The lemon illusion: seeing curvature where there is none

The lemon illusion: seeing curvature where there is none

Curvature is a highly informative visual cue for shape perception and object recognition. We introduce a novel illusion-the Lemon Illusion-in which subtle illusory curvature is perceived along contour regions that are devoid of physical curvature. We offer several perceptual demonstrations and observations that lead us to conclude that the Lemon Illusion is an instance of a more general illusor...

Where there is smoke, there is fire.

The ankle-brachial index (ABI), a ratio of systolic blood pressure measured at the ankle and the brachial artery, is a simple noninvasive screening test used to diagnose peripheral arterial disease (PAD). PAD affects over 12 million people in the United States and its prevalence increases with increasing age (1,2). Patients with an abnormal ABI, defined as 0.90 or 1.40, are at increased risk of...

Recalling what was where when seeing nothing there

So-called "looks-at-nothing" have previously been used to show that recalling what also elicits the recall of where this was. Here, we present evidence from an eye-tracking study which shows that disrupting looks to "there" does not disrupt recalling what was there, nor do (anticipatory) looks to "there" facilitate recalling what was there. Therefore, our results suggest that recalling where do...

Where there is a will there is a way

Peritonitis was a significant problem for our peritoneal dialysis patients in 2003. In January 2004, we initiated a continuous quality improvement project to address the problem. Our project took 18 months to complete. We developed many action items. Our first step was to analyze the data to ensure accuracy, and also to determine the causative organism that contributed most to the problem. The ...

Where there is no overlap, there is a gap.