Consistent Individual Tendencies in Motor Speed-Accuracy Trade-Off

The literature of Speed-Accuracy Trade-Off (SAT) in motor control has evidenced individuality in the preference to trade different aspects (mean, variance) of spatial and temporal errors. Nonetheless, to the best of our knowledge, how robust this preference is has not been properly tested. Thirty participants performed nine conditions with different time and spatial criteria over two days (scanning). In-between these scanning conditions, individuals performed a practice condition that required modifications of the individuals’ preferences in SAT. Through Bayesian analyses, we found that, despite individuals demonstrating changes during practice, decreasing movement time, they did not modify how they performed the scanning conditions. This is evidence for a robust SAT individual tendency. We discuss how such individuality could modify how individuals perform within/between SAT criteria, and what this means for interpretation of results.

Application of Artificial Neural Networks for Corrosion Behavior of Ni-Zn Electrophosphate Coating on Galvanized Steel and Gene Expression Programming Models

Zn–Ni electrophosphate coating is one of the most commonly used materials in industrial applications. Corrosion resistance of this coating is very important in order to achieve the minimum corrosion current of the Zn–Ni electrophosphate coating. This paper described a new reliability simulation framework to determine the corrosion behavior of coating using gene artificial neural network (ANN) to estimate the corrosion current of the coating. The input parameters of the model are temperature, pH of electroplating bath, current density and Ni2+ concentration and corrosion current defines as output. The effectiveness and accuracy of the model was checked by utilizing absolute fraction of variance (R2=0.9999), mean absolute percentage error (MAPE=0.0171) and root mean square error (RMSE= 0.0002). The determined using genetic algorithm (GA) and the optimum practice condition are proposed.

Acute effects of a single unilateral balance training session on ipsi- and contralateral balance performance in healthy young adults

Objective While there is evidence on the short-term effects of unilateral balance training (BT) on bipedal balance performance, less is known on the acute effects of unilateral BT on unilateral (i.e., ipsi- and contralateral) balance performance. Thus, the present study examined the acute effects of a single unilateral BT session conducted with the non-dominant, left leg or the dominant, right leg on ipsilateral (i.e. retention) and contralateral (i.e., inter-limb transfer) balance performance in healthy young adults (N = 28). Results Irrespective of practice condition, significant improvements (p < 0.001, d = 1.27) in balance performance following a single session of unilateral BT were observed for both legs. Further, significant performance differences at the pretest (p = 0.002, d = 0.44) to the detriment of the non-dominant, left leg diminished immediately and 30 min after the single unilateral BT session but occurred again 24 h following training (p = 0.030, d = 0.36). These findings indicate that a single session of unilateral BT is effective to reduced side-to-side differences in balance performance, but this impact is only temporary.

Motivation and Problem Solving Versus Mobile 360° Videos to Promote Enrollment in the National Diabetes Prevention Program’s Lifestyle Change Program Among People With Prediabetes: Protocol for a Randomized Trial

