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What does ASA stand for?

ASA stands for apparent straight-ahead

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Relationshipof induced motion and apparent straight-ahead shifts to optokinetic stimulus velocity. Perception and Psychophysics (1990) by R B Post, L A Lott.
Induced motion (IM) of a fixation target and the location of the apparent straight ahead (ASA) were measured during and after 2 min of exposure to a moving contoured background. The magnitude of IM increased to an asymptotic level during the exposure period. Following termination of moving contours, illusory motion of the fixation target occurred first in the same direction and then in the direction opposite to that of previous IM.
[Show abstract] [Hide abstract] ABSTRACT: Induced motion (IM) of a fixated spot stimulus and shifts of the apparent straight-ahead (ASA) from the objective median plane were studied as a function of the velocity of a full-field optokinetic background stimulus. Both IM and ASA were influenced similarly by changes in stimulus velocity. The magnitude of both responses, averaged across subjects, increased to a peak level with background velocities of 40-80 deg/sec and decreased at higher velocities.
Previous reports (Becklen& Wallach, 1985;Wallach & Becklin, 1983) have suggested that 1Melicitedwith a large inducing stimulus declines with increased in-ducer velocity. This interpretation was questionedby Post,Chi, Heckmann, and Chaderjian (1989), who noted thatan oscillating inducing stimulus had been used in suchstudies, thereby confounding the variable of stimulus ve-locity with duration of stimulus motion. In the presentexperiment, the optokinetic inducing stimulus did not os-cillate, so the effects of velocity were examined indepen-dently of duration. With the factor of stimulus durationcontrolled, the present study demonstrates that 1M per-10 20 40 80160RIGHTWARD STIMULUSFigure 3. Data from Figure 2 transposed to express the magnitude of induced-motion and apparent-straight-ahead.
Induced motion (IM) of a fixated spot stimulus and shifts of the apparent straight-ahead (ASA) from the objective median plane were studied as a function of the velocity of a full-field optokinetic background stimulus. Both IM and ASA were influenced similarly by changes in stimulus velocity. The magnitude of both responses, averaged across subjects, increased to a peak level with background velocities of 40-80 deg/sec and decreased at higher velocities.