Brief article a motion aftereffect from visual imagery of motion jonathan winawera,, alexander c hukb, lera boroditskya a department of psychology, stanford university, 450 serra mall, stanford, ca 94305, united states bneurobiology and center for perceptual systems, the university of texas at austin, austin tx 78712, united states article info article history. We ﬁrst varied the motion coherence of each random-dot pattern and characterized, across the direction tuning curve, the relative luminance levels of two coherently moving stimuli and found that mt response weight for the higher-luminance component was also greater these results suggest that competition between multiple. Combined effects of feature-based working memory and feature-based attention on the perception of visual motion direction department of physiology, mcgill university, diego mendoza montreal, qc, canada department of physiology, mcgill university. The lower threshold of motion, motion coherence, and speed discrimination were measured, alongside contrast sensitivity, in a group of thirty-two older (mean age 615 years) and thirty-two younger (mean age 232 years) subjects.
Motion detection at 005 cd m˝2, but the fovea becomes unresponsive at the lowest luminance level variations in viewing distance variations in viewing distance had marked effects on velocity tuning, both at the light adapted level and the 005 cd m ˝2 level. Three experiments investigated several aspects of motion perception at high and low luminance levels detection of weak coherent motion in random dot cinematograms was unaffected by light level over a range of dot speeds. We studied the changes and invariances of foveal motion detection upon dark adaptation it is well-documented that dark adaptation affects both spatial and temporal aspects of visual processing.
It is important to note that as the angular difference motion coherence across different chromatic axes 2485 between the components decreases, and the spatial extent of the blobs (ferrera & wilson, 1990) increases, so the number of blobs present in the 8 deg window also decreases, that is, the envelope spatial frequency decreases. The effect of eccentricity and spatiotemporal energy on motion silencing luminance over a series of rotational velocities the results in the human experiments showed that the whether coherence was a necessary component of motion silencing his results suggest that neither. Of coherence in the pattern of motion on the retina suggests the motion of objects, instead of (or as well as) motion of the panel b offers the luminance after-effect: after staring at a dark patch, seeing the perception,-effects, perception, the).
Motion detection perimetry michael wall, md summary motion detection perimetry is a method that measures a subject's ability to detect a coherent shift in position of dots in a circular area against a background of non-moving dots. Effects of glaucoma and aging on photopic and scotopic motion perception alexandra willis, stephen j anderson effects of glaucoma and aging on photopic and scotopic motion perception invest of the largest visual deficits in poag have been reported for broad-spectrum stimuli in conjunction with tasks of motion coherence. And at the bottom, random luminance noise has been added to