We have previously shown that perceptual judgements of motion direction are based in part on the activity of direction selective neurons in extrastriate visual area MT (Salzman et al., 1990, 1992). In those experiments, we applied low-amplitude microstimulation pulses (10 microA, 200 Hz) to clusters of MT neurons whose preferred directions were similar. The effect of microstimulation was to bia...

We studied the eye movements evoked by applying small amounts of current (2-50 microA) within the oculomotor vermis of two monkeys. We first compared the eye movements evoked by microstimulation applied either during maintained pursuit or during fixation. Smooth, pursuitlike changes in eye velocity caused by the microstimulation were directed toward the ipsilateral side and occurred at short la...

To investigate the main clinical characteristics of intraspinal actinomycosis and help early diagnosis and treatment of this rare disease, we reported a case which was initially misdiagnosed as spinal cord tumor based on magnetic resonance imaging (MRI) findings. The diagnosis of intraspinal actinomycosis was eventually confirmed by histopathology. We further studied the relevant literatures to...

Intraspinal (leptomeningeal or intramedullary) metastases from primary intracranial gliomas have been well documented in several clinical and pathological series; however, symptomatic intraspinal metastases remain rare. We conducted a retrospective search of cases of intraspinal metastases treated at our centre and report four cases of symptomatic intraspinal leptomeningeal and intramedullary m...

BACKGROUND Idiopathic spinal arachnoid cysts are rare cystic masses of the spinal canal generally classified as intra- or extradural, based on anatomical presentation. However, this system may not effectively indicate treatment. OBJECTIVE To investigate the incidence, resection modality, and prognosis of spinal arachnoid cyst in a 15-year case series. PATIENTS AND METHODS A retrospective st...

Communicating hydrocephalus and/or papilloedema associated with intraspinal tumours is rare. Four such patients are presented in this article. In addition to previous theories put forward to explain this condition, we would like to propose alteration of craniospinal compliance distribution as a possible underlying mechanism. Consequently, we suggest not performing shunt placement immediately if...