Abstract:
:The detection of small radially symmetric targets was studied using a subthreshold summation paradigm. Small disc and disc-like patterns with diameters up to 0.60 were used for superposition on Bessel functions of zero order, subthreshold contrast and various spatial frequencies. Contrast interrelation functions prove linear over the whole range of contrasts used for the Bessel functions while their slopes show systematic variation with spatial frequency. An extrapolation of sensitivity from the slopes reveals that sensitivity can be predicted by a simple model assuming detection to be mediated by a transfer function made up as a cascade of an even bandpass function and the disc pattern spectrum, as has been found previously using one dimensional luminance distributions. Problems concerning the formation of pattern-specific radial symmetric filters are discussed.
journal_name
Biol Cybernjournal_title
Biological cyberneticsauthors
Mortensen U,Meinhardt Gdoi
10.1007/s004220170005keywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
63-74issue
1eissn
0340-1200issn
1432-0770journal_volume
84pub_type
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