Repetitions in infinite palindrome-rich words

Rich words are characterized by containing the maximum possible number of distinct palindromes. Several characteristic properties of rich words have been studied; yet the analysis of repetitions in rich words still involves some interesting open problems. We address lower bounds on the repetition threshold of infinite rich words over 2 and 3-letter alphabets, and construct a candidate infinite rich word over the alphabet $\Sigma_2=\{0,1\}$ with a small critical exponent of $2+\sqrt{2}/2$. This represents the first progress on an open problem of Vesti from 2017.Comment: 12 page

Behavioral correlates of reaction time variability in children with and without ADHD.

OBJECTIVE: RT variability is often purported to indicate behavioral attention. This study seeks to examine whether RT variability in children with ADHD is associated with observed behavioral indicators of attention. METHODS: One-hundred forty-seven participants with and without ADHD completed five computerized neuropsychological tasks and an analogue math task. Linear mixed models were utilized to examine the relationship between observations of behavioral inattention during the analogue task and measures of RT variability from the neuropsychological tasks. RESULTS: Significant associations were observed between RT variability and mean duration of on-task behavior on the analogue math task. Secondary analyses indicated that on-task behavior during the math task was also related to accuracy on the neuropsychological tasks. CONCLUSIONS: RT variability, especially the portion of RT variability characterized by long RTs, appears to measure a cognitive phenomenon that relates to successful on-task academic behavior across children with and without ADHD. The relationship between RT variability and on-task behavior is present across multiple neuropsychological tasks and does not appear to be moderated by age, sex, or the presence of anxiety or depression

Use of Implant Retained Splint for Vestibuloplasty: Alternative to Conventional Technique

It is generally agreed that firmly attached keratinized mucosa surrounding the implant and abutment is thought to provide additional protection against mechanical trauma. Inflammation of soft tissue can result in peri-implantitis [1] with marginal bone loss or hyperplasia of surrounding mucosa. The purpose of this article is to describe our experience in using the two dental implants placed in the canine region in completely edentulous mandible and implant retained denture as a stent for vestibuloplasty

On avoidability of formulas with reversal

While a characterization of unavoidable formulas (without reversal) is well-known, little is known about the avoidability of formulas with reversal in general. In this article, we characterize the unavoidable formulas with reversal that have at most two one-way variables ($x$ is a one-way variable in formula with reversal $\phi$ if exactly one of $x$ and $x^R$ appears in $\phi$).Comment: 14 page

Negative Consequences of Poor Driving Outcomes Reported by Adolescents With and Without ADHD

Objective: Although adolescents with ADHD report less driving experience, a greater proportion of adolescents with ADHD report receiving at least one ticket; however, no study has examined the severity of infractions committed by adolescent drivers with ADHD. Method: A total of 61 adolescents (28 ADHD, 33 controls) aged 16 to 17 with a valid driver’s license completed a self-report Driving History Questionnaire (DHQ), which asked about months of driving experience, negative driving outcomes, and severity of consequences. Results: A greater proportion of adolescents with ADHD reported receiving fines, points on their driver’s license, and remedial driving class. Furthermore, adolescents with ADHD reported attending a greater number of hours in remedial driving class, and a greater expense associated with fines. Conclusion: Importantly, ADHD-related negative driving outcomes manifest early in driving careers. Furthermore, increased negative consequences of poor and/or risky driving among adolescents with ADHD were evident despite having fewer months of independent driving. </jats:p