valencia], Generalitat Valenciana: Consellería de Cultura, Educado i Ciència, 1989.157 pp., plates, figures., maps (unnumbered).

Waines, David In a Caliph's Kitchen.Medieval Arabic Cooking for the Modern Gourmet. London: Riad el‐Rayyes Books, 1989. 112pp., many illustrations; £14.

Abed, Shukri B. Aristotelian Logic and the Arabic Language in Alfārābi. Albany: State University of New York Press, 1991. xxv+201pp., two appendices, bibliography, index.

Meyerson, Mark D. The Muslims of Valencia in the Age of Fernando and Isabel: Between Coexistence and Crusade. Berkeley: University of California Press, 1991. xi + 372 pp.

Zacour, Norman. Jews and Saracens in the Consilia of Oldradus de Ponte. Toronto: Pontifical Institute of Medieval Studies, 1990. x+144pp., index; paperback.  相似文献   

The relationship between technology, innovation, and firm performance—Empirical evidence from e-business in Europe     

Philipp Koellinger 《Research Policy》2008,37(8):1317-1328

This article analyzes the relationship between the usage of Internet-based technologies, different types of innovation, and performance at the firm level. Data for the empirical investigation originates from a sample of 7302 European enterprises. The empirical results show that Internet-based technologies were an important enabler of innovation in the year 2003. It was found that all studied types of innovation, including Internet-enabled and non-Internet-enabled product or process innovations, are positively associated with turnover and employment growth. Firms that rely on Internet-enabled innovations are at least as likely to grow as firms that rely on non-Internet-enabled innovations. Finally, it was found that innovative activity is not necessarily associated with higher profitability. Possible reasons for this and implications are discussed.  相似文献