Articulatory loop explanations of memory span and pronunciation rate correspondences: a cautionary note

In recent years, a number of memory span findings have been attributed to the operation of an articulatory loop (Baddeley & Hitch, 1974). These attributions have been made on the basis of finding a correspondence between span differences and pronunciation rate differences. This experiment explored articulatory loop explanations for two material effects in memory span: the word-frequency effect (span for high-frequency words is larger than span for low-frequency words) and the word-class effect (span for function words is smaller than span for either nouns or adjectives). The results indicate that it is possible to obtain span differences without finding corresponding pronunciation rate differences. Moreover, span differences were as pronounced under articulatory suppression conditions as they were under rehearsal conditions. Both of these results limit the generality of articulatory loop explanations of memory span

Creating proactive interference in immediate recall: building a dog from a dart, a mop and a fig

[Abstract]: Phonemic codes are accorded a privileged role in most current models of immediate serial recall, although their effects are apparent in short-term proactive interference (PI) effects as well. The current research looks at how assumptions concerning distributed representation and distributed storage involving both semantic and phonemic codes might be operationalized to produce PI in a short-term cued recall task. The four experiments reported here attempted to generate the phonemic characteristics of a non-rhyming, interfering foil from unrelated filler items in the same list. PI was observed when a rhyme of the foil was studied or when the three phonemes of the foil were distributed across three studied filler items. The results suggest that items in short-term memory are stored in terms of feature bundles and that all items are simultaneously available at retrieval

Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields

Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit an anomalous decrease in their surface impedance, Zs as a function of microwave field, Hrf. In zero dc field, Hrf-dependences of Rs and Xs for both the samples are uncorrelated, and only one of the quantities, Rs or Xs, displays anomalous behavior. Here, application of relatively weak (~5 mT) dc magnetic fields, Hdc can produce a correlated decrease of Rs(Hrf) and Xs(Hrf). The dependences of Zs on Hdc in both low and high microwave power regimes were found to be non-monotonic. The frequency dependence of Rs ~ fn, 1.7<n<2.5, remained the same upon the transition from low to high microwave power ranges. The consequences of the reported findings for microwave device applications are briefly discussedComment: 4 pages, 4 figures. Submitted to ASC'2000 Conference Proceeding

Effects of forage variations on young-of-year striped bass and other young predators in Cherokee Reservoir, Tennessee

Food habits and growth of young-of-year striped bass fingerlings stocked in 1981 and 1982 into Cherokee Reservoir, Tennessee, were examined. Food habits and growth of stocked Morone and Stizostedion hybrids and native white bass were also analyzed. Striped bass stocked in 1981 maintained relatively poor condition and grew slowly, reaching only 9.4 cm by December of their first year on a diet that consisted primarily of Chironomidae and Crustacea. Morone hybrids stocked the same year grew better than striped bass, reaching 24.7 cm by November on a diet that contained more shad. Striped bass fingerlings stocked in 1982 began consuming small shad almost immediately and continued to utilize shad throughout their first growing season. These fish maintained good condition and grew rapidly to 27.1 cm by October of their first year and 31.8 cm by March of the following spring. White bass demonstrated similar year class differences which suggested that environmental factors accounted for at least part of the difference between striped bass year classes. The more rapid growth of striped and white bass in 1982 was attributed to a ten-fold increase in threadfin shad abun-dance between 1981 and 1982 which was the result of recovery from a severe winter-kill in 1976-77. Earlier stocking dates and high water conditions in 1982 may also have contributed to more rapid growth of the 1982 year class of striped bass

A Tale of Two Impostors: SN2002kg and SN1954J in NGC 2403

We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12) and SN 2002kg(V37). For the famous object SN 1954J we combine four critical observations: its current SED, its Halpha emission line profile, the Ca II triplet in absorption in its red spectrum, and the brightness compared to its pre-event state. Together these strongly suggest that the survivor is now a hot supergiant with T ~ 20000 K, a dense wind, substantial circumstellar extinction, and a G-type supergiant companion. The hot star progenitor of V12's giant eruption was likely in the post-red supergiant stage and had already shed a lot of mass. V37 is a classical LBV/S Dor variable. Our photometry and spectra observed during and after its eruption show that its outburst was an apparent transit on the HR Diagram due to enhanced mass loss and the formation of a cooler, dense wind. V37 is an evolved hot supergiant at ~10^6 Lsun with a probable initial mass of 60 -80 Msun.Comment: To appear in the Astrophysical Journa

Category-length and category-strength effects using images of scenes

Global matching models have provided an important theoretical framework for recognition memory. Key predictions of this class of models are that (1) increasing the number of occurrences in a study list of some items affects the performance on other items (list-strength effect) and that (2) adding new items results in a deterioration of performance on the other items (list-length effect). Experimental confirmation of these predictions has been difficult, and the results have been inconsistent. A review of the existing literature, however, suggests that robust length and strength effects do occur when sufficiently similar hard-to-label items are used. In an effort to investigate this further, we had participants study lists containing one or more members of visual scene categories (bathrooms, beaches, etc.). Experiments 1 and 2 replicated and extended previous findings showing that the study of additional category members decreased accuracy, providing confirmation of the category-length effect. Experiment 3 showed that repeating some category members decreased the accuracy of nonrepeated members, providing evidence for a category-strength effect. Experiment 4 eliminated a potential challenge to these results. Taken together, these findings provide robust support for global matching models of recognition memory. The overall list lengths, the category sizes, and the number of repetitions used demonstrated that scene categories are well-suited to testing the fundamental assumptions of global matching models. These include (A) interference from memories for similar items and contexts, (B) nondestructive interference, and (C) that conjunctive information is made available through a matching operation