scholarly journals Motion adaptation shifts apparent position without the motion aftereffect

2003 ◽  
Vol 65 (7) ◽  
pp. 1011-1018 ◽  
Author(s):  
David Whitney ◽  
Patrick Cavanagh
Keyword(s):  
Motion Aftereffect ◽  
Motion Adaptation ◽  
Apparent Position

scholarly journals Spatiotopic perceptual maps in humans: evidence from motion adaptation

2012 ◽  
Vol 279 (1740) ◽  
pp. 3091-3097 ◽  
Author(s):  
Marco Turi ◽  
David Burr
Keyword(s):  
Eye Movements ◽  
Perceptual Experience ◽  
Motion Aftereffect ◽  
Image Motion ◽  
Motion Adaptation ◽  
Apparent Position ◽  
Moving Source ◽  
Perceptual Maps ◽  
The World

How our perceptual experience of the world remains stable and continuous despite the frequent repositioning eye movements remains very much a mystery. One possibility is that our brain actively constructs a spatiotopic representation of the world, which is anchored in external—or at least head-centred—coordinates. In this study, we show that the positional motion aftereffect (the change in apparent position after adaptation to motion) is spatially selective in external rather than retinal coordinates, whereas the classic motion aftereffect (the illusion of motion after prolonged inspection of a moving source) is selective in retinotopic coordinates. The results provide clear evidence for a spatiotopic map in humans: one which can be influenced by image motion.

Local and Global Properties of Motion Aftereffects

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 170-170
Author(s):  
N J Wade ◽  
V Pardieu ◽  
M T Swanston
Keyword(s):  
Vision Research ◽  
Motion Aftereffect ◽  
Test Display ◽  
Adaptation Process ◽  
Local Motion ◽  
Motion Adaptation ◽  
Global Properties ◽  
Differential Adaptation ◽  
Induced Motion ◽  
Motion Aftereffects

The local motion adaptation at the basis of the motion aftereffect (MAE) can be expressed in a variety of ways, depending upon the structure of the test display (N J Wade, L Spillmann, M T Swanston Vision Research in press). This has been demonstrated with MAEs from induced motion: if adaptation is to two moving (Surround) gratings, an MAE is seen in the central grating if two gratings surround it, but in the flanking gratings when they are themselves surrounded in the test stimulus. We report two experiments in which the characteristics of the test display and of the local adaptation process have been examined. In experiment 1, five vertical gratings were presented during adaptation; the outermost and central gratings remained stationary and those flanking the centre moved laterally. The test display always consisted of three stationary gratings: either the central three or the lower three equivalent to the locations of the adaptation display. MAEs were only recorded in the Centre and not in the Surround, irrespective of whether the Centre or Surround had been exposed to motion during adaptation. MAEs in the Centre were in opposite directions, reflecting the influence of Surround adaptation. The influence of adapting motion in different directions was examined in experiment 2. The upper grating always received the same direction of motion during adaptation, and the lower grating was absent, stationary, or moving in the same or in the opposite direction. The results indicate that an MAE is visible in the upper grating only after differential adaptation between the upper and lower gratings.

scholarly journals Illusory Increases in Font Size Improve Letter Recognition

2017 ◽  
Vol 28 (8) ◽  
pp. 1180-1188 ◽  
Author(s):  
Martin Lages ◽  
Stephanie C. Boyle ◽  
Rob Jenkins
Keyword(s):  
Visual Acuity ◽  
Visual Stimulus ◽  
Motion Aftereffect ◽  
Letter Recognition ◽  
Visual Performance ◽  
Cortical Processing ◽  
Font Size ◽  
Motion Adaptation ◽  
Sensory Encoding

Visual performance of human observers depends not only on the optics of the eye and early sensory encoding but also on subsequent cortical processing and representations. In two experiments, we demonstrated that motion adaptation can enhance as well as impair visual acuity. Observers who experienced an expanding motion aftereffect exhibited improved letter recognition, whereas observers who experienced a contracting motion aftereffect showed impaired letter recognition. We conclude that illusory enlargement and shrinkage of a visual stimulus can modulate visual acuity.

