Some dynamic features of depth perception.
نویسندگان
چکیده
Disparity cues affect a subject’s ability to detect movement only when stimulusoscillation frquency is less than 1 Hz. Disparity cues then increase sensitivity for targets closeto the fixation plane (within 7.5’), but decrease sensitivity for targets whose disparities aregreater. Binocular sensitivity to sideways movement is higher for targets in the fizxation planethan for targets with finite disparities. The effect of frequency upon depth sensitivity isdifferent for crossed, uncrossed and zero disparities. Suprathreshold depth sensitivity has asteeper high-frequency attenuation for uncrossed than for crossed disparities. One “stereo-anomalous” subject could see depth for crossed disparities but gave no depth responses at allfor uncrossed disparities. Some Dynamic Features of Depth Perception R&n;&-Les indications de disparitt n’affectent la capacite de detection de mouvement quesi la frequence d’oscillation du stimulus est moindre que 1 Hz. Les indications de disparitiaugmentent alors la sensibilitt pour des cibles pro&es; du plan de fixation (a moins de 73’)mais diminuent la sensibilitb pour des cibles de disparitb plus grandes. La sensibilite bino-culaire a des mouvements de c&t; est plus grande pour les cibles dans le plan de fixation quepour des cibles a disparites finies. L’effet de la frequence sur la sensibilite a la profondeurdiffere selon que la disparitt est homonyme, croisee ou nulle. La sensibilite supraliminale 21 la profondeur a une attenuation plus raide en haute frtquence pour la disparite homonyme que pour la croisee. Sur un sujet “st~eoanomal” la profondeur etait percue en disparitecrois&, mais il n’y avait pas du tout de reponse de profondeur en dispariti homonyme. Zusammenfassung-Disparationsmarkierungen beeinfiussen die Fahigkeit einer Versuchsper-son, eine Bewegung zu entdecken, nur dann, wenn die Oszillationsfrequenz des Testreizeskleiner als 1 Hz ist. Disparationsmarkierungen erhbhen dann die Empfindlichkeit ftir Test-reize nahe der Fiitionsebene (innerhalb 733, vermindem sie dagegen fur Tests, deren Dis-parationen griisser sind. Die binokulare Emptindlichkeit fiir die Seitwrirtsbewegung ist ftirTests in der Fixationsebene gr6sser als ftir Tests mit endlichen Disparationen. Der Ein6ussder Frequenz auf die Tiefenwahrnehmung ist fiir gekreuzte, fiir ungekreuzte und fiir Nulldis-parationen verschieden. Eine tiberschwellige Tiefenemp6ndung fallt f6r ungekreuzte Dispara-tionen zu hohen Frequenzen hin steiler ab als fiir gekreuzte Disparationen. Eine “stereoanomale”Versuchsperson konnte bei gekreuzten Disparationen Tiefe wahmehmen, nicht jedoch beiungekreuzten Disparationen. Pe3lome-Cnrtianbt nrrcnapamocm BNIRIOT ria cnoco6~oc~ b yenoaexa K o6trapmermropmixremur zonbxo B TOM cnflae, ecrm yacrora ocminnamig crnMyna Metiee 1 t-n. B 3~0~ CWTHaJ-IbIrWCMpaTHOCTE yBeJIEYBBaIOT YyBCTBXTeJIbHOCTb K o6bemaM HaXO3amENCR 6r1113~0K ToYKe &~cannE (B npene;lax 7,5 MHH), HO OHII ynienbatom rymamemmcnKo6bemaM JIECIIapaTHOCTbKOTOpbIX 6oname. &IHOKyJuIpHaSI; YyBCTBUTe,TbIiOCTbK 6OKOBbN BBBIKeHHIIM BbIIIIe ABS 06beKTOB HaXOWmIIIXCa B TOYKe @EKCaIIEE n0 CpaBHeHHIO C 06~~xrar+ni ribfetotmib3y onpenenemryro iurcnapamocrb. BnmmBe YacroTbI Ba nopor B~~~~FIJITEJIrnydmibr psU.YEYHO JIJIRnepeKpeCTHbIX, HeIIe~KpeuvlBaIOIIIEXCK E HyJIeBbIX JWIIapaI.IE&Ceepxnoporonaa rny6amrarr Y~BCTBET~~~HOCT~ IiMeeT 6osree KpyToe naneHEe rum BbIcoKHK YacToT npE HenepeKpemmiatonca micnapauEax, YeM np~ nepeirpecTnbrx. OB.BH ,,crepeoaHOMaJIbHbIf&, Cy6beh-r MOr BEIIeTb rny6mIy IIpE nepeKpemeHHbIX BECMpaIWIX, HO Hepearaposan Ha n3Menemrs rny6mmt npw ncex trenepexpememmrx nrrcnapauaxx.
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ورودعنوان ژورنال:
- Vision research
دوره 13 12 شماره
صفحات -
تاریخ انتشار 1973