Erika Grünewald-Zuberbier

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Volun ta ry m o v e m e n t r e l a t e d slow potent ia l shifts have b e e n s tudied extensively in short ballistic m o v e m e n t s [2, 9]. The most characterist ic features so far establ ished are: a slow increasing negat ive shift about 1 sec pr ior to move me n t , with a fur ther increase in slope shortly before (or after) E M G o n s e t , and(More)
The purpose of this study was to determine whether the late component of the contingent negative variation (CNV) in a S1-S2-respond paradigm shares critical features with the Bereitschaftspotential (BP) prior to self-paced voluntary movements. In a group of 8 subjects, the late CNV and the BP exhibited: (a) similar effects of response speed variation, (b)(More)
Previous research has demonstrated that delayed nonverbal information feedback (IF) about the correctness of a positioning movement is preceded by a contingent negative variation (CNV) which is larger over the right hemisphere independent of movement side. It was hypothesized that this asymmetry is a manifestation of functional hemispheric specialization,(More)
Somatosensory evoked potentials (SEPs) and EMG responses to mechanical disturbances of positioning movements of the index finger were recorded from normal subjects who performed smooth flexions against the constant load of a torque motor in order to reach a specified target zone. According to a random series 60% of the movements were disturbed by step(More)
During smooth goal-directed hand movements a negative potential shift can be recorded from the human scalp. This goal-directed movement potential (GDMP) is preponderant over central areas with a maximum at the vertex and, over the motor cortex, contralaterally larger than ipsilterally to the moving hand. In 11 right-handed and 6 left-handed subjects, the(More)
Movement-related potentials recorded from the scalp of man were investigated in two skilled positioning tasks, requiring flexions at different joints of the upper extremities. The average response time was approximately 1 sec. Subjects paced their movements themselves and performed without visual control or other external cues. After each trial a delayed(More)
During voluntary isometric slow ramp contractions of the hand up to an internally defined target force level sustained negative potential shifts in the EEG were recorded from 6 human subjects. The potential shifts are composed of (a) a bilateral wide spread negativity with a maximum amplitude at the vertex, and (b) a smaller negative wave contralateral to(More)