Meta- and paracontrast reveal differences between contour- and brightness-processing mechanisms

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Breitmeyer B. G., Kafaligonul H. H., Ogmen H., Mardon L., Todd S., Ziegler R.

VISION RESEARCH, cilt.46, sa.17, ss.2645-2658, 2006 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 17
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.visres.2005.10.020
  • Dergi Adı: VISION RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2645-2658
  • Gazi Üniversitesi Adresli: Hayır

Özet

We investigated meta- and paracontrast masking using tasks requiring observers to judge the surface brightness or else the contours of target stimuli. The contour task revealed strongest metacontrast at SOAs shorter than those obtained for the brightness task. Paracontrast revealed related temporal differences between the tasks. Additionally, the paracontrast results support the existence not only of prolonged inhibitory effects but also of facilitatory effects. The combined results comport with the existence of cortical mechanisms for: (i) fast contour processing, (ii) slow surface-brightness processing. (iii) prolonged inhibition, and (iv) facilitation. (c) 2005 Elsevier Ltd. All rights reserved.