scholarly journals Test stimulus characteristics determine the perceived speed of the dynamic motion aftereffect

2006 ◽  
Vol 46 (19) ◽  
pp. 3284-3290 ◽  
Author(s):  
William Curran ◽  
Christopher P. Benton
Keyword(s):  
Test Stimulus ◽  
Motion Aftereffect ◽  
Dynamic Motion ◽  
Perceived Speed

scholarly journals The tactile motion aftereffect suggests an intensive code for speed in neurons sensitive to both speed and direction of motion

2016 ◽  
Vol 115 (3) ◽  
pp. 1703-1712 ◽  
Author(s):  
S. McIntyre ◽  
I. Birznieks ◽  
R. M. Vickery ◽  
A. O. Holcombe ◽  
T. Seizova-Cajic
Keyword(s):  
Test Stimulus ◽  
Dynamic Test ◽  
Human Perception ◽  
Motion Aftereffect ◽  
Object Motion ◽  
Motion Processing ◽  
Motion Direction ◽  
Test Speed ◽  
Neurophysiological Studies ◽  
Tactile Motion Aftereffect

Neurophysiological studies in primates have found that direction-sensitive neurons in the primary somatosensory cortex (SI) generally increase their response rate with increasing speed of object motion across the skin and show little evidence of speed tuning. We employed psychophysics to determine whether human perception of motion direction could be explained by features of such neurons and whether evidence can be found for a speed-tuned process. After adaptation to motion across the skin, a subsequently presented dynamic test stimulus yields an impression of motion in the opposite direction. We measured the strength of this tactile motion aftereffect (tMAE) induced with different combinations of adapting and test speeds. Distal-to-proximal or proximal-to-distal adapting motion was applied to participants' index fingers using a tactile array, after which participants reported the perceived direction of a bidirectional test stimulus. An intensive code for speed, like that observed in SI neurons, predicts greater adaptation (and a stronger tMAE) the faster the adapting speed, regardless of the test speed. In contrast, speed tuning of direction-sensitive neurons predicts the greatest tMAE when the adapting and test stimuli have matching speeds. We found that the strength of the tMAE increased monotonically with adapting speed, regardless of the test speed, showing no evidence of speed tuning. Our data are consistent with neurophysiological findings that suggest an intensive code for speed along the motion processing pathways comprising neurons sensitive both to speed and direction of motion.

scholarly journals Emergent Filling In Induced by Motion Integration Reveals a High-Level Mechanism in Filling In

2012 ◽  
Vol 23 (12) ◽  
pp. 1534-1541 ◽  
Author(s):  
Zhicheng Lin ◽  
Sheng He
Keyword(s):  
Selective Attention ◽  
Visual System ◽  
Motion Aftereffect ◽  
Local Motion ◽  
Lateral Occipital Complex ◽  
Middle Temporal ◽  
Dynamic Motion ◽  
Perceptual Completion ◽  
High Level ◽  
Symbolic Processes

The visual system is intelligent—it is capable of recovering a coherent surface from an incomplete one, a feat known as perceptual completion or filling in. Traditionally, it has been assumed that surface features are interpolated in a way that resembles the fragmented parts. Using displays featuring four circular apertures, we showed in the study reported here that a distinct completed feature (horizontal motion) arises from local ones (oblique motions)—we term this process emergent filling in. Adaptation to emergent filling-in motion generated a dynamic motion aftereffect that was not due to spreading of local motion from the isolated apertures. The filling-in motion aftereffect occurred in both modal and amodal completions, and it was modulated by selective attention. These findings highlight the importance of high-level interpolation processes in filling in and are consistent with the idea that during emergent filling in, the more cognitive-symbolic processes in later areas (e.g., the middle temporal visual area and the lateral occipital complex) provide important feedback signals to guide more isomorphic processes in earlier areas (V1 and V2).

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 The effect of blue light filtering lenses on speed perception

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Adiba Ali ◽  
Maitreyee Roy ◽  
Hind Saeed Alzahrani ◽  
Sieu K. Khuu
Keyword(s):  
Test Stimulus ◽  
Blue Light ◽  
Motion Perception ◽  
Unintended Consequences ◽  
Reference Stimulus ◽  
Choice Procedure ◽  
Speed Perception ◽  
Forced Choice Procedure ◽  
Perceived Speed ◽  
Method Of Constant Stimuli

