Continued effects of context reinstatement in recognition

The context reinstatement effect refers to the enhanced memory performance found when the context information paired with a target item at study is re-­‐presented at test. Here we investigated the consequences of the way context information is processed in such a setting that gives rise to its beneficial effect on item recognition memory. Specifically, we assessed whether reinstating context in a recognition test facilitates subsequent memory for this context beyond facilitation conferred by presentation of the same context with a different study item. Reinstating study context at test led to better accuracy in 2-­‐alternative forced choice recognition for target faces than did re-­‐pairing those faces with another context encountered during the study phase. The advantage for reinstated over re-­‐paired conditions occurred for both within (Experiment 1) and between subjects (Experiment 2) manipulations. Critically, in a subsequent recognition test for the contexts themselves, contexts serving previously in the reinstated condition were recognized better than contexts serving previously in the re-­‐paired context condition. This constitutes the first demonstration of continuous effects of context reinstatement for memory for context

Metamemory in a familiar place: the effects of environmental context on feeling of knowing

Feeling-of-knowing (FOK) judgments are judgments of future recognizability of currently inaccessible information. They are known to depend both on the access to partial information about a target of retrieval and on the familiarity of the cue that is used as a memory probe. In the present study we assessed whether FOK judgments could also be shaped by incidental environmental context in which these judgments are made. To this end, we investigated 2 phenomena previously documented in studies on recognition memory—a context familiarity effect and a context reinstatement effect—in the procedure used to investigate FOK judgments. In 2 experiments, we found that FOK judgments increase in the presence of a familiar environmental context. The results of both experiments further revealed still higher FOK judgments when made in the presence of environmental context matching the encoding context of both cue and its associated target. The effect of context familiarity on FOK judgment was paralleled by an effect on the latencies of an unsuccessful memory search, but the effect of context reinstatement was not. Importantly, the elevated feeling of knowing in reinstated and familiar contexts was not accompanied by an increase in the accuracy of those judgments. Together, these results demonstrate that metacognitive processes are shaped by the overall volume of memory information accessed at retrieval, independently of whether this memory information is related to a cue, a target, or a context in which remembering takes place

Are Electrons Oscillating Photons, Oscillating “Vacuum," or Something Else? The 2015 Panel Discussion: An Unprecedented Engineering Opportunity: A Dynamical Linear Theory of Energy as Light and Matter

Platform: What physical attributes separate EM waves, of the enormous band of radio to visible to x-ray, from the high energy narrow band of gamma-ray? From radio to visible to x-ray, telescopes are designed based upon the optical imaging theory; which is an extension of the Huygens-Fresnel diffraction integral. Do we understand the physical properties of gamma rays that defy us to manipulate them similarly? One demonstrated unique property of gamma rays is that they can be converted to elementary particles (electron and positron pair); or a particle-antiparticle pair can be converted into gamma rays. Thus, EM waves and elementary particles, being inter-convertible; we cannot expect to understand the deeper nature of light without succeeding to find structural inter-relationship between photons and particles. This topic is directly relevant to develop a deeper understanding of the nature of light; which will, in turn, help our engineers to invent better optical instruments

Impact of Cleaning Frequency on Nitrogen Balance in Open Feedlot Pens

Pen cleaning frequency of feedlot pens was evaluated during the summer of 2001 and 2002. Dry matter, organic matter and nitrogen recoveries were evaluated on a per head basis. Cleaning pens monthly compared to cleaning at the end of the feeding period resulted in significantly more DM, OM and N recovered. Cleaning pens every month increased N removal by 7.0 lb per steer (49.9% increase) above manure N removed at the end of the feeding period

Review: The Fantasy of the Middle Ages: An Epic Journey through Imaginary Medieval Worlds

Review of The Fantasy of the Middle Ages: An Epic Journey through Imaginary Medieval Worlds by Larisa Grollemond and Bryan C. Keene. J. Paul Getty Museum, June 2022. 144 p. ill. ISBN 978-1-60606-758-1 (h/c), $29.95. Reviewed November 2022 by Stephanie B. Fletcher, Head of Discovery, Metadata, and Technical Services, Illinois Institute of Technology, [email protected]

Review: Renaissance Secrets: A Lifetime Working with Wall Paintings by Michelangelo, Raphael, and Others at the Vatican

Review of Renaissance Secrets: A Lifetime Working with Wall Paintings by Michelangelo, Raphael, and Others at the Vatican by Maurizio De Luca and Jason Cardone. Getty Conservation Institute, February 2023. 140 p. ill. ISBN 978-1-60606-799-4 (pbk.), $35.00. https://shop.getty.edu/products/renaissance-secrets-a-lifetime-working-with-wall-paintings-by-michelangelo-raphael-and-others-at-the-vatican-978-1606067994. Reviewed March 2023 by Stephanie B. Fletcher, Head of Discovery, Metadata, and Technical Services, Illinois Institute of Technology, [email protected]

