Gilles Bertrand

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Data gathered from exploratory stimulation of the diencephalon in 130 stereotactic operative procedures have been studied, with the aid of a computer graphic technique, to show the position and topography of motor responses in the internal capsule. The results obtained indicate that pyramidal fibers are organized into a rostral-caudal face-arm-leg sequence(More)
Ventrolateral (VL) thalamotomy produced a marked reduction of oscillations related to the supraspinal components of Parkinson's disease tremor (4-7 Hz) and physiological tremor (8-12 Hz). Finger tremor was examined in nine patients undergoing unilateral VL thalamotomy and in nine age-matched controls. In comparison to the preoperative state, the relative(More)
Functional brain imaging and neurosurgery in subcortical areas often requires visualization of brain nuclei beyond the resolution of current magnetic resonance imaging (MRI) methods. We present techniques used to create: (1) a lower resolution 3D atlas, based on the Schaltenbrand and Wahren print atlas, which was integrated into a stereotactic neurosurgery(More)
A stereotaxic device is described for percutaneous twist-drill insertion of depth electrodes for seizure recording and brain biopsy. This apparatus, which permits a lateral orthogonal approach, has been used in conjunction with a Leksell type of stereotaxic frame. Its main advantages are the ample working space it provides at the site of insertion of(More)
With the aid of a computer graphic technique, data gathered from exploratory stimulation of the diencephalon in 130 stereotactic operative procedures indicate that some sensory fibers in the capsule are parallel to motor fibers at basal thalamic levels and occupy a position medial to motor fibers. In addition, stimulus responses which probably represent(More)
The authors have devised a clamp to fix the head to the surgical table during stereotactic procedures for placement of depth electrodes. The main advantages of this device derive from the rigid immobilization of the head. The clamp facilitates fixation of the stereotactic frame to the head, percutaneous twist drill trephination of any site of the skull,(More)
With the aid of a computer graphic display technique, data gathered from exploratory diencephalic recordings in 130 stereotactic operative procedures are presented to show the location and somatotopography of 'pressure'-evoked cellular responses. In addition, the variable position of these responses in relation to common diencephalic landmarks is presented.(More)