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The overall objective of this study is to extend previous work in the development of methods to automatically detect the timing of cocaine use from cardiac interbeat interval and physical activity data derived from wearable, unobtrusive mobile sensor technologies. The specific objectives of this protocol are to characterize under which conditions high quality continuous interbeat interval data and physical activity data can be obtained from a specially developed smartwatch device in the natural field setting among a population of cocaine users. In addition to identifying common failure scenarios and understanding wearability/usage patterns when collecting interbeat interval from smartwatches, this study will extend previous work in the detection of cocaine use via interbeat interval and physical activity data that were previously obtained from wearable chestband sensors. Information from this study will contribute toward the adaptation of the investigators' existing computational model for detecting cocaine use via the chest sensors, so it can be applied to the interbeat and physical activity data obtained from less obtrusive smartwatches.
Cocaine/Crack Dependence has been associated with neuropsychological impairments mainly in executive functions and decision-making, which are predominantly managed by the prefrontal cortex (PFC) in the brain. However, none study in Neuropsychological Rehabilitation (NR) has been done in order to remediate the executive functioning in this population. The aim of this research is to investigate the impact of neuropsychological intervention based on the stimulation of cognitive functions such as attention, planning, organization, logical reasoning, executive functioning, and decision making. For this research it will be proposed interventions through motivational strategies and board games, especially chess because it has been associated with PFC functioning, since it is a game which requires complex cognitive abilities, such as: inhibitory control, mental flexibility, sustained attention, future planning and decision-making. There will be two groups of patients with cocaine/crack dependence (n = 56), one with NR (group A, n = 28) and another without NR (group B, n = 28). Group B will be submitted to the placebo intervention. Both groups will be submitted to an extensive battery of neuropsychological tests and psychopathological rating scales before and after interventions. A sub-group will also be submitted to functional magnetic resonance imaging and biomarkers measures (BDNF and cortisol). The hypothesis is that group A will present a pronounced improvement not only on the neuropsychological test but also on the PFC functioning in neuropsychological functions compared to group B.