The abutting grating illusion

The abutting grating illusion

Two line gratings abutting each other with a phase shift of half a cycle elicit the perception of an illusory line running orthogonally between the two sets of grating lines. We found that rating strength increases with increasing number of lines, line length, and phase angle. In contrast, rating strength decreases with increasing spacing of lines, lateral misalignment, rotation of one grating ...

The novelty of the "Accordion Grating Illusion"

The Drifting Edge Illusion: A stationary edge abutting an oriented drifting grating appears to move because of the ‘other aperture problem’

We describe the Drifting Edge Illusion (DEI), in which a stationary edge appears to move when it abuts a drifting grating. Although a single edge is sufficient to perceive DEI, a particularly compelling version of DEI occurs when a drifting grating is viewed through an oriented and stationary aperture. The magnitude of the illusion depends crucially on the orientations of the grating and apertu...

The vertical-horizontal illusion: assessing the contributions of anisotropy, abutting, and crossing to the misperception of simple line stimuli.

Mamassian and de Montalembert (2010) have proposed a simple model of the vertical-horizontal illusion. This model identified two components, an anisotropy which results in horizontal lines being perceived approximately 6% shorter than verticals and a bisection component which results in a bisected line being perceived approximately 16% shorter. We have shown that this bisection component confou...

Ingested bony foreign body abutting thoracic aorta.

The authors present the case of a 38-year-old female who presented with an ingested oesophageal foreign body (lamb bone) following consumption of a casserole. The bone was initially not seen on plain x-ray but CT imaging revealed a 21×20 mm pyramid shaped bone distending the proximal oesophageal mucosa and lodged only 2 mm from the aortic arch. Cardiothoracic surgery services were available on ...