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To investigate the effect of stimulus presentation rate on the activity of primary somatosensory cortex, we performed echo-planar functional magnetic resonance imaging using a 1.5-tesla magnetic resonance system. Eight right-handed normal volunteers underwent functional magnetic resonance imaging during somatosensory stimulation with a 0.2 ms electrical square wave to the left index finger at 1, 4,...
We studied cerebral metabolism in 82 patients with nonfamilial parkinsonism, including Parkinson's disease (PD; n = 23), progressive supranuclear palsy (PSP; n = 12), corticobasal degeneration (CBD; n = 19), multiple systemic atrophy (MSA; n = 18) and vascular parkinsonism (VP; n = 10) by using proton magnetic resonance spectroscopy ( 1 H-MRS), which allowed noninvasive measurement of signal...
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