Background More than 88 million Americans are at risk of developing type 2 diabetes mellitus (T2DM). The National Diabetes Prevention Program’s Lifestyle Change Program (DPP LCP) has been shown to be effective in reducing the risk of progressing from prediabetes to T2DM. However, most individuals who could benefit from the program do not enroll. Objective The aim of this trial is to test the real-world efficacy of 3 mobile phone–based approaches to increasing enrollment in the DPP LCP including a best-practice condition and 2 novel approaches. Methods We will conduct a 3-armed randomized clinical trial comparing enrollment and 1-month engagement in the DPP LCP among adults with prediabetes from 2 health care settings. Participants in the best-practice condition will receive SMS-based notifications that they have prediabetes and a link to a website that explains prediabetes, T2DM, and the DPP LCP. This will be followed by a single question survey, “Would you like the DPP LCP to call you to enroll?” Participants in the 2 intervention arms will receive the same best-practice intervention plus either 2 mobile 360° videos or up to 5 brief phone calls from a health coach trained in a motivational coaching approach known as Motivation and Problem Solving (MAPS). We will collect measures of diabetes-related knowledge, beliefs in the controllability of risk for T2DM, risk perceptions for T2DM, and self-efficacy for lifestyle change pre-intervention and 4 weeks later. The primary outcomes of the study are enrollment in the DPP LCP and 4-week engagement in the DPP LCP. In addition, data on the person-hours needed to deliver the interventions as well as participant feedback about the interventions and their acceptability will be collected. Our primary hypotheses are that the 2 novel interventions will lead to higher enrollment and engagement in the DPP LCP than the best-practice intervention. Secondary hypotheses concern the mechanisms of action of the 2 intervention arms: (1) whether changes in risk perception are associated with program enrollment among participants in the mobile 360° video group and (2) whether changes in self-efficacy for lifestyle change are associated with program enrollment among participants in the MAPS coaching group. Finally, exploratory analyses will examine the cost effectiveness and acceptability of the interventions. Results The project was funded in September 2020; enrollment began in February 2021 and is expected to continue through July 2022. Conclusions We are conducting a test of 2 novel, scalable, mobile phone–based interventions to increase enrollment in the DPP LCP. If effective, they have tremendous potential to be scaled up to help prevent T2DM nationwide. Trial Registration ClinicalTrials.gov NCT04746781; https://clinicaltrials.gov/ct2/show/NCT04746781 International Registered Report Identifier (IRRID) DERR1-10.2196/28884

Motivation and Problem Solving Versus Mobile 360° Videos to Promote Enrollment in the National Diabetes Prevention Program’s Lifestyle Change Program Among People With Prediabetes: Protocol for a Randomized Trial (Preprint)

BACKGROUND More than 88 million Americans are at risk of developing type 2 diabetes mellitus (T2DM). The National Diabetes Prevention Program’s Lifestyle Change Program (DPP LCP) has been shown to be effective in reducing the risk of progressing from prediabetes to T2DM. However, most individuals who could benefit from the program do not enroll. OBJECTIVE The aim of this trial is to test the real-world efficacy of 3 mobile phone–based approaches to increasing enrollment in the DPP LCP including a best-practice condition and 2 novel approaches. METHODS We will conduct a 3-armed randomized clinical trial comparing enrollment and 1-month engagement in the DPP LCP among adults with prediabetes from 2 health care settings. Participants in the best-practice condition will receive SMS-based notifications that they have prediabetes and a link to a website that explains prediabetes, T2DM, and the DPP LCP. This will be followed by a single question survey, “Would you like the DPP LCP to call you to enroll?” Participants in the 2 intervention arms will receive the same best-practice intervention plus either 2 mobile 360° videos or up to 5 brief phone calls from a health coach trained in a motivational coaching approach known as Motivation and Problem Solving (MAPS). We will collect measures of diabetes-related knowledge, beliefs in the controllability of risk for T2DM, risk perceptions for T2DM, and self-efficacy for lifestyle change pre-intervention and 4 weeks later. The primary outcomes of the study are enrollment in the DPP LCP and 4-week engagement in the DPP LCP. In addition, data on the person-hours needed to deliver the interventions as well as participant feedback about the interventions and their acceptability will be collected. Our primary hypotheses are that the 2 novel interventions will lead to higher enrollment and engagement in the DPP LCP than the best-practice intervention. Secondary hypotheses concern the mechanisms of action of the 2 intervention arms: (1) whether changes in risk perception are associated with program enrollment among participants in the mobile 360° video group and (2) whether changes in self-efficacy for lifestyle change are associated with program enrollment among participants in the MAPS coaching group. Finally, exploratory analyses will examine the cost effectiveness and acceptability of the interventions. RESULTS The project was funded in September 2020; enrollment began in February 2021 and is expected to continue through July 2022. CONCLUSIONS We are conducting a test of 2 novel, scalable, mobile phone–based interventions to increase enrollment in the DPP LCP. If effective, they have tremendous potential to be scaled up to help prevent T2DM nationwide. CLINICALTRIAL ClinicalTrials.gov NCT04746781; https://clinicaltrials.gov/ct2/show/NCT04746781 INTERNATIONAL REGISTERED REPORT DERR1-10.2196/28884

