Abstract

Intensive testing of spatial-frequency discrimination thresholds for 21% contrast gratings between 2.9 and 7.8 cycles/degree (c/deg) reveals, on average, smooth functions conforming to Weber’s law. Discrimination overall is very sensitive, indicating highly skilled performance, but there are no consistent peaks or troughs. Individual, single-run functions do vary, resulting in candidate peaks and troughs that might be proposed to reflect true variations in an observer’s sensory discrimination capacities. However, these features do not replicate from session to session nor from observer to observer. We do find consistent differences in overall sensitivity level between testing methods, with randomized presentation of reference frequencies giving significantly higher thresholds than blocked reference frequencies.

© 1986 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Modified line-element theory for spatial-frequency and width discrimination

Hugh R. Wilson and Douglas J. Gelb
J. Opt. Soc. Am. A 1(1) 124-131 (1984)

Spatial-frequency difference thresholds for central and peripheral viewing

Ellen S. Richter and Dean Yager
J. Opt. Soc. Am. A 1(11) 1136-1139 (1984)

Invariance of the slope of the psychometric function with spatial summation

Melanie J. Mayer and Christopher W. Tyler
J. Opt. Soc. Am. A 3(8) 1166-1172 (1986)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription