Download The Motion Aftereffect: A Modern Perspective by George Mather, Frans Verstraten, Stuart Anstis PDF

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By George Mather, Frans Verstraten, Stuart Anstis

Motion conception lies on the middle of the clinical learn of imaginative and prescient. The movement aftereffect (MAE), most likely the simplest identified phenomenon within the learn of visible illusions, is the looks of directional move in a desk bound item or scene after the viewer has been uncovered to visible movement within the other way. for instance, after one has checked out a waterfall for a time period, the scene beside the waterfall might sound to maneuver upward whilst ones gaze is transferred to it. even though the phenomenon turns out uncomplicated, learn has printed miraculous complexities within the underlying mechanisms, and provided common classes approximately how the mind strategies visible details. within the final decade by myself, greater than two hundred papers were released on MAE, principally encouraged via more suitable concepts for studying mind electrophysiology and via rising new theories of movement conception. The members to this quantity are all lively researchers who've helped to form the trendy notion of MAE.

Contributors: David Alais, Stuart Anstis, Patrick Cavanagh, Jody Culham, John Harris, Michelle Kwas, Timothy Ledgeway, George Mather, Bernard Moulden, Michael Niedeggen, Shin'ya Nishida, Allan Pantle, Robert Patterson, Jane Raymond, Michael Swanston, Peter Thompson, Frans Verstraten, Michael von Grunau, Nicolas Wade, Eugene Wist.

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Additional resources for The Motion Aftereffect: A Modern Perspective

Example text

Early measuresof MAE magnitude or strength took a number of forms. One procedure for measuring the strength or magnitude of an MAE which has never been widely adopted is a matching With this procedure used primarily to estimate the speedof an MAE . 28 Allan Pantie procedure an observer would adjust a real seenmotion or make a motor movement of some type to match the speed of an MAE . The matching procedure is a difficult one to use becausethe speedof M A Es is slow and becausethe matching motion necessarilyinvolves a change of position whereasthe MAE does not.

1994a] that MAE duration is a better predictor of the MAE of transparent motion than directional " sensitivity does not hold . . (p . 80 ). To a Arst approximation the vector addition model , with components normalized by threshold sensitivity or by duration of MAE induction , provides a reasonable At to data in the Arst few studies of M A Es generated by adapting stimuli with more than one direction or speed component . , 1976 ). Undoubtedly , measures of integration will remain an important tool for the discovery of mechanisms underlying M A Es.

Then the amount by which the phasehas to be increasedor decreased&om 180 degreesin order to make the test stimulus appearstationary (or to move as much in one direction as the other) constitutes a measure of MAE strength (McCarthy , 1993). , McCarthy , 1993; Nishida and Sato, 1995; Ashida and Osaka, 1995b). Theoretically, one solution has been to suggest that the different test stimuli tap different adaptation processes. The role of multiple sites and pathways in the generation of M A Es and the manner in which the new nulling measuresbear on this problem is the secondmajor topic discussedin this chapter.

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