title: Augmented P22-N31 SEP component in a patient with a unilateral space occupying lesion.
abstract: A patient presented with a right rolandic space occupying lesion resulting in a decrease of position sense, touch and stereognosis in the left upper limb. SEPs revealed an augmentation of the right hemisphere P22 component co-existing with relative attenuation of all other right hemisphere components. The augmented P22-N31 complex represented a 'giant' potential in relation to a control group (> 2.5 S.D.). The data provide further evidence that the P22-N31 complex has separate generators from those responsible for the N20-P27-N33 components parietally and P20-N30 components frontally. The focal nature of the lesion and symptomatology are of interest.
authors.affiliation: Department of Vision Sciences, Aston University, Aston Triangle, Birmingham, UK.
authors.forename: P L
authors.initials: PL
authors.lastname: Furlong
authors.forename: S
authors.initials: S
authors.lastname: Wimalaratna
authors.forename: G F
authors.initials: GF
authors.lastname: Harding
mesh_terms: D000368:Aged; D001932:Brain Neoplasms / Q000503:physiopathology* / Q000556:secondary; D004569:Electroencephalography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005625:Frontal Lobe / Q000503:physiopathology; D006225:Hand / Q000294:innervation; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000503:physiopathology; D009434:Neural Pathways / Q000503:physiopathology; D010296:Parietal Lobe / Q000503:physiopathology; D011930:Reaction Time