Basics of seeing motion

Basics of seeing motion

Seeing Motion and Apparent Motion

In apparent motion experiments, participants are presented with what is in fact a succession of two brief stationary stimuli at two different locations, but they report an impression of movement. Philosophers have recently debated whether apparent motion provides evidence in favour of a particular account of the nature of temporal experience. I argue that the existing discussion in this area is...

Visual Cortex: Seeing Motion

What happens in primary visual cortex (V1) when we look at a complex moving image? While motion responses have been investigated thoroughly at the level of single neurons [1–4], studies of motion representation at the level of maps have been restricted to stimuli composed of long bars. These stimuli are inherently ambiguous as to their direction of motion [1]. A recent study by Fitzpatrick and ...

Seeing blur: 'motion sharpening' without motion.

It is widely supposed that things tend to look blurred when they are moving fast. Previous work has shown that this is true for sharp edges but, paradoxically, blurred edges look sharper when they are moving than when stationary. This is 'motion sharpening'. We show that blurred edges also look up to 50% sharper when they are presented briefly (8-24 ms) than at longer durations (100-500 ms) wit...

Seeing liquids from visual motion

Most research on human visual recognition focuses on solid objects, whose identity is defined primarily by shape. In daily life, however, we often encounter materials that have no specific form, including liquids whose shape changes dynamically over time. Here we show that human observers can recognize liquids and their viscosities solely from image motion information. Using a two-dimensional a...