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Ankara University Faculty of Medicine Department of Neurosurgery Ankara Türkiye Cortical sensory potentials were evoked intraoperatively under general anaesthesia by median nerve stimulation in 13 out of 14 patients with frontoparietal tumour. In 13 patients, the central sulcus could be identified by phasereversal of cortical somatosensory evoked potential (CSEP) across the central fissure, CSEP recordings were obtained before and after excision of the tumour and in three patients evoked responses were also monitored throughout selected portions of the operative procedure. A representative case has been presented to illustrate how observations made with this method have been used to facilitate intraoperative management of the patient in an effort to limit postoperative morbidity. Keywords : Brain neoplasms, evoked potentials, somatosensory, sensory motor performance