Functional Magnetic Resonance Imaging (fMRI) has become one of the most powerful tools in neuroscience research, with promising applications in clinical practice. Particularly, fMRI based on blood oxygenation level dependent (BOLD) contrast has gained a primary role in the study of human brain and spinal cord, for the characterization of normal and pathological brain/spinal cord (SC) activity. In this framework, we have studied and report the characterization of the functional response of the SC to a multilevel motor task, designed to assess the linearity of the hemodynamic response as a function of the intensity of a graded task.
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