不同难度的行为学任务对猕猴微眼动频率和幅度的影响

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1、上海交通大学硕士学位论文本研究课题通过搭建与完善猕猴视觉行为实验系统平台，包括Cortex系统、Bar系统、Reward系统、EyeCoil系统以及Plexon系统等软硬件，对实验室驯养的猕猴进行视觉注视和视觉注意等多种行为学任务训练。Plexon系统完成对猕猴的行为学反应和眼动信号的采集，最后利用MATLAB编程对采集到的猕猴眼动信号进行处理，从而得到不同难度的行为学任务中猕猴的微眼动信号的幅度、速率和频率。我们继续深入分析和对比了不同难度的视觉注视任务和不同难度的视觉注意任务下的猕猴微眼动的参数变化。关键词：眼球运动

2、，微眼动，视觉衰退，行为学实验平台-3-万方数据上海交通大学硕士学位论文THEEFFECTOFBEHAVIORTASKSWITHDIFFERENTDIFFICULTYLEVELSONMICROSACCADESFREQUENCYANDAMPLITUDEINMACAQUESABSTRACTThereisabout80%to90%oftheinformationfromoutsideworldobtainedbythehumanvisualsystem.Inourdailylife,oureyemovementsplayavi

3、talroleintheprocessingofvisualinformation.Itcanhelpustointegratevisualperceptionofthesurroundingenvironmentintoacoherentvisualpicture.Whileoureyesfixating,theyinvolvesinthreetypesofeyemovement:microsaccade,drift,andtremor.Microsaccadesarethelargestandfastesteyemo

4、vements.Itcanpromisecontinuousvisualstimulationtotheretinalphotoreceptorsandallvisualsystembychangingthepositionofanobjectprojectedintotheretina.Somicrosaccadescanhelpprimates,includinghumans,eliminatetheeffectofvisualfadingwhichcausedbytheadaptabilityofvisualner

5、voussystem,andensurethattheimagewillnotdisappearwhenwefixateonastaticobject.Recentstudieshaveshownthatmicrosaccadesarecloselyrelatedwithvisualperceptionfunctions,suchasvisualattention.Sothenervous-4-万方数据上海交通大学硕士学位论文systemgeneratingmicrosaccadesmaybepotentiallyass

6、ociatedwithmanyeyeandvisualsystemdiseases.Westudiedtherelationshipbetweenmicrosaccadesandvisualperceptionbehavior,suchasfixationtasksandattentiontasks,toexplainsomeofthefindingsinthefieldofvisualperception.Theunderstandingoftheneuralcorrelatesofmicrosaccadesgener

7、ationisbeneficialforfurtherexplorationofthebrainmechanismsofvisualinformationprocessing.Specifically,westudiedtwomonkeys’microsaccadesparametersincludingamplitude,velocityandfrequencyindifferentvisualtasksanddifferentdifficultylevelsinfixationtasks.Wedevelopedthe

8、behaviorexperimentalplatformtodothevisualfixationtasksandattentiontasks.TheplatformconsistsofCortexsystem,EyeCoilsystem,Barsystem,RewardsystemandPlexonmulti-ch