Non-linear global pooling in the discrimination of circular and non-circular shapes

Gunnar Schmidtmann, Graeme Kennedy, Harry Orbach, Gunter Loffler

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


The ability to discriminate minute deviations from circularity is dependent upon global summation mechanisms integrating information along entire contours. The aim of this study was to determine how the strength of global summation depends on various stimulus features. To determine if the strength of global summation differs between shapes, contour discrimination for various contour shapes, generated by applying a sinusoidal modulation to the radius of a circle (radial frequency – RF – patterns), was measured.
Original languageEnglish
Pages (from-to)44-56
Number of pages12
JournalVision Research
Issue number1
Publication statusPublished - Jun 2012


  • shape perception
  • form vision
  • contour
  • vision sciences

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