Effects of variability requirements on difficult sequence learning.

The present study investigated the effects of variability requirements on learning difficult target sequences in humans. Twenty university students emitted five-response sequences. For the experimental groups, 30 nontarget sequences were reinforced according to the Lag-10 variation criterion or the Lag-3 repetition criterion across conditions. For the control groups, the probability of reinforcers for nontarget sequences was yoked to that obtained by the experimental groups. In addition, for both groups, two difficult target sequences were continuously reinforced. U values were higher with the Lag-10 variation criterion than with the Lag-3 repetition criterion for the experimental groups and were unsystematic for the control groups. Higher U values ​​were accompanied by a random pattern in the emission of nontarget sequences for all groups. Higher levels of variability, regardless of whether they were directly produced by reinforcement or were contingency induced, facilitated learning of difficult target sequences.

Assessing Brazilian Medical Student Awareness About Global Surgery: A Survey-Based Study.

BACKGROUND: Global surgery is an interdisciplinary field that advocates for access to equitable, affordable surgical services for all people. Engaging medical students in the field can strengthen the surgical workforce in low- and middle-income countries. We aim to investigate Brazilian medical students' acknowledgment of global surgery and their preferred learning platforms. MATERIALS AND METHODS: We performed a cross-sectional study through an anonymous Portuguese survey on Google Forms, consisting of 30 mixed multiple-choice and five-point Likert scale questions. Students enrolled in a Brazilian medical school from the second to sixth academic year fulfilled inclusion criteria. The association between qualitative variables was assessed using Chi-square, Fisher's exact test, or binary logistic model. RESULTS: We received 1,345 responses from 208 medical schools. Only 20.9% (282/1,345) of participants reported awareness of global surgery, who were predominantly female. 96.5% (1,298/1,345) declared interest in knowing more about global surgery and participants indicated social media (71.6%, 202/282) as the prevalent manner to gain awareness on it, followed by webinars (63.5%, 179/282). Extracurricular classes were the most preferable option among students (61.4%, 827/1,345) to get acquainted with the field, followed by internships (59.4%, 812/1,345), workshops (57%, 767/1,345), and social media (53.4%, 730/1,345). The main obstacles to pursue a global surgery career were lack of national opportunities (32%, 431/1,345) and adequate training (25.4%, 341/1,345). CONCLUSION: We outlined the most strategic pathways to raising awareness on global surgery among Brazilian medical students, providing relevant insights on its education in similar settings.

Bird flu outbreak amidst COVID-19 pandemic in South Africa: Efforts and challenges at hand.

Over the months of April and May 2021, South Africa has witnessed several outbreaks of highly infective avian influenza (H5N1) in different poultry farms. This came as a shock to a country that was already battling with the deadly COVID-19 pandemic. The emergence of the virus has spurred import bans and massive culls in the poultry business. Local experts have also called for a restriction on the movement of people and cars in and out of their chicken farms. Employees have also been encouraged to shower in the mornings when they arrive at the farms and wear fresh clothes, as the flu spreads very quickly. In a country that is already facing the economic implications of the COVID-19, this has the potential to cause a significant dent in the economy, as well as severely impact people's day-to-day life. Bird flu-also called avian influenza-is a viral infection that can infect not only birds but also humans and other animals. The threat of a new influenza pandemic has prompted countries to draft national strategic preparedness plans to prevent, contain and mitigate the next human influenza pandemic. This paper describes the South African burden, current efforts, and preparedness against the avian influenza virus.