ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

The color-matching functions of individual tritanopes differ significantly from those predicted with the assumption that the two cone pigments of the tritanope are those which underlie the matches of the standard observer. The differences cannot be explained completely by the abnormal luminosity curve of the standard observer nor by abnormalities in transmissivity of the eye media. Individual tritanopes differ significantly in their color matches in ways not entirely accounted for by eye media differences. The results are consistent with the view that there are a variety of different long- and medium-wave-sensitive cone visual pigments among different tritanopes.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

In this paper, the fourth in a new series, we have examined the properties associated with illuminated sectors of the annular “sensitization” zone of the psychophysical Westheimer function. The results for one-, two-, and four-sector annular background fields indicate simple additivity of effects within the sensitization region when the flashing test field was set substantially above its increment threshold. Under such conditions effects of pattern orientation and borders within the sensitization zone were found to be negligible. The present findings provide a basis for relating the newly developed “transient-like” psychophysical test (which uses a windmill-type stimulus) to the Westheimer function

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

摘要:

The implications of the diffraction theory of light are examined as they relate to visual acuity and hyperacuity. Two incoherent point sources of light give rise to a double-peaked light distribution whose trough is 26% below the adjoining peaks when the sources are separated by the Rayleigh limit of resolution, but the dip has vanished when the separation is 80% of the Rayleigh limit. Diffraction theory, however, places no restriction on the precision with which any single source can be localized. No paradox is therefore involved in having a point-spread function with half-width one minute of arc and, at the same time, a localization threshold of a few seconds of arc, although the need for a sophisticated processing mechanism to achieve such low hyperacuity thresholds is emphasized.

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID

ISSN:0093-7002    

出版商:OVID    

年代:1976

数据来源: OVID