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(1) The effects were studied of brief, reversible cooling of the dentate nucleus of two Cebus monkeys on the activity of 69 precentral neurons that were related to self-paced elbow flexions or extensions. Sixty-two neurons were studied when movements were randomly perturbed by transient load changes. (2) During unperturbed movements dentate cooling(More)
We attempted to identify the invariant kinematic properties of multijoint arm reaching movements in the horizontal plane to explore the planning variable(s) involved in their coordination. Different targets were placed near the perimeter of the workspace boundary, thereby causing variation of size and orientation of the hand stroke. We have a special(More)
The effects of stimulation of the corpus callosum (CC) on precentral neurons were studied in monkeys performing motor tasks with either forelimb. Of a total of 246 precentral neurons that were tested with CC stimulation, 70 were orthodromically and 12 were antidromically activated. The percentages of neurons orthodromically activated by CC stimulation were(More)
(1) Precentral neural activity was studied in relation to transient load changes on self-paced elbow movements. Four Cebus monkeys were trained to turn a freely moving handle back and forth between two targets by alternating self-paced elbow flexions and extensions. Torque pulses (of 10 or 100 msec) injected randomly to load or unload the movements(More)
The characteristics of the precentral neuron activity related to ipsilateral movements were studied while the monkey was performing finger, wrist and arm movements on either side. Out of 197 task-related neurons, 134 discharged in association with contralateral movements, but not with any one of 3 ipsilateral movements. Fifty neurons discharged with(More)
Physiological studies on the monkey retrosplenial (RS) cortex have been few, and its functional role remains to be investigated. In the present study, activity of the RS cortex was investigated using radioactive 2-DG while the monkey was performing a visual tracking task with a delay (a delayed-response task) for 45 minutes. A remarkable increase in 2-DG(More)
Uterine anomalies are associated with unilateral renal aplasia. We present the MR features of five cases with 'double' uteri. The anomalies consisted of four cases of uterus didelphys and one of a complete septate uterus. All the cases with uterus didelphys also had a longitudinal vaginal septum. The MR diagnoses were confirmed with hysterosalpingography(More)