کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
410652 679154 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Integrating contrast invariance into a model for cortical orientation map formation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر هوش مصنوعی
پیش نمایش صفحه اول مقاله
Integrating contrast invariance into a model for cortical orientation map formation
چکیده انگلیسی

Hebbian models of orientation map formation in the primary visual cortex typically represent the cortex as an array of neurons that are excited by both ON and OFF lateral geniculate nucleus neurons. However, simple cells with only thalamic excitation exhibit tuning curves that widen with stimulus contrast. This is inconsistent with the contrast-invariant width actually observed. We propose a map formation model that achieves contrast invariance through anti-phase inhibition. We describe how inhibition between columns implements the coverage constraint to ensure orientations are uniformly sampled. We find that the model exhibits more robust receptive field formation than a simpler model without anti-phase inhibition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neurocomputing - Volume 72, Issues 7–9, March 2009, Pages 1887–1899
نویسندگان
, ,