Purpose : This study is to investigate that influence of dominant eye on the neural mechanisms involved in visual inputs system using ERPs which are neural signals that reflect neural activity. Methods : Twenty three normal controls adults with right dominant eye and twenty normal controls adults with left dominant eye participated in this experiment. In initial screening, we had neuropsychological test with BAI and BDI-2. All participants had normal or corrected visual acuity 20/20. Edinburgh Handedness Inventory was carried out to select right-handed. To identify dominant eye, the hole-in- card test was executed repeatedly three times. To assess whether influence of dominant eye on the neural mechanisms involved in visual inputs system, event-related potentials (ERPs) were recorded with electroencephalography. Performance measure was the reaction time (RT). The ERPs in response to dominant eye in respect of visual field were investigated in three regions: the temporal-occipital, the occipital and the parietal regions. Especially, the P100 amplitude in occipital region, N170 amplitude in temporal-occipital region and the P300 amplitude in parietal region were explored. Results : A significant difference in RT was observed between the RVF and LVF, which the RVF exhibited shorter RT than the LVF with right hand in left dominant eye (t=-5.47, p<0.001). P100 latency showed that the RVF had shorter latency than the LVF with right hand in right dominant eye (p<0.001). N170 amplitude revealed that the RVF had larger amplitude than the LVF with right hand in right dominant eye (p<0.001). N170 latency revealed that the RVF had shorter latency than the LVF with right hand in right dominant eye (p<0.001). P300 amplitude and latency were no main effect for dominant eye. Conslusions : This present study has attempted to establish the influence of dominant eye on the neural mechanisms involved in visual inputs system. The conclusion which can be drawn from this study are that visual stimuli incoming from the RVF or LVF are differently recognized depends upon each dominant eye. That is, while the participants with right dominant eye responded more actively on stimuli coming from LVF than RVF when they conducted the experiment with their left hand, the participants with left dominant eye responded more actively on stimuli coming from RVF than LVF when they conducted the experiment with their right hand.

• Joong-Gu Kang(Department of Optometry, Eulji University)
• Seung-Hwan Lee(Clinical Emotion and Cognition Research Laboratory, Department of Psychiatry, Inje University Ilsan Paik Hospital)
• Hyun-Sung Leem(Department of Optometry, Eulji University)