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. Author manuscript; available in PMC: 2006 Oct 10.
Published in final edited form as: Nat Neurosci. 2005 Aug 7;8(9):1248–1254. doi: 10.1038/nn1518

Figure 1.

Figure 1

Experimental design and stimuli. Subjects viewed letters at central fixation and oscillating sine-wave gratings in the upper and lower left visual field, separated by a 7° gap. Subjects attended to the identity of the letters or to brief decrements in the contrast of the peripheral gratings. (a) Phantom condition: Vertically aligned gratings led to strong impressions of a phantom grating extending through the blank gap region. A weaker impression of a phantom may be observed here with static gratings. (b) Control condition: Horizontal gratings appeared to move as a perceptual group but failed to lead to an impression of a phantom. (c) Retinotopic regions of interest in areas V1–V4 corresponding to the location of the blank gap (red) and surrounding gratings (blue), shown on the cortical flatmap of a representative subject. Regions were identified in separate scans using flickering checkerboards, and aligned to retinotopic maps collected from the same subject.