The perception of a target stimulus may be altered by its context. Perceptual filling-in is
thought to be one example of lateral modulation, in which the percept of a central blank area …

Center-surround modulation in visual processing reflects a normalization process of contrast
gain control in the responsive neurons. Prior adaptation to a clockwise (CW) tilted grating …

The tilt illusion is a compelling example of contextual influence exerted by an oriented
surround on a target's perceived orientation. A vertical target appears to be tilted away from …

The perceived orientation of a Gabor-patch contour is determined, in part, by shifts in carrier
phase between the patches [Popple, AV & Sagi, D., 2000. A Fraser illusion without local …

Outside the fovea, the visual system both accentuates and obscures the differences between
adjacent visual stimuli. We adapted Freeman, Sagi & Driver's (2001) dual-task paradigm to …

Visibility of a central target Gabor element often improves in the presence of collinear
flankers. Such lateral interactions may reflect fundamental mechanisms underlying the …

The human visual system exaggerates the difference between the tilts of adjacent lines or
grating patches. In addition to this tilt illusion, we found that oblique flanks reduced acuity for …

The detectability of a Gabor patch (target) in the fovea is improved by two high contrast,
aligned, flanking Gabor patches (flankers). This effect is termed collinear facilitation (Polat & …

Contextual effects abound in vision. The tilt illusion (TI) is an example—a tilted surrounding
annulus causes a vertical central pattern to appear rotated away from the surround. We …

Four experiments were performed to investigate how the time required for perceptual filling-
in varies with the position of the target in the visual field. Conventional studies have revealed …