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Paper   IPM / Cognitive Sciences / 7496
School of Cognitive Sciences
  Title:   Disappearance patterns of coloured gratings and illusory contours in motion-induced blindness
  Author(s):  L. Montaser kouhsari
  Status:   In Proceedings
  Proceeding: ECVP
  Year:  2003
  Supported by:  IPM
  Abstract:
When a global moving pattern is superimposed on high-contrast stationary stimuli, the latter occasionally disappear for periods of several seconds [motion-induced blindness (MIB)]. When two adjacent collinear Gabor patches are presented, they disappear and reappear simultaneously, but when two orthogonal Gabor patches are presented, their disappearances are independent (Bonneh et al, 2001 Nature 411 798 - 801). In this study, the pattern of disappearance for coloured gratings and illusory contours in MIB setup was investigated. In the first experiment, two collinear or orthogonal grating patches with the same or different colours were presented to the observers and they were asked to report the duration of simultaneous and sequential disappearance of the grating patches. The duration of simultaneous disappearance was significantly higher than that of sequential disappearance when both attributes (colour and orientation) were the same and significantly less when at least one attribute was different. In the second experiment, two illusory contours were presented in an MIB setup. The stimuli were two patches that contained an oriented illusory line induced by two line gratings abutting each other with a phase shift. The orientations of real grating lines and illusory lines of the two stimuli were either same or different. The duration of simultaneous disappearance was significantly higher than sequential disappearance when both attributes (real line orientation and illusory line orientation) were the same, and significantly less when real line orientation or both attributes were different. These results show that similarity of attributes other than orientation leads the stimuli to disappear simultaneously in the MIB setup.


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