Preliminary Study On The Brain Cognitive Event Related Potential With Different Stimulative Colour

Purpose: The study applied event-related potential (ERP) to stimulate health adult with red/green and blue/yellow colour stimulations as to search for each colour stimulations'ERP components and their mutual relationships as well as their different characteristics of scalp distribution, further to investigate the character and difference of brain processing on red/green and blue/yellow colour visual information. Hope to provide basic information to explore the objective evaluation method of colour vision function.Method: The study orderly examined the electroencephalic response while 20 subjects with normal visual function were receiving different stimulative colour with the other eye covered. According to the difference of stimulative colour, the study were divided into two parts:(1) The ERP was recorded in the condition of white, red and green circle-shaped visual stimulation respectively;(2) The ERP was evoked in the condition of white, blue and yellow circle-shaped visual stimulation respectively;During testing subjects were required to respond explicitly to the target while event-related potentials were recorded from their scalps.Results: (1) The ERP stimulated by red/green colour:The early ERP components exhibited significantly shorter N1 and P2 over the extensive encephalic region in red target stimulus than in green target stimulus; In addition, the red target stimulus elicited significant larger N1 over the fronto-central regions but smaller P2 than the green. Moreover,the N1 showed an evident dominance effect over the left rather than the right hemisphere, instead, the P2 suggested a right hemispheric dominance effect. Similar to the early ERP component N1, the late ERP N2 showed that, in comparison with the green target stimulus, the red target stimulus caused the latency of N2 significantly shortened and larger N2 over widespread brain regions. Otherwise, it resulted in the latency of P3 significantly prolonged and smaller P3 over widespread brain regions. At the same time, P3 as well as N2 reflected a prominent effect of left hemispheric superiority;(2) The ERP stimulated by blue/yellow colour: The early ERP components exhibited significantly shorter N1 and P2 over the extensive encephalic region in yellow target stimulus than in blue target stimulus; In addition, the yellow target stimulus elicited larger N1 and P2 than the blue. Moreover,the amplitude of P2 showed an evident dominance effect over the right rather than the left hemisphere. Similar to the early ERP components, the late ERP ones showed that, in comparison with the yellow target stimulus, the blue target stimulus caused the latencies of N2 and P3 significantly prolonged over widespread brain regions, as well as smaller N2 and P3, at the same time, P3 reflected a prominent effect of left hemispheric superiority.Conclusions: These different colour stimulations'ERP findings showed that: (1)In isoluminant red/green condition, our brain is more sensitive to the red color. The red color not only principally induces the ERP components N1, P2, N2 shortened latency and N1, N2 increased amplitude, but also causes smaller P2, P3 and the latency of P3 significantly prolonged; (2) In isoluminant blue/yellow condition, our brain is more sensitive to the yellow colour. The yellow colour not only principally induces the early ERP components N1 and P2 shortened latency and increased amplitude, but also causes a similar effect on the late N2 and P3 components; (3) In the future, Colour ERP may play a significant application value in the forensic basic research and the identification of forensic clinical cases.