Tohoku Psychologic 乱 Folia 1979,38(1-4),29-35 DIFFERENTIALADAPTATIONTOINVISIBLE GRATINGSBLOCKEDBYSTEREO- SCOPICALL Y RAISEDPLANES By JIROGYOBA （行場次朗） (Depar. 倒的tofPsyc 加句 ・y,Tohoku University,Sendai) To inves も ig 叫 ewhe も her も hesp 乱もi 品 lfrequency processing under s 七 ereopsisproceeds ina“ top-down ”manner, Wei 鎚 tein ’ sexperimen も b 乱 sedonthe neuralsymbolic M も ivi も yhypo ぬesiswasreplic 乱もedunders も ereoscopicviewingcondi 色 ion. Five undergradua ゐ esinspeo 色 eda grating which w 晶sp 晶r も iallyblocked from view wi 七 h as も ereoscopicallyraisedrec も品 ngle ，も .henestim 晶もedも he品 pp 晶 rentcontrastof 品もest grating subsequently presen も edwi も hin 晶portionwhere も hegrating was 七 rune 乱もed ，乱nd at the same dep も hpl 品 ne 品 Sも hegrating. Corresponding 初 ourperceptual in も erpretation of ぬeover 乱1configuration in which the background gr 品 .tingvirtually appe 乱 rs to con ・ も inuebehind the raised rect 如 gle ，品 signific 品 ntdifferential depression wasobtained in 品 pparen もcon 七 rastof も hetest grating. Moreover, i もW乱 sconiirmedsuch 品 differenti 品 l 品daptationeffec も showedorientation-selectivity ，乱SWeiss 旬inrepor 色 ed. Al 七 houghJuleszhassugges も ed も h 的 sp 品七ialfrequency 島国々sersresidebefore も he stage of global s も ereopsis ，もheseresults imply ぬ抗 pa もおrnrecognition under s も紅白psis proceeds in 晶もop-downsequence, where 乱 nen も ire,global configur 乱もionis processed firs も 品ndthen componen 七spatialfrequencies 品 .rededuced from its ou 色 come. INTRODUCTION Recen 七 ly,ithasbeensugges 七 edthat pa ももernrecogni 七 ionbythehuman visual sys も emproceedsindual process of feature e 玄仕切もion and global interpret 叫ion (Lindsay & Norman, 1977). Whilemanyof出epreviousstudiesconcerning吋sual pat 句rnrecogni 七 ionh 乱 veusuallyconsidereda “ bo も七om-up" sequenceofprocessing, whereelementfe 叫uresarefirs 七ex も ractedfromvisu 乱larrayfollowedby subsequen 七 interpre 同七ionofrelationshipsbetweenthosefe 抗旧民七hereis乱 ccumulatingevidence for a"top-down"mode of processing, where local andcomponent features are deduced fromaproceedingin も erpr 的抗ionofanen 七 irepa 悦ern. Forexample,Weisstein(1970,1972)had Ss viewagratingwhichwasparti 乱lly blocked from view by a perspective drawing of a cube and found 七 hatadapta 七 ionoccur- red no もonly 七 o 七 .hosepor 七 ionsof 七 .hegra 七 ingwhich were visible but 乱 lso も o 七 hoseportions blocked from view. This 五 ndingc 乱nbe interpreted in 七 ermsof も hetop-down modeof visualinforma も ionprocessing, becausespa も ialfrequencyanalysisisconduc 七 edin乱 mannercorresponding七 oourpercep 七 ualinterpret. 叫ionof 七 heoverallcon 五 gur 抗 ionin which 七 heblocked grating virtually app 色町sto continue behind 七 hecube as 乱 background. However,in her drawing ，もhecube sometimes evokes perspective rev 巴 rsalsand does