Integrated effect of stimulation at fixation points on EFRP (eye-fixation related brain potentials)

• Published in: International journal of psychophysiology Vol. 32; no. 3; pp. 193 - 203
• Main Authors: Kazai, Koji, Yagi, Akihiro
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier B.V 01.06.1999; Elsevier Science
• Subjects: Adolescent; Adult; Analysis of Variance; Behavioral psychophysiology; Biological and medical sciences; Cerebral Cortex - physiology; Checkerboard patterns; Electrophysiology; Evoked Potentials - physiology; Eye-fixation related brain potentials (EFRP); Female; Fixation, Ocular - physiology; Fundamental and applied biological sciences. Psychology; Humans; Lambda response; Least-Squares Analysis; Male; Pattern Recognition, Visual - physiology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Saccades - physiology; Saccadic eye-movement; Size Perception - physiology; Time Factors; Lambda response; Eye-fixation related brain potentials (EFRP); Saccadic eye-movement; Checkerboard patterns; Human; Visual stimulus; Visual fixation; Vision; Electrophysiology; Perception; Event evoked potential; Saccadic eye movement
• ISSN: 0167-8760; 1872-7697
• DOI: 10.1016/S0167-8760(99)00010-0

The purpose of this study was to investigate the integrated effect of stimulation at the fixation points just before and just after saccadic eye-movement (saccade) on eye-fixation related brain potentials (EFRP: P75 and N105). Checkerboard patterns were used as stimuli. In Experiment 1, changes in check sizes between two fixation points enhanced the amplitude of P75, while changes in the phases of patterns between the two points did not affect EFRP. This result showed that EFRP was affected by two fixation points, and that changes in the retinal image between the two points did not necessarily affect EFRP. In Experiment 2, the relationship between EFRP and check size was investigated in detail. A second order relationship between logarithm of check size and the latency of P75, and a linear relationship between logarithm of check size and the amplitude of N105 were found. The effect of check size on the amplitude of P75 which might explain the increased amplitude of P75 observed in Experiment 1 did not appear. These results suggest that EFRP might reflect relative higher processing than peripheral stimulation at one fixation point.