Retrieval practice facilitates memory updating by enhancing and differentiating medial prefrontal cortex representations

Updating old memories with new, more current information is critical for human survival, yet the neural mechanisms for memory updating in general and the effect of retrieval practice in particular are poorly understood. Using a three-day A-B/A-C memory updating paradigm, we found that compared to restudy, retrieval practice could strengthen new A-C memories and reduce old A-B memory intrusion, but did not suppress A-B memories. Neural activation pattern analysis revealed that compared to restudy, retrieval practice led to stronger target representation in the medial prefrontal cortex (MPFC) during the final test. Critically, it was only under the retrieval practice condition that the MPFC showed strong and comparable competitor evidence for both correct and incorrect trials during final test, and that the MPFC target representation during updating was predictive of subsequent memory. These results suggest that retrieval practice is able to facilitate memory updating by strongly engaging MPFC mechanisms in memory integration, differentiation and consolidation.

The illusion of knowing in college: A field study of students with a teacher-centered educational past

In the present study, the tendency to overestimate performance (illusion of knowing) was examined in college students whose educational past experiences had emphasized verbatim learning. Female students enrolled in core curriculum classes were sampled. Classes taught by the same instructor were randomly assigned to a self-assessment practice condition, where students predicted their test and class performance and were asked to reflect on discrepancies between predictions and actual performance, or to a control condition. At the end of the semester, irrespective of condition, as performance declined on the final test, predictions of final test grades became more inflated, but less confident, indicating that students were aware of their own deficiencies. Overall, students in the practice condition displayed not only greater prediction accuracy, but also greater final test performance than students in the control condition. Practice, however, benefited the most self-assessment accuracy of students whose final test grades were just above the passing grade. Although the responses to self-assessment practice of students with a teacher-centered educational past were largely similar to the responses of students from Western countries reported in the extant literature, differences in impact and meaning could be inferred.

Examining the episodic context account: does retrieval practice enhance memory for context?

Retrieval practice, such as filling in blanks or taking quizzes, is firmly established as an effective study strategy. However, the underlying mechanism of how retrieval practice benefits memory is still unclear. One current theory, the episodic context account, proposes that retrieval enhances memory by reinstating a prior learning context. This retrieved context is then strengthened and updated to include context at the time of recall, which later serves as an effective retrieval cue. However, few studies have directly tested this hypothesis. We did so by examining participants’ memory for the initial study context. Across three experiments, participants encoded cue-target pairs presented in different colors and either restudied or practiced retrieving the targets. If retrieval practice benefits memory by reinstating the prior episodic context, participants who successfully retrieved the items during practice should have enhanced memory for context details (i.e. font color) compared to participants who restudied the pairs. Contrary to this prediction, memory for font colors did not differ between the restudy condition and the retrieval practice condition. Even when font color was actively attended to and integrated with the to-be-remembered items, retrieval practice did not increase memory for this aspect of context. Our results suggest that the context reinstated during retrieval practice is limited in nature. Aspects of the context that are not essential to retrieval of the item are not strengthened by retrieval practice.

Therapist Guided Activity Practice for Depressive Symptoms in University Students: A Randomized Controlled Trial

Behavioral activation (BA) interventions are efficacious for depression, yet a substantial minority of patients do not respond to treatment. Strategies that facilitate activity outside of session may improve BA treatment outcomes. The objective of the current study was to examine whether briefly practicing a target activity (guided practice) during a modified single session of BA resulted in higher homework completion compared to activity planning alone (control). Participants (n=100) were college students with depressive symptoms. All participants selected an activity to monitor for 7 days with a goal of completing the activity 5 times. Self-report questionnaires were completed at baseline and 7-days later. Contrary to our hypothesis, participants assigned to the guided practice condition did not evidence a greater improvement in self-efficacy for completing the targeted activity relative to the control condition. However, there was a positive effect of guided practice on activity completion. Participants assigned to the guided practice condition evidenced a higher rate of activity completion relative to those assigned to the control condition. These results support the utility of guided practice as a strategy for improving homework compliance in BA.