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Midbrain

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3181. Corticofugal modulation of amplitude domain processing in the midbrain of the big brown bat, Eptesicus fuscus. (Abstract)

Corticofugal modulation of amplitude domain processing in the midbrain of the big brown bat, Eptesicus fuscus. Recent studies have shown that the corticofugal system systematically modulates and improves subcortical signal processing in the frequency, time and spatial domains. The present study examined corticofugal modulation of amplitude sensitivity of 113 corticofugally inhibited neurons in the central nucleus of the inferior colliculus (IC) of the big brown bat, Eptesicus fuscus. Cortical

2003 Hearing Research

3182. Addition of noise enhances neural synchrony to amplitude-modulated sounds in the frog's midbrain. (Abstract)

Addition of noise enhances neural synchrony to amplitude-modulated sounds in the frog's midbrain. The ability of 109 single units in the midbrain acoustic centre of frogs (Rana ridibunda, Rana temporaria) to reproduce 10%, 20 Hz sinusoidal amplitude modulation of a long-duration characteristic frequency tone was studied. The sinusoidal modulation was presented either in isolation or summed with a low-frequency (0-50 Hz) noise. Recordings were obtained in the adapted state. The magnitude

2002 Hearing Research

3183. Localizing value of torsional nystagmus in small midbrain lesions. (Abstract)

Localizing value of torsional nystagmus in small midbrain lesions. The topodiagnostic value and specificity of nystagmus in patients with mesencephalic lesions and its relation to tonic torsional deficits and vertical saccade deficits is controversial and anecdotal.The authors examined 11 patients with vascular MRI-identified mesencephalic lesions and clinical evidence of vertical-torsional nystagmus on gaze straight ahead, focusing on the three-dimensional nystagmus components recorded (...) and the subjective visual vertical were shifted to the contralesional side (n = 7). Torsional nystagmus to the ipsilesional side was uncommon (n = 3) and found in patients with midbrain lesions involving the iC, all of whom also had decreased time constants of the slow phases of gaze-evoked nystagmus.Contrary to previous proposals, contralesional torsional nystagmus was the most frequent direction and is probably not compensatory for contralesional tonic ocular torsion. Small amplitude vertical saccades

2002 Neurology

3184. Isolated superior rectus palsy due to contralateral midbrain infarction. Full Text available with Trip Pro

Isolated superior rectus palsy due to contralateral midbrain infarction. Isolated superior rectus palsy due to a contralateral midbrain lesion has not been reported.A 71-year-old woman suddenly developed diplopia. Examination showed that she had isolated superior rectus paresis. Magnetic resonance imaging showed a tiny infarct at the area of the oculomotor nucleus on the contralateral side.Isolated superior rectus palsy may be caused by a contralateral midbrain lesion that selectively involves

2003 Archives of Neurology

3185. Does ageing have an effect on midbrain premotor nuclei for vertical eye movements? (Abstract)

Does ageing have an effect on midbrain premotor nuclei for vertical eye movements? Currently, there is debate in the clinical literature as to whether defects in vertical gaze are a consequence of normal ageing or a component of an underlying neurodegenerative disorder. Although pathological changes have been demonstrated in diseased subjects, no study to date has addressed the question of normal ageing effects. In this retrospective study, we examined 23 neurologically and pathologically

2003 Movement Disorders

3186. Vim thalamotomy for Holmes' tremor secondary to midbrain tumour. Full Text available with Trip Pro

Vim thalamotomy for Holmes' tremor secondary to midbrain tumour. Holmes' (rubral or midbrain) tremor is an unusual combination of 2 Hz to 5 Hz rest, postural, and kinetic tremors of an upper extremity. This tremor has been considered to result from the lesions in the vicinity of the red nucleus in the midbrain. There has been no systematic analysis of the surgical target in the Holmes' tremor so far of nucleus ventrointermedius (Vim) or globus pallidus interna. This 26 year old man gradually (...) developed a disabling midbrain tremor involving both the distal and proximal parts of the left upper arm. Additional neurological findings included oculomotor palsy and ataxia of the left arm. On the radiological studies, a mass lesion (germinoma) was found on the midbrain tegmentum, which was treated by conventional radiation therapy. Although there was improvement in the radiological imaging, his midbrain tremor became intolerable despite medical treatment. The authors performed MR guided stereotactic

2002 Neurosurgery and Psychiatry

3187. Differentiating multiple system atrophy from Parkinson's disease: contribution of striatal and midbrain MRI volumetry and multi-tracer PET imaging. Full Text available with Trip Pro

Differentiating multiple system atrophy from Parkinson's disease: contribution of striatal and midbrain MRI volumetry and multi-tracer PET imaging. The differential diagnosis between typical idiopathic Parkinson's disease (PD) and the striatonigral variant of multiple system atrophy (MSA-P) is often difficult because of the presence of signs and symptoms common to both forms of parkinsonism, particularly at symptom onset. This study investigated striatal and midbrain findings in MSA-P and PD (...) ) were calculated on the basis of the individual MRI data. The PET data were transferred to the VOI datasets and subsequently analysed.MSA-P differed significantly from PD patients in terms of decreased putaminal volume, glucose metabolism, and postsynaptic D2 receptor density. The striatal FDOPA uptake was equally impaired in both conditions. Neither MRI volumetry nor PET imaging of the midbrain region further contributed to the differential diagnosis between PD and MSA-P.The extent and spatial

2002 Neurosurgery and Psychiatry

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