McCourt M E, 2005, "Comparing the spatial-frequency response of first-order and second-order lateral visual interactions: Grating induction and contrast - contrast" Perception 34(4) 501 – 510
Download citation data in RIS format
Comparing the spatial-frequency response of first-order and second-order lateral visual interactions: Grating induction and contrast - contrast
Mark E McCourt
Received 16 July 2004
Abstract. The magnitudes of two suprathreshold lateral spatial-interaction effects -- grating induction and contrast - contrast -- were compared with regard to their dependence upon inducing-grating spatial frequency. Both effects cause the contrast of target stimuli embedded in surrounding patterns to be matched nonveridically. The magnitudes of each effect were measured in a common unit that indexed the degree of nonveridical contrast matching across a large range of target-grating contrasts (± 0.80). Grating induction was a low-pass effect with respect to spatial frequency, whereas contrast - contrast was bandpass, peaking at approximately 4.0 cycles deg-1. The magnitude of grating induction exceeded that of contrast - contrast, both overall and at their optimal frequencies (0.03125 and 4.0 cycles deg-1, respectively); the two effects are equipotent at an inducing-grating spatial frequency of 1.0 cycle deg-1. A significant negative correlation between the magnitudes of the two effects suggests a link whereby activation of second-order normalization mechanisms may inhibit first-order mechanisms.
Full-text PDF size: 352 Kb
References 26 references, 20 with DOI links ()
Your computer (IP address: 188.8.131.52) has not been recognised as being on a network authorised to view the full text or references of this article. If you are a member of a university library that has a subscription to the journal, please contact your serials librarian (subscriptions information).