Impaired value-based decision-making in Parkinson's disease apathy.

Apathy is a common and disabling complication of Parkinson's disease characterized by reduced goal-directed behaviour. Several studies have reported dysfunction within prefrontal cortical regions and projections from brainstem nuclei whose neuromodulators include dopamine, serotonin and noradrenaline. Work in animal and human neuroscience have confirmed contributions of these neuromodulators on aspects of motivated decision-making. Specifically, these neuromodulators have overlapping contributions to encoding the value of decisions, and influence whether to explore alternative courses of action or persist in an existing strategy to achieve a rewarding goal. Building upon this work, we hypothesized that apathy in Parkinson's disease should be associated with an impairment in value-based learning. Using a four-armed restless bandit reinforcement learning task, we studied decision-making in 75 volunteers; 53 patients with Parkinson's disease, with and without clinical apathy, and 22 age-matched healthy control subjects. Patients with apathy exhibited impaired ability to choose the highest value bandit. Task performance predicted an individual patient's apathy severity measured using the Lille Apathy Rating Scale (R = -0.46, P < 0.001). Computational modelling of the patient's choices confirmed the apathy group made decisions that were indifferent to the learnt value of the options, consistent with previous reports of reward insensitivity. Further analysis demonstrated a shift away from exploiting the highest value option and a reduction in perseveration, which also correlated with apathy scores (R = -0.5, P < 0.001). We went on to acquire functional MRI in 59 volunteers; a group of 19 patients with and 20 without apathy and 20 age-matched controls performing the Restless Bandit Task. Analysis of the functional MRI signal at the point of reward feedback confirmed diminished signal within ventromedial prefrontal cortex in Parkinson's disease, which was more marked in apathy, but not predictive of their individual apathy severity. Using a model-based categorization of choice type, decisions to explore lower value bandits in the apathy group activated prefrontal cortex to a similar degree to the age-matched controls. In contrast, Parkinson's patients without apathy demonstrated significantly increased activation across a distributed thalamo-cortical network. Enhanced activity in the thalamus predicted individual apathy severity across both patient groups and exhibited functional connectivity with dorsal anterior cingulate cortex and anterior insula. Given that task performance in patients without apathy was no different to the age-matched control subjects, we interpret the recruitment of this network as a possible compensatory mechanism, which compensates against symptomatic manifestation of apathy in Parkinson's disease.

Multicenter Randomized Controlled Trial to Assess an e-Learning on Acute Burns Management.

An e-learning tutorial was developed to cover the basic aspects of acute burns management. The aim of this study was to provide objective educational evidence supporting the role of an e-learning on acute burns management ("basic burns management" or BBM) when compared with traditional teaching methods when introduced in different medical school settings around the world. A multicenter randomized controlled trial was conducted at the University of Pittsburgh, Peninsula College of Medicine and Dentistry, and St. George's University of London comparing the learning experience of medical students with the BBM e-learning tool (intervention) and a traditional lecture (control). A group of medical students was randomly allocated to the e-learning or lecture arms. Both groups were subjected to a 10-question pre-intervention and post-intervention tests assessing burns knowledge, and were asked to fill out a satisfaction survey. A total of 79 medical students of varying years of study participated. As a whole, students demonstrated a significant gain in knowledge after intervention (overall = 47.6%, P < .001), regardless of medical school year of study or interest in surgery. Participants undertaking the BBM e-learning had a greater exam score improvement and satisfaction compared with the traditional lecture even though they were not statistically significant. BBM e-learning is a free tool that provides comparable acute burn care learning opportunity and satisfaction outcomes to a traditional lecture, allowing convenient and standardized incorporation of burns teaching within an educational setting, regardless of geographical location, level of experience, or interest in surgery.