Smooth Pursuit in The Absence of A Visual Target
Performing smooth pursuit without a moving visual stimulus is difficult, and typically results in a series of saccades. However, pursuit without a visible target is possible under some particular conditions, that show the importance of high-level functions in smooth pursuit maintenance. If you know which way a target will move, or know the target trajectory (because it is periodic for instance), you can initiate pursuit before the target motion actually starts, especially if you know exactly when the motion will start. It is also possible to maintain pursuit if a target momentarily disappears, especially if the target appears to be occluded by a larger object. Under conditions in which there is no visual stimulation (in total darkness), we can still perform smooth pursuit eye movements with the help of a proprioceptive motion signal (e.g. your moving finger).
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Famous quotes containing the words smooth, pursuit, absence, visual and/or target:
“Yet I’ll not shed her blood,
Nor scar that whiter skin of hers than snow,
And smooth as monumental alabaster.”
—William Shakespeare (1564–1616)
“The pursuit of happiness, which American citizens are obliged to undertake, tends to involve them in trying to perpetuate the moods, tastes and aptitudes of youth.”
—Malcolm Muggeridge (1903–1990)
“Baseball is the religion that worships the obvious and gives thanks that things are exactly as they seem. Instead of celebrating mysteries, baseball rejoices in the absence of mysteries and trusts that, if we watch what is laid before our eyes, down to the last detail, we will cultivate the gift of seeing things as they really are.”
—Thomas Boswell, U.S. sports journalist. “The Church of Baseball,” Baseball: An Illustrated History, ed. Geoffrey C. Ward, Knopf (1994)
“Unlike any other visual image, a photograph is not a rendering, an imitation or an interpretation of its subject, but actually a trace of it. No painting or drawing, however naturalist, belongs to its subject in the way that a photograph does.”
—John Berger (b. 1926)
“But this we know, the obstacle that checked
And tripped the body, shot the spirit on
Further than target ever showed or shone.”
—Robert Frost (1874–1963)