AbstractBlue-light filtering lenses (BFLs) are marketed to protect the eyes from blue light that may be hazardous to the visual system. Because BFLs attenuate light, they reduce object contrast, which may impact visual behaviours such as the perception of object speed which reduces with contrast. In the present study, we investigated whether speed perception is affected by BFLs. Using a two-interval forced-choice procedure in conjunction with Method of Constant Stimuli, participants (n = 20) judged whether the perceived speed of a moving test stimulus (1.5–4.5°/s) viewed through a BFL was faster than a reference stimulus (2.75°/s) viewed through a clear lens. This procedure was repeated for 3 different BFL brands and chromatic and achromatic stimuli. Psychometric function fits provided an estimate of the speed at which both test and reference stimuli were matched. We find that the perceived speed of both chromatic and achromatic test stimuli was reduced by 6 to 20% when viewed through BFLs, and lenses that attenuated the most blue-light produced the largest reductions in perceived speed. Our findings indicate that BFLs whilst may reduce exposure to hazardous blue light, have unintended consequences to important visual behaviours such as motion perception.

scholarly journals Effect of central and surrounding gratings of test stimulus on appearance of motion aftereffect

2002 ◽  
Vol 73 (1) ◽  
pp. 71-77
Author(s):  
Isao Watanabe ◽  
Shinya Fukuura ◽  
Hiroyuki Ito
Keyword(s):  
Test Stimulus ◽  
Motion Aftereffect

scholarly journals The “Spinner” Illusion: More Dots, More Speed?

i-Perception ◽  
2017 ◽  
Vol 8 (3) ◽  
pp. 204166951770797
Author(s):  
Hiroshi Ashida ◽  
Alan Ho ◽  
Akiyoshi Kitaoka ◽  
Stuart Anstis
Keyword(s):  
Test Stimulus ◽  
Temporal Frequency ◽  
Angular Speed ◽  
Circular Path ◽  
Reference Stimulus ◽  
Spatial Frequencies ◽  
Sinusoidal Gratings ◽  
Speed Perception ◽  
Perceived Speed

The perceived speed of a ring of equally spaced dots moving around a circular path appears faster as the number of dots increases (Ho & Anstis, 2013, Best Illusion of the Year contest). We measured this “spinner” effect with radial sinusoidal gratings, using a 2AFC procedure where participants selected the faster one between two briefly presented gratings of different spatial frequencies (SFs) rotating at various angular speeds. Compared with the reference stimulus with 4 c/rev (0.64 c/rad), participants consistently overestimated the angular speed for test stimuli of higher radial SFs but underestimated that for a test stimulus of lower radial SFs. The spinner effect increased in magnitude but saturated rapidly as the test radial SF increased. Similar effects were observed with translating linear sinusoidal gratings of different SFs. Our results support the idea that human speed perception is biased by temporal frequency, which physically goes up as SF increases when the speed is held constant. Hence, the more dots or lines, the greater the perceived speed when they are moving coherently in a defined area.

scholarly journals Perceived speed of the dynamic motion after-effect (MAE)

2004 ◽  
Vol 4 (8) ◽  
pp. 547-547
Author(s):  
W. Curran ◽  
C. P. Benton
Keyword(s):  
Dynamic Motion ◽  
After Effect ◽  
Perceived Speed

scholarly journals Two temporal channels underlie the dynamic motion aftereffect

2010 ◽  
Vol 2 (7) ◽  
pp. 373-373
Author(s):  
F. A.J. Verstraten ◽  
D. Alais ◽  
D. Burr
Keyword(s):  
Motion Aftereffect ◽  
Dynamic Motion

scholarly journals Asymmetric transfer of the dynamic motion aftereffect between first- and second-order cues and among different second-order cues

10.1167/7.8.1 ◽  
2007 ◽  
Vol 7 (8) ◽  
pp. 1 ◽  
Author(s):  
Andrew J. Schofield ◽  
Timothy Ledgeway ◽  
Claire V. Hutchinson
Keyword(s):  
Motion Aftereffect ◽  
Second Order ◽  
Dynamic Motion

Difference of Spatial Frequency Selectivity between Static and Flicker Motion Aftereffects

Perception ◽  
1994 ◽  
Vol 23 (11) ◽  
pp. 1313-1320 ◽  
Author(s):  
Hiroshi Ashida ◽  
Naoyuki Osaka
Keyword(s):  
Spatial Frequency ◽  
Test Stimulus ◽  
Motion Aftereffect ◽  
Frequency Selectivity ◽  
Spatial Frequencies ◽  
Sinusoidal Gratings ◽  
Early Processing ◽  
Motion Aftereffects

The strength of motion aftereffect (MAE) was measured with the use of sinusoidal gratings of several spatial frequencies, to examine the spatial frequency selectivity of two types of MAE. With ordinary static grating as a test stimulus, to measure ‘static MAE’, the maximum aftereffect for each adapting spatial frequency was obtained at the testing stimuli of the same spatial frequency, showing spatial frequency selectivity. However, in the case when the sinusoidally flickering grating was used as a test stimulus, to measure ‘flicker MAE’, no spatial frequency selectivity was observed. The two types of MAE were considered to be based on different mechanisms. Static MAE is thought to depend on the spatiotemporal channel mechanism in the early processing stages, whereas flicker MAE might reflect higher-level processes which might occur at the extrastriate regions.

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