Paving the Way for Success in High School and Beyond: The Importance of Preparing Middle School Students for the Transition to Ninth Grade

P/PV's GroundWork series summarizes available evidence on a variety of social policy topics, providing a firm foundation for future work.This second brief in the series presents an overview of issues surrounding the ninth grade transition: why it is so important; why many middle school students find it so difficult; traits related to a successful transition; and what schools can do to ease difficulties in the transition. Research indicates that students unprepared to handle the transition are more likely to disengage from school, which in turn may lead to dropping out -- and a host of related problems, thus perpetuating a cycle of poverty for disadvantaged, low-income youth

Strong converse exponents for a quantum channel discrimination problem and quantum-feedback-assisted communication

This paper studies the difficulty of discriminating between an arbitrary quantum channel and a "replacer" channel that discards its input and replaces it with a fixed state. We show that, in this particular setting, the most general adaptive discrimination strategies provide no asymptotic advantage over non-adaptive tensor-power strategies. This conclusion follows by proving a quantum Stein's lemma for this channel discrimination setting, showing that a constant bound on the Type I error leads to the Type II error decreasing to zero exponentially quickly at a rate determined by the maximum relative entropy registered between the channels. The strong converse part of the lemma states that any attempt to make the Type II error decay to zero at a rate faster than the channel relative entropy implies that the Type I error necessarily converges to one. We then refine this latter result by identifying the optimal strong converse exponent for this task. As a consequence of these results, we can establish a strong converse theorem for the quantum-feedback-assisted capacity of a channel, sharpening a result due to Bowen. Furthermore, our channel discrimination result demonstrates the asymptotic optimality of a non-adaptive tensor-power strategy in the setting of quantum illumination, as was used in prior work on the topic. The sandwiched Renyi relative entropy is a key tool in our analysis. Finally, by combining our results with recent results of Hayashi and Tomamichel, we find a novel operational interpretation of the mutual information of a quantum channel N as the optimal type II error exponent when discriminating between a large number of independent instances of N and an arbitrary "worst-case" replacer channel chosen from the set of all replacer channels.Comment: v3: 35 pages, 4 figures, accepted for publication in Communications in Mathematical Physic

How Do Food Shopping Behaviors Differ Between High-income and Low-income Shoppers in the Grand Rapids Metropolitan Area?

Background: The social determinants of health and health equity are influenced by access, environment, and socioeconomic status (SES). Health inequities are preventable and can be avoided with systemic policy change surrounding the distribution of wealth and resources. Few studies have researched the differences in different income levels and the influence income has on food shopping behaviors. Objective: The purpose of this study was to investigate the differences in food shopping behaviors between high-income and low-income shoppers living in the same zip code. Subjects Sixty-eight individuals who live in the 49341 zip code which represents a small city in Kent County, Michigan. Methods: Participants were recruited in collaboration with North Kent Connect and the Rockford Farmer’s Market. The participant survey contained demographic and food security questions. The survey allowed for participants to voluntarily enter their email address if they wished to attend a virtual interview for an in-depth discussion on food shopping behaviors. The surveys were analyzed using SPSS 25, two personal interviews, one for each income group were conducted via Zoom, transcribed, and hand-coded using thematic analysis. Results: The main themes from this qualitative study of a low and high-income participant in the 49341 zip code were that high-income food shopping behaviors were influenced by (1) types of foods needed, (2) household determinants of food value, (3) location and time of shopping, and (4) food safety habits. The low income shopper’s food behaviors were influenced by (1) type of store, (2) household determinants of food quality, (3) location and time of shopping, and (4) influence of children on shopping. Conclusion: There were differences and commonalities found in both the high and low-income participants surrounding their food shopping behaviors. The shoppers differed on dietary needs, meal planning, type of store shopped at, nutritional quality of foods but were fairly similar on COVID-19 impact, child influence, perception of health, and impulse purchases. More research is needed to expand on these findings including increasing sample size and racial and socioeconomic diversity

Do synaesthesia and mental imagery tap into similar cross-modal processes?

Synaesthesia has previously been linked with imagery abilities, although an understanding of a causal role for mental imagery in broader synaesthetic experiences remains elusive. This can be partly attributed to our relatively poor understanding of imagery in sensory domains beyond vision. Investigations into the neural and behavioural underpinnings of mental imagery have nevertheless identified an important role for imagery in perception, particularly in mediating cross-modal interactions. However, the phenomenology of synaesthesia gives rise to the assumption that associated cross-modal interactions may be encapsulated and specific to synaesthesia. As such, evidence for a link between imagery and perception may not generalize to synaesthesia. Here, we present results that challenge this idea: first, we found enhanced somatosensory imagery evoked by visual stimuli of body parts in mirror-touch synaesthetes, relative to other synaesthetes or controls. Moreover, this enhanced imagery generalized to tactile object properties not directly linked to their synaesthetic associations. Second, we report evidence that concurrent experience evoked in grapheme-colour synaesthesia was sufficient to trigger visual-to-tactile correspondences that are common to all. Together, these findings show that enhanced mental imagery is a consistent hallmark of synaesthesia, and suggest the intriguing possibility that imagery may facilitate the cross-modal interactions that underpin synaesthesic experiences. This article is part of a discussion meeting issue 'Bridging senses: novel insights from synaesthesia'

High School Students as Mentors: Findings From the Big Brothers Big Sisters School-Based Mentoring Impact Study Executive Summary

Recently, high schools have become a popular source of mentors for school-based mentoring (SBM) programs. This executive summary outlines key findings and recommendations from our High School Students as Mentors report, which drew on data from our large-scale random assignment impact study of Big Brothers Big Sisters SBM (Herrera, et al. 2007). Our research indicated that, on average, high school students were much less effective than adults at yielding impacts for the youth they mentor, but it also identified several program practices that were linked with longer, stronger and more effective high school mentor relationships

Neutron Stars in f(R) Gravity with Perturbative Constraints

We study the structure of neutron stars in f(R) gravity theories with perturbative constraints. We derive the modified Tolman-Oppenheimer-Volkov equations and solve them for a polytropic equation of state. We investigate the resulting modifications to the masses and radii of neutron stars and show that observations of surface phenomena alone cannot break the degeneracy between altering the theory of gravity versus choosing a different equation of state of neutron-star matter. On the other hand, observations of neutron-star cooling, which depends on the density of matter at the stellar interior, can place significant constraints on the parameters of the theory.Comment: Discussion extended, typos corrected, figures revised. Accepted for publication in PR