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Event-related desynchronization (ERD) 2.0 sec before and 1.0 sec after movement in the frequency bands of 8-10, 10-12, 12-20 and 20-30 Hz and movement-related cortical potentials (MRCPs) to self-paced movements were studied from subdural recordings over the central region in 3 patients, and from scalp-recorded EEGs in 20 normal volunteers. In direct cortical recordings, the peak ERD response and...
The depth of threshold magnetic nerve stimulation can be estimated by using thresholds from two different-sized stimulus coils and plotting their induced electric field vs. depth profiles. Stimulation is presumed to take place where the two field profiles are equal. If the two coils have unequal inductances, however, there is a relative shift in threshold between coils that alters the intersection...
Direct cortical recordings were taken from 12 patients with implanted subdural electrode arrays during performance of a 2-dimensional, multi-joint, visually guided arm movement task. Task-related changes in the amplitude of the motor cortex 8-12 Hz surface local field oscillations were evaluated for the encoding of direction and amplitude of movement in the 6 patients in whom no epileptogenic or...
The reduction of motor cortex excitability by magnetic stimulation over the lateral basiocciput of normal subjects has up to the present time been attributed to an activation of cerebellar structures. This hypothesis was tested in one patient with complete agenesis and two patients with extensive infarction of one cerebellar hemisphere. Unexpectedly, stimulation over the intact and absent or damaged...
We employed magnetic stimulation to study the masseter silent period (SP) in 16 healthy volunteers. Cutaneous perception threshold (CPT or 1 T) was determined. SP threshold was 30% M (maximal output) in each subject, equivalent to 1.5-3 T, and as intensity increased, SP durations prolonged. The correlation was higher with units of % M (r = 0.89) than CPT (r = 0.39). The recommended intensity was...
Electromyographic (EMG) single motor unit potentials (MUPs) of the sternomastoid muscles (STM) were made before and after repeated treatment with botulinum type A toxin (Bx) for cervical dystonia. Post-treatment examinations were 6-25 weeks after the latest injection, when symptoms and EMG interference pattern had recurred and signs of denervation were scarce. Concentric needle EMG records of 200...
Changes in the firing probability of voluntarily activated motor units in the human lower limb were recorded in response to stimuli applied to peripheral nerves of the lower limb using surface electrodes. In each instance the monosynaptic Ia excitation produced byheteronymous afferent volleys was studied. This peak of excitation was found to increase with the intensity of the stimulation up to 2...
The median sensory nerve conduction between ring finger and wrist is a suitable parameter for early detection of carpal tunnel syndrome (CTS), although shorter segments of median nerve have also been proposed for the same goal. In order to assess the relative diagnostic value of the sensory nerve conduction velocity (SNCV) of the third palmar branch versus the SNCV of the second palmar branch, generally...
Quantitative EMG from the right frontal and both temporal muscles was studied in 547 adults randomly selected from the general population. The study was part of a multifaceted, epidemiological study of different headache disorders. Surface EMG was recorded by an observer blinded to the persons' history of headache, previous illness and mental state. The present study provides data on amplitude...
Muscle sympathetic nerve activity (MSNA) was recorded from peroneal nerve in 4 OSAS patients during sleep. During apneic episode, MSNA was enhanced, but it did not increase progressively toward the end of the apneic episode. MSNA remained at a stable level in the later part of an apneic episode. A surge of MSNA took place just preceding or just at the end of an apneic episode and it was followed...
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