title: [Comparative study of the amplitude, surface and duration of the pre- and post-imperative waves of the CNV (contingent negative variation) in a group of 40 schizophrenic and schizo-affective patients as compared with normal subjects].
abstract: In 27 normal adult subjects, pre- and postimperative phases of the CNV had an homogeneous pattern. The return to the baseline was of short duration (320 +/- 170 msec) whatever the amplitude and surface. This is in favor of an active mechanism terminating the CNV. In 27 schizophrenic and 13 schizoaffective patients, pre- and postimperative phases of the CNV were heterogeneous in character suggesting the possibility of multiple disturbances. When present, the preimperative negativity was of lower amplitude and had a delayed return to the baseline with a wider dispersion. In the patients with preimperative negativity followed by a PINV (postimperative negative variation), a linear relationship has been found between the amplitudes of the two waves.
authors.affiliation: Institut Fond'Roy, Bruxelles, Belgique.
authors.forename: S
authors.initials: S
authors.lastname: Borenstein
authors.forename: G
authors.initials: G
authors.lastname: Cheron
authors.forename: M
authors.initials: M
authors.lastname: Toscano-Aguilar
authors.forename: M
authors.initials: M
authors.lastname: Ludwig
mesh_terms: D000328:Adult; D003265:Contingent Negative Variation; D004569:Electroencephalography; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011618:Psychotic Disorders / Q000503:physiopathology*; D012559:Schizophrenia / Q000503:physiopathology*
vernacular_title: Etude comparative de l'amplitude, de la surface et de la durée des ondes pré- et postimpératives de la VCN chez un groupe de 40 schizophrènes et schizo-affectifs par rapport à des sujets normaux.