Ryuichi Matsuzaki

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'No-go potential', specific to the no-go reaction in go/no-go reaction-time hand movement with discrimination between different colour light stimuli, was recorded with electrodes chronically implanted in the prefrontal cortex of monkeys. Similar potentials were widely distributed over frontal-parietal parts of the human scalp on the same no-go reaction. In(More)
Our MEG studies on the human frontal association cortex are briefly reviewed. (1) The no-go potential was first found at go/no-go reaction-time hand movement task with discrimination between different colour light stimuli in the prefrontal cortex of monkeys. The potential was recorded in human subjects with EEG over the scalp, but its current dipoles could(More)
The cerebello-thalamo-posterior parietal cortical projections were investigated electrophysiologically and morphologically in macaque monkeys. In anesthetized monkeys, electrical stimulation of every cerebellar nucleus evoked marked surface-positive, depth-negative (s-P, d-N) cortical field potentials in the superior parietal lobule and the cortical bank of(More)
The basal ganglia play a pivotal role in reward-oriented behavior. The striatum, an input channel of the basal ganglia, is composed of subdivisions that are topographically connected with different cortical and subcortical areas. To test whether reward information is differentially processed in the different parts of the striatum, we compared reward-related(More)
We found 5-7 Hz magnetic theta waves in the frontal association cortex of adult human subjects during calculation and musical imagination by using 37-channel SQUID gradiometers. Simultaneous recording from the left and right cerebral hemispheres with two sets of 37-channel gradiometers revealed that the theta activity appeared in a waxing and waning manner(More)
Auditory evoked potentials (AEPs) were recorded in the motor cortices (MC) with chronically implanted electrodes in the rat. Some of the AEPs in the MC, namely negative potentials on the surface and positive ones at a depth of 2 mm at latencies of about 50-150 ms, were abolished by limited bilateral lesions of the anterior perirhinal cortex (PERa) which was(More)
Seven rats were well trained to move lever to the left by right forelimb at self-pace (self-paced forelimb movements). Cortical field potentials associated with self-paced forelimb movements were recorded by electrodes implanted chronically on the surface and at a 2.0 mm depth in the forelimb motor cortex on the left side. A surface-negative, depth-positive(More)
Cortical field potentials were recorded by electrodes implanted chronically on the surface and at a 2.0 mm depth in various cortical areas in the left hemisphere in the rat during self-paced movements of the right forelimb. A surface-negative (s-N), depth-positive (d-P) cortical field potential appeared about 1.0 s (range: 0.5-1.5 s) before movement onset(More)
Extracellular unit recording revealed that the dorsolateral pontine nucleus (DLPN) and nucleus reticularis tegmenti pontis (NRTP) of the cat constituted pontine relays for transmission of visual information from the superior colliculus (SC) to the posterior vermis (lobules VI and VII) of the cerebellum. The relay neurons in DLPN/NRTP responded to moving(More)