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

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 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 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.

A Transparent Motion Aftereffect Contingent on Binocular Disparity

Perception ◽  
1994 ◽  
Vol 23 (10) ◽  
pp. 1181-1188 ◽  
Author(s):  
Frans A J Verstraten ◽  
Reinder Verlinde ◽  
R Eric Fredericksen ◽  
Wim A van de Grind
Keyword(s):  
Binocular Disparity ◽  
Motion Aftereffect ◽  
Stimulus Configuration ◽  
Retinal Disparity ◽  
Transparent Motion ◽  
Stationary Test ◽  
Vector Sum ◽  
Moving Patterns

Under transparent motion conditions overlapping surfaces are perceived simultaneously, each with its own direction. The motion aftereffect (MAE) of transparent motion, however, is unidirectional and its direction is opposite to that of a sensitivity-weighted vector sum of both inducing vectors. Here we report a bidirectional and transparent MAE contingent on binocular disparity. Depth (from retinal disparity) was introduced between two patterns. A fixation dot was presented at zero disparity, that is, located between the two adaptation patterns. After adaptation to such a stimulus configuration testing was carried out with two stationary test patterns at the same depths as the preceding moving patterns. For opposite directions a clear transparent MAE was perceived. However, if the adaptation directions were orthogonal the chance of a transparent MAE being perceived decreased substantially. This was subject dependent. Some subjects perceived an orthogonal transparent MAE whereas others saw the negative vector sum—an integrated MAE. In addition the behaviour of the MAE when the distance in depth between adapting and test patterns was increased was investigated: it was found that the visibility of the MAE then decreased. Visibility is defined in this paper as: (i) the percentage of the trials in which MAEs are perceived and (ii) the average MAE duration. Both measures decreased with increasing distance. The results suggest that segregation and integration may be mediated by direction-tuned channels that interact with disparity-tuned channels.

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 The motion aftereffect of transparent motion: Two temporal channels account for perceived direction

2005 ◽  
Vol 45 (4) ◽  
pp. 403-412 ◽  
Author(s):  
David Alais ◽  
Frans A.J. Verstraten ◽  
David C. Burr
Keyword(s):  
Motion Aftereffect ◽  
Transparent Motion
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