Changing the Surgical Residency: A Mixed-Methods Study of Residents’ and Faculty Experiences One Year After Implementation

Objective: To evaluate a reformed surgical residency curriculum aimed at addressing emerging practice models, enhancing residents’ educational experience, and improving the quality/continuity of patient care by reducing the service size and enhancing attending-resident interactions. Methods: A mixed-methods study of the surgical training program following curriculum reform including: 1) focus group and individual qualitative interviews with residents, attendings, nurses, and advanced practice providers to explore stakeholder perspectives on curriculum reform, 2) time study of surgical resident activities, and 3) quantitative assessment of surgical case logs. Results: Qualitative interviews demonstrated disparate knowledge and attitudes regarding the goals of the curriculum with emergence of several themes during transcript analysis including: Goals of the Change, Learning and Educational Value, Communication, Teamwork, Service, and Quality of Life. Both positive aspects of curriculum reform (e.g., improved focus on resident education and balance between educational and service activities, communication, and opportunity for direct feedback and observation) and negative ones (e.g., lack of role clarity, insufficient workforce) were identified. Despite limitations, the time study revealed variability in resident activities by post-graduate year with more time spent on indirect patient care activities in the early years and more time in the OR and one-on-one with attendings later. Quantitative analysis of surgical case logs, previously published, showed no significant decrease in number of cases for residents by either training level or role. Conclusions: This single-institution mixed methods study suggests that a reformed surgical residency curriculum improved residents’ educational experiences and the balance between educational and service activities without affecting operative volume. Multiple modalities of assessment are essential to identify the various positive and negative aspects of an educational intervention

Enhanced gain and output power of a sealed‐off rf‐excited CO2 waveguide laser with gold‐plated electrodes

The small‐signal gain and the laser output power have been measured in a cw sealed‐off rf‐excited CO2waveguide laser for two different electrodematerials, gold‐plated copper and aluminum, at several excitation frequencies, gas pressures and mixture compositions. In the case of the gold‐plated electrodes an enhancement of the gain up to a factor of 2 and the output power up to a factor of 1.4 with time at a frequency of 190 MHz and 60 Torr of 1:1:5+5% (CO2:N2:He+Xe) mixture is observed. This is believed to be the result of the goldcatalytic activities which are favored by increased electrode temperatures and helium rich gas compositions

Long-term associative learning predicts verbal short-term memory performance

Studies using tests such as digit span and nonword repetition have implicated short-term memory across a range of developmental domains. Such tests ostensibly assess specialized processes for the short-term manipulation and maintenance of information that are often argued to enable long-term learning. However, there is considerable evidence for an influence of long-term linguistic learning on performance in short-term memory tasks that brings into question the role of a specialized short-term memory system separate from long-term knowledge. Using natural language corpora, we show experimentally and computationally that performance on three widely used measures of short-term memory (digit span, nonword repetition, and sentence recall) can be predicted from simple associative learning operating on the linguistic environment to which a typical child may have been exposed. The findings support the broad view that short-term verbal memory performance reflects the application of long-term language knowledge to the experimental setting

Spatial heterogeneity and peptide availability determine CTL killing efficiency in vivo

The rate at which a cytotoxic T lymphocyte (CTL) can survey for infected cells is a key ingredient of models of vertebrate immune responses to intracellular pathogens. Estimates have been obtained using in vivo cytotoxicity assays in which peptide-pulsed splenocytes are killed by CTL in the spleens of immunised mice. However the spleen is a heterogeneous environment and splenocytes comprise multiple cell types. Are some cell types intrinsically more susceptible to lysis than others? Quantitatively, what impacts are made by the spatial distribution of targets and effectors, and the level of peptide-MHC on the target cell surface? To address these questions we revisited the splenocyte killing assay, using CTL specific for an epitope of influenza virus. We found that at the cell population level T cell targets were killed more rapidly than B cells. Using modeling, quantitative imaging and in vitro killing assays we conclude that this difference in vivo likely reflects different migratory patterns of targets within the spleen and a heterogeneous distribution of CTL, with no detectable difference in the intrinsic susceptibilities of the two populations to lysis. Modeling of the stages involved in the detection and killing of peptide-pulsed targets in vitro revealed that peptide dose influenced the ability of CTL to form conjugates with targets but had no detectable effect on the probability that conjugation resulted in lysis, and that T cell targets took longer to lyse than B cells. We also infer that incomplete killing in vivo of cells pulsed with low doses of peptide may be due to a combination of heterogeneity in peptide uptake and the dissociation, but not internalisation, of peptide-MHC complexes. Our analyses demonstrate how population-averaged parameters in models of immune responses can be dissected to account for both spatial and cellular heterogeneity