| The twenty-1st century was the century of the "brain science".Event related potential(ERPs)is the main brain function physiological parameters of psychophysiology,is also an important index of psychophysiological process time sequence,capacity and processing process,can reflect the brain’s attention,memory and perception function changes,with the wide application of the technology in the field of sports,make the researchers from pay attention to sports technology and tactical training to brain cognitive processing process transfer,just conform to the research of "brain science".Volleyball,as a typical internet adversarial project,has a strong technical attack and defense,and has a higher technical requirements for the visual search and response ability of volleyball players.Research Objective:This study aims to compare the difference of visual search ability of different sports levels,and explore their relationship and ERPs characteristics,assist athlete selection from cognitive neuroscience,provide EEG basis for exercise load monitoring and exercise training level evaluation,and have reference value to the rehabilitation of related diseases.Research Methods:In this study,literature,questionnaire,experiment and mathematical statistics were selected,By recruiting 20 students(20 of them)from different levels of volleyball,19-25 years old,Bare or corrected visual >1.0,Right hand,There are four groups: HL、SGS、ESS and C,Ask subjects not to drink or smoke for 24 h before the experiment,Get enough sleep,The mental health status was evaluated by self-rating depression scale and self-rating anxiety scale;Apply E-prime2.0 software to program stimuli,Pictures with 15 letter C and 1 letter O,The 32 images are a loop,Four cycles,Using the visual search paradigm,By EGI(64 electrodes)accurately recording the subjects’ EEG,Using binaural mastoid as reference electrode,The P1 、N1、P2waveform,mean amplitude and brain topography of FP1、FP2、AFz、AF3、AF4electrode point were analyzed,Record reaction time and accuracy,This statistics compares the differences between groups.Research Results:(1)In terms of correctness: the HL group was significantly higher than the SGS group(P <0.05)and the C group(P <0.01)were significantly higher than the C group(P<0.01).(2)Response time: the HL group was significantly lower than the SGS(P <0.01),shorter reaction time,significantly lower than the C(P <0.01)and the longest in the C group.(3)On FP1 electrode: In P1 mean amplitude,(P<0.01);N1 mean amplitude,HL increased significantly compared with other two groups,HL and C,C and(P<0.01).compared with ESS(4)At FP2 electrode: in average P1 amplitude,HL increased significantly(P<0.01),HL from other groups(P <0.01),P2 increased significantly from other groups(P<0.01)and HL versus SGS(P <0.01).(5)At AFz electrode,HL,SGS,ESS P1 increased significantly higher than C(P<0.01);N1 increased significantly from other groups(P <0.01);for the average P2 amplitude,C was significantly higher than other groups(P <0.01).(6)At the AF3 electrode: in the P1 mean amplitude,the HL,SGS,ESS group increased significantly compared with the C group(P <0.01);in the N1 mean amplitude,the HL group increased significantly compared with the C group(P <0.01);in the P2 mean amplitude,the C group increased significantly compared with other groups(P<0.01).(7)At the AF4 electrode point,HL,SGS and ESS in P1 were significantly higher than those in C group(P<0.01);The mean amplitude of N1 in the HL group was significantly higher than that in the other groups(P<0.01),SGS and ESS were significantly increased compared with group C(P<0.01);The mean amplitude of P2 in group C was significantly higher than that in other groups(P<0.01).(8)Brain topography: the brain activation of HL was significantly greater than other groups(P <0.01),the most in HL and the lowest in C.(9)The visual search capability of the HL group was significantly greater than the other three groups,and its P1,P2 was significantly greater than the other groups.Research Conclusion :(1)Correct rate: Group HL was significantly higher than the other three groups,suggesting that the athletes in the group had stronger processing ability and more professional experience.(2)Response: Group HL was significantly shorter than the other three groups,implying that the faster athletes transmitted the stimulus information to the brain.(3)The P1 amplitude of Group HL was significantly greater than the other three groups,indicating that the athletes of the group were better able to quickly capture stimulus information during visual search.(4)The N1 wave amplitude of the HL group was significantly greater than the other three groups,implying that the group paid more attention to stimulus information,more attention resources and stronger information processing ability in the beginning stage of visual processing tasks.(5)The P2 wave amplitude of the C group was significantly greater than the other three groups,with better concentration than other experimental groups,and better key information search ability for stimulation than other groups.(6)Group HL had higher activation to the brain forehead area than the other three groups,indicating that the higher the brain stress level and the greater the arousal,this result is related to competition experience and training time. |
