[P300 potentials evoked by visual stimulation].
The P300 potential is a long-latency endogenous component of the event-related potentials to low-probability target stimuli. The same stimulus delivered without cognitive process does not provoke endogenous components; moreover event-related potentials are not dependent of the sensory pathways used for stimulating the subjects. P300 potential is a biological parameter used in scientific investigations in Clinical Neurophysiology, Neurology, Psychophysiology and Psychiatry. The most frequent methodology for obtaining P300 event-related potential is based on the 'odd-ball' paradigm using auditory stimulation. In this revision we analyzed the difficulties of this methodology and we propose to use the visual stimulation in order to obtain well defined P300 potential, based on a better signal to noise ratio and minor overlapping of exogenous and endogenous components of the evoked potentials. The improvement in the quality of the results obtained when comparing with auditory stimulation, it is supposed to facilitate that the use of P300 potential overflows the field of the investigation and permits their extensive use in the clinical practice.
Conill
J
J
Unitat de Toxicomanies, Hospital de la Sta, Creu i S. Pau, Barcelona, España.
D000161:Acoustic Stimulation; D003071:Cognition / Q000502:physiology; D018913:Event-Related Potentials, P300; D006801:Humans; D010775:Photic Stimulation
Potencial P300 provocado por estímulos visuales.