The neural mechanisms underlying time perception are of vital importance to a comprehensive understanding of behavior and cognition. Recent work has suggested a supramodal role for beta oscillations in measuring temporal intervals. However, the precise function of beta oscillations and whether their manipulation alters timing has yet to be determined. To accomplish this, we first re-analyzed two, separate EEG datasets and demonstrate that beta oscillations are associated with the retention and comparison of a memory standard for duration. We next conducted a study of 20 human participants using transcranial alternating current stimulation (tACS), over frontocentral cortex, at alpha and beta frequencies, during a visual temporal bisection task, finding that beta stimulation exclusively shifts the perception of time such that stimuli are reported as longer in duration. Finally, we decomposed trialwise choice data with a drift diffusion model of timing, revealing that the shift in timing is caused by a change in the starting point of accumulation, rather than the drift rate or threshold. Our results provide evidence for the intrinsic involvement of beta oscillations in the perception of time, and point to a specific role for beta oscillations in the encoding and retention of memory for temporal intervals.

No abstract

No abstract

Background:Opioids constitute the fastest-growing drug problem among children and adolescents in the United States. Recent heavy media coverage on the opioid prescription epidemic has garnered increased attention from prescribers and policymakers. The purpose of this study was to analyze trends in opioid prescribing for nonoperatively managed pediatric fractures and dislocations in order to examine changes in opioid-prescribing patterns across various U.S. regions.Methods:A retrospective review of the national Pediatric Health Information System (PHIS) database comprising 42 pediatric hospitals was performed to identify pediatric fractures and dislocations presenting to the emergency department (ED) or outpatient clinics from 2004 to 2017. We included patients with the 10 most frequently encountered diagnoses who were nonoperatively managed and were discharged home the same day. To account for hospital variation, we utilized a mixed-effects logistic regression model.Results:The final cohort included 134,931 patients, with a mean age (and standard deviation) of 12.57 ± 2.00 years (range, 10 to 18 years); 69.23% of patients were male. Overall, 51.69% of patients were prescribed at least 1 opioid dose during their ED or clinic visits. Of the patients receiving opioids, 72.04% were male and 54.10% were insured through a private insurance plan. When prescription trends were compared according to regions, children were more likely to be prescribed opioids in the South (71.37% more likely) and the Midwest (26.17% more likely) than in the Northeast.Conclusions:Although the opioid prescription rates in all 4 regions have decreased dramatically over the years, some regions were quicker than others in responding to the opioid epidemic. A significant interregional variability in opioid-prescribing practices still exists, but an overall downward trend in opioid prescription rates for acute pain management in conservatively treated pediatric fractures and dislocations is evidence of progress in tackling the opioid crisis.Clinical Relevance:Opioid-related misuse is a national epidemic and reducing the use of opioids in pediatric orthopaedic procedures is critical. Although regional variability in opioid-prescribing practices still exists, an overall downward trend in opioid prescription rates for acute pain management in conservatively treated pediatric fractures and dislocations is evidence of progress in tackling the opioid crisis.

The neural mechanisms underlying time perception are of vital importance to a comprehensive understanding of behavior and cognition. Recent work has pointed to a supramodal role for beta oscillations in coordinating endogenous timing mechanisms for the purpose of measuring temporal intervals. However, the majority of this work has employed paradigms relying on timed motor responses, which are confounded by beta’s established role in motor movement. Further, no study to date has tested if the alteration of beta oscillations subsequently impacts timing. Here, we address these concerns and demonstrate for the first time a causal connection between beta oscillations and timing. To accomplish this, we first re-analyzed two, separate EEG datasets from psychophysical experiments (Wiener, et al. 2012; 2015) demonstrating that beta oscillations are associated with the retention and comparison of a memory standard for duration, and that transcranial magnetic stimulation (TMS) of the right supramarginal gyrus leads to an increase in midline beta power during the encoding of a temporal interval, corresponding with a longer perceived interval of time. Next, we conducted a study of 20 healthy human participants using transcranial alternating current stimulation (tACS), over frontocentral cortex, at alpha (10Hz) and beta (20Hz) frequencies, during a visual temporal bisection task, demonstrating that beta stimulation exclusively shifts the perception of time such that stimuli are reported as longer in length, while preserving precision. Finally, we decomposed trial-by-trial choice data with a drift diffusion model of decision making and temporal encoding that reveals the shift in timing is caused by a change in the starting point of accumulation, rather than the drift rate or threshold. Our results provide causal evidence of beta’s involvement in the perception of time, and point to a specific role for beta oscillations in the encoding and retention of memory for temporal intervals.