کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6203811 1263451 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shape contrast: A global mechanism?
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Shape contrast: A global mechanism?
چکیده انگلیسی

We investigated whether a shape contrast bias is caused by local contrast enhancement or by a global mechanism. In a baseline condition, observers performed a shape discrimination task on an isolated hinged plane. But in the experimental conditions, five dihedral surfaces, of which we varied the dihedral angle distribution, were added on each side. Shape perception was influenced not only by the adjacent surface but also by the mean of the shape distribution in the extended surround. Thus, shape contrast is not locally determined and has to be understood from a global mechanism. We propose divisive normalization of shape signals as such a mechanism.

Research highlights► Shape contrast is affected by global shape properties. ► Heterogeneity of shape information does not influence a shape contrast bias. ► The mechanism of shape contrast has to take global shape properties into account.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 50, Issue 23, 23 November 2010, Pages 2455-2459
نویسندگان
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