scholarly journals A new form of motion aftereffect in transparent motion adaptation

2011 ◽  
Vol 11 (11) ◽  
pp. 702-702
Author(s):  
A. L. F. Lee ◽  
H. Lu
Keyword(s):  
Motion Aftereffect ◽  
Motion Adaptation ◽  
Transparent Motion ◽  
New Form

scholarly journals The dynamic motion aftereffect is driven by local motion adaptation

2010 ◽  
Vol 5 (8) ◽  
pp. 149-149
Author(s):  
W. Curran ◽  
C. P. Benton
Keyword(s):  
Motion Aftereffect ◽  
Local Motion ◽  
Motion Adaptation ◽  
Dynamic Motion

scholarly journals Attention and the motion aftereffect

2019 ◽  
Vol 72 (12) ◽  
pp. 2848-2864 ◽  
Author(s):  
Michael J Morgan ◽  
Joshua A Solomon
Keyword(s):  
Time Course ◽  
Reaction Times ◽  
Motion Aftereffect ◽  
Movement Direction ◽  
Search Performance ◽  
Motion Adaptation ◽  
Test Array ◽  
Percent Correct ◽  
Search Speed ◽  
The One

We measured the effects of attentional distraction on the time course and asymptote of motion adaptation strength, using visual search performance (percent correct and reaction time). In the first two experiments, participants adapted to a spatial array of moving Gabor patches, either all vertically oriented (Experiment 1) or randomly oriented (Experiment 2). On each trial, the adapting array was followed by a test array in which all of the test patches except one were identical in orientation and movement direction to their retinotopically corresponding adaptors, but the target moved in the opposite direction to its adaptor. Participants were required to identify the location of the changed target with a mouse click. The ability to do so increased with the number of adapting trials. Neither search speed nor accuracy was affected by an attentionally demanding conjunction task at the fixation point during adaptation, suggesting low-level (preattentive) sites in the visual pathway for the adaptation. In Experiment 3, the same participants were required to identify the one element in the test array that was slowly moving. Reaction times in this case were elevated following adaptation, but once again there was no significant effect of the distracting task upon performance. In Experiment 4, participants were required to make eye movements, so that retinotopically corresponding adaptors could be distinguished from spatiotopically corresponding adaptors. Performance in Experiments 1 and 2 correlated positively with reaction times in Experiment 3, suggesting a general trait for adaptation strength.

scholarly journals A motion aftereffect from viewing other people’s gaze

2020 ◽  
Author(s):  
William Randall ◽  
Arvid Guterstam
Keyword(s):  
Social Cognition ◽  
Recent Work ◽  
Motion Aftereffect ◽  
Object Motion ◽  
Decision Threshold ◽  
Motion Adaptation ◽  
Directional Motion ◽  
Static Images ◽  
Subsequent Motion ◽  
Motion Aftereffects

SummaryRecent work suggests that our brains may generate subtle, false motion signals streaming from other people to the objects of their attention, aiding social cognition. For instance, brief exposure to static images depicting other people gazing at objects made subjects slower at detecting subsequent motion in the direction of gaze, suggesting that looking at someone else’s gaze caused a directional motion adaptation. Here we confirm, using a more stringent method, that viewing static images of another person gazing in a particular direction, at an object, produced motion aftereffects in the opposite direction. The aftereffect was manifested as a change in perceptual decision threshold for detecting left versus right motion. The effect disappeared when the person was looking away from the object. These findings suggest that the attentive gaze of others is encoded as an implied agent-to-object motion that is sufficiently robust to cause genuine motion aftereffects, though subtle enough to remain subthreshold.

PATHS OF SEEN MOTION AND MOTION AFTEREFFECT

1966 ◽  
Vol 23 (3) ◽  
pp. 1003-1008 ◽  
Author(s):  
SHIGEMASA SUMI
Keyword(s):  
Motion Aftereffect
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