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Particpant ID: 15 (only temporally unstable perceptions are shown)
[ show static and animated ]

a) ~ 1Hz (see note; see very high resolution)
c) ~ 2.5 Hz
d) ~ 2.5 Hz (see note)

Click on the images to see a higher resolution version (for computer monitors).

NOTE: For stimulus a) in addition to contrast variation, the participant reported a movement of jagged edges of the grid. These are visible well in the original high-resolution file (linked).

NOTE: For stimulus d) the participant reported pulsating wavy edges of the black grid lines; these are visible only on the high resolution image, not on the thumbnail.

This work was supported by grants from the Deutsche Forschungsgemeinschaft to R. Sireteanu (SI 344/17-2,3) and partly from Romanian CNCSIS to A.Iftime (TD-48/2008)