Abstract:
:David Marr and others have hypothesized that the visual system processes complex scene information in stages, the first of which involves the detection of light intensity edges or "zero-crossings" (Marr, 1982). Ideal zero-crossing detector mechanisms have been described and modeled in terms of their possible physiological implementation (Marr and Hildreth, 1980; Poggio, 1983). We now present evidence of visual cortical receptive fields which resemble in spatial organizational terms the requirements of zero-crossing analysis. The linear and nonlinear summation within and between the receptive field subunits are described and compared with predicted processes. The relative subunit sizes and separations are analyzed in these terms. Our findings support the notion that receptive fields may correspond with zero-crossing filters rather than zero-crossing detector gates.
journal_name
Biol Cybernjournal_title
Biological cyberneticsauthors
Hochstein S,Spitzer Hdoi
10.1007/BF00346140subject
Has Abstractpub_date
1984-01-01 00:00:00pages
195-9issue
3eissn
0340-1200issn
1432-0770journal_volume
51pub_type
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