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Regarding baseballs, the problem is that the fovea can focus on only a very small area only about 2 degrees of the visual field (or an area smaller than your thumbnail held at arm's length)—so as a pitched ball moves closer it can easily slip into your peripheral vision as it becomes larger.
Humphrey static perimetry revealed a severe decrease in sensitivity within the central 30 degrees of the visual field in both eyes (Fig. 1A).
These 'small target motion detectors' (STMDs) were found to be exquisitely selective for small targets subtending no more than a few degrees of the visual field, equivalent to just one or two 'pixels' of the compound eye.
The centering fixation stimuli were composed of brightly-colored moving abstract figures and subtended 5 degrees of the visual angle.
Importantly, however, the type and extent (in degrees) of the visual perturbations were the same for both imaging modalities.
Targets were in one of the 19 areas within the central 30 degrees of the visual field.
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A sequence of stationary images which induce AM can be presented over a short-range (less than a degree of the visual field) or over a longer range (several degrees).
In analyzing the response of the eye to a visual image, we usually express the dimensions of the image in degrees of visual angle: the angle subtended by a triangle with one vertex at the eye and the other two enclosing the object.
The height of each figure subtended 2 degrees of visual angle, the width varied (with the motion of the arm and leg joints) from 0.9 1.5 degrees.
This time can be particularly tough on women, who, as it turns out, represent the majority of graduates holding degrees in the visual, performing and literary arts.
However, this study only provides a limited assessment of the dependence of perceptual grouping from the properties of the groping cues, mainly because it lacks in control over important stimulus properties, such as the size and separation, in degrees of visual angle, of the constituent elements of the stimulus arrays.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com