• A
  • A
  • A
  • АБВ
  • АБВ
  • АБВ
  • А
  • А
  • А
  • А
  • А
Обычная версия сайта

Новости

В лаборатории когнитивной психофизиологии опубликована статья в высокорейтинговом журнале по результатам совместной работы с МЭГ-центром

По материалам исследований лаборатории когнитивной психофизилогии совместно с МЭГ-центром МГППУ в марте 2016 г. опубликована статья в журнале Visual Neuroscience

По материалам исследований лаборатории когнитивной психофизилогии совместно с МЭГ-центром МГППУ в марте 2016 г. опубликована статья
B.V. Chernyshev, P.K. Pronko, T. A. Stroganova. Early suppression effect in human primary visual cortex during Kanizsa illusion processing: a magnetoencephalographic evidence // Visual Neuroscience, 2016, 33, e007
doi:10.1017/S0952523816000031

http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=10245081&fulltextType=RA&fileId=S0952523816000031


Аннотация статьи:
Detection of illusory contours (ICs) such as Kanizsa figures is known to depend primarily upon the lateral occipital  complex. Yet there is no universal agreement on the role of the primary visual cortex in this process; some existing  evidence hints that an early stage of the visual response in V1 may involve relative suppression to Kanizsa figures  compared with controls. Iso-oriented luminance borders, which are responsible for Kanizsa illusion, may evoke surround  suppression in V1 and adjacent areas leading to the reduction in the initial response to Kanizsa figures. We attempted to  test the existence, as well as to fi nd localization and timing of the early suppression effect produced by Kanizsa figures in  adult nonclinical human participants. We used two sizes of visual stimuli (4.5 and 9.0°) in order to probe the effect at two  different levels of eccentricity; the stimuli were presented centrally in passive viewing conditions. We recorded magnetoencephalogram, which is more sensitive than electroencephalogram to activity originating from V1 and V2 areas.  We restricted our analysis to the medial occipital area and the occipital pole, and to a 40–120 ms time window after the  stimulus onset. By applying threshold-free cluster enhancement technique in combination with permutation statistics, we  were able to detect the inverted IC effect—a relative suppression of the response to the Kanizsa figures compared with the  control stimuli. The current finding is highly compatible with the explanation involving surround suppression evoked by  iso-oriented collinear borders. The effect may be related to the principle of sparse coding, according to which V1  suppresses representations of inner parts of collinear assemblies as being informationally redundant. Such a mechanism is  likely to be an important preliminary step preceding object contour detection. 

Keywords:  Illusory  contour,  Primary  visual  cortex,  Surround  suppression,  Magnetoencephalography

Полный текст может быть выслан по запросу авторам.