18987.不同背景亮度下貓初級(jí)視皮層神經(jīng)元的on反應(yīng)和off反應(yīng)

1、分類(lèi)號(hào)UDC密級(jí)編號(hào)中國(guó)科學(xué)院研究生院碩士學(xué)位論文丕國(guó)萱量壺廛至貓麴級(jí)塑皮屋袖經(jīng)丞的Q叢廈應(yīng)麴QEE廈應(yīng)袁鋒展鋒指導(dǎo)教師三塑班塞雖生墾科堂陵生物塑堡硒宜壓申請(qǐng)學(xué)位級(jí)別亟學(xué)科專業(yè)名稱生物物堡堂論文提交日期2Q至2生壘旦論文答辯日期2Q12生墨旦培養(yǎng)單位主國(guó)型堂瞳生物物理巫塞壓學(xué)位授予單位主國(guó)型堂陵硒塞生院二零一二年一／I月一夸一一=中月AbstractFengYuan(Biophysics)SupervisedbyProfYiWangLu

2、minanceinformationisthefundamentalinformationthatthevisualsystemreceives，whichincludestheincrement(ON)anddecrement(OFF)inlightlevelTheearlyvisualsystemhastwopathwaystoprocessthelightluminanceOneistheONpathwaytodetectthel

3、ightincrement，andtheotherisOFF‘pathwaytodetectthelightdecrementIntheearlystageofthevisualinformationprocessing，theONpathwayandtheOFFpathwayarelargelyseparate，andconvergeintheprimaryvisualcortexforthefirsttimeThepreviouss

4、tudiesindicatethatOFFdominantcellsoutnumberONdominantcells，andtheOFFpathwaydominatesoverON—pathwayintheprimaryvisualcortex(v1)TheseresultsaremainlyobtainedinafixedbackgroundluminanceThebackgroundluminance，howeverisnotcon

5、stantinthenaturalenvironmentTherefore，whetherthedominanceofOFFresponseoverONresponsemaintainsoverbackgroundluminanceremainsunknownThepsychologicalexperimentsshowthatthethresholdstodetectluminanceincrementanddecrementarer

6、elatedwiththebackgroundluminanceinhuman，buttheconclusionlacksthesupportofphysiologicalresultsWestudiedONresponseandOFFresponseoftheneuronsinthecatVlindifferentbackgroundluminances，andanalyzedtheONsubregionandtheOFFsubreg

7、ionoftheirreceptivefieldsWeshowedthattheOFFdominancewasmoreobviousinalowbackgroundluminanceWiththebackgroundluminanceincreasing，theONresponseincreasedsignificantlytheOFFresponsedidnotshowobviouschanges，andasaresulttheOFF

8、dominancewasweakenedMoreoverthepeaktimeofOFFresponsewasshorterthanthatofONresponse，andbothofthembecameshortenasthebackgroundluminanceincreasedTheseresultsareconsistentwiththoseofthepreviouspsychologicalexperimentsWediscu