کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4033774 1603206 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Contextual influences in texture-segmentation: Distinct effects from elements along the edge and in the texture-region
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Contextual influences in texture-segmentation: Distinct effects from elements along the edge and in the texture-region
چکیده انگلیسی


• We investigated contextual influences on texture-edge discrimination.
• Both iso-near and ortho-far contextual effects are reported.
• The iso-near effect relies on 2nd order filters enhancement and feedback processes.
• Recurrent interactions among 1st order filters explain the ortho-far effect.

Both neurophysiological and psychophysical evidence suggest a strong influence of context on texture-segmentation. Here we extend and further analyse this issue, with a particular focus on the underlying mechanism. Specifically, we use a texture-edge discrimination task and separately investigate the effect of elements far from and along the edge. Consistent with previous studies, we report both an iso-near contextual effect – whereby performance is better if elements along the edge are iso-oriented compared to ortho-oriented to the edge – as well as an ortho-far effect – whereby discrimination is higher when elements far from the edge are orthogonal to the edge. We found that backward mask, which is known to interrupt re-entrant processing from extrastriate areas, only interferes with the iso-near effect whereas perturbing orientation, position or contrast polarity of elements far from the edge only abolishes the ortho-far effect. This suggests that feedback processes may be involved in the iso-near effect. Instead, the ortho-far effect may be accounted for by recurrent interactions among 1st order filters.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 88, 9 August 2013, Pages 1–8
نویسندگان
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