Abstract

An influential assumption for the front end of models in vision, visual search, and object recognition is an analysis of independent features that correspond to basic image properties, such as motion, shape, and color. Empirically, one common test of independent features (a cue-summation study) measures performance with increasing available cues or features, with improving performance leading to conclusions of summation across independent features. In a study by Shimozaki [J. Vision2, 354–370 (2002)], both ideal and human observers showed no summation with large stimulus differences, in contrast to independent-feature models and suggesting that stimulus information (as assessed by an ideal observer) might affect cue-summation studies. Extending the previous summation study, observers performed a visual search of four Gabors differing in only orientation, only spatial frequency, or both orientation and spatial frequency, across a range of target–distractor differences. An ideal observer underpredicted human summation for small differences, whereas the independent-orientation and spatial-frequency feature models overpredicted human summation for large differences. An ideal observer with channels jointly tuned to spatial frequency and orientation predicted human performance across both small and large target–distractor differences.

© 2003 Optical Society of America

PDF Article
OSA Recommended Articles
Color category influences heterogeneous visual search for color

Kenji Yokoi and Keiji Uchikawa
J. Opt. Soc. Am. A 22(11) 2309-2317 (2005)

The achromatic mechanism and mechanisms tuned to chromaticity and luminance in visual search

Allen L. Nagy and Marc Winterbottom
J. Opt. Soc. Am. A 17(3) 369-379 (2000)

Age and visual search: expanding the useful field of view

Karlene K. Ball, Bettina L. Beard, Daniel L. Roenker, Richard L. Miller, and David S. Griggs
J. Opt. Soc. Am. A 5(12) 2210-2219 (1988)

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

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