Neurocognitive Assessment: Neurocognitive Analysis

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Neurocognitive Assessment: Neurocognitive assessment will be performed by a team of trained psychologist. Patients will be evaluated using classical well-validated paradigms designed to measure a set cold and hot executive functions in a touch screen interactive platform (Cold functions: sustained attention, shifting attention, response inhibition, working memory; hot functions: conditioned learning, sensibility to reward). The system allows to individualize the characteristics (response time, correct/incorrect trials, etc.) of the responses from each one of the presented stimuli, with important flexibilities for posterior data analysis. The following paradigms were pre-selected for this study: Attentional Blink,49 CPT,50 Flanker Test,51
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Serum sphingolipids will be analyzed in the Department of Pathology and Cell Biology of Columbia University, as part of an active collaboration with Dr. Tilla S. Worgall and/or in the Laboratory of Toxicology and HPLC of the Department of Clinical Laboratories, Pontificia Universidad Católica de Chile. Sphingolipid levels will be quantified by high performance liquid chromatography-triple quadrupole-tandem mass spectrometry (HPLC-MS/MS) on an Agilent 1200 HPLC system, equipped with an Agilent C18 column as described in protocol implemented and validated by our group2. Sphingolipid profiles will include the following molecular species: 1) sphinganine-1-phosphate and sphingosine-1-phosphate; 2) Ceramides C16:0, C18:0, C20:0, C22:0, C24:0 and C24:1; dihydroceramides C18, C18:1, C24:0 and C24:1; deoxy-ceramide C16:0 and C24:1 and deoxy-dihydroceramides C16:0 and C24:1; 3) sphingomyelins (SM) SM C16:0, SM C18:0, SM C18:1 and SM C24:1. The limits of sphingolipid quantification range from 1nM for all long chain bases, including deoxy and desoxy-sphinganines and 0.01 uM for sphinganine and sphinganine-1-phosphate. All measurements will be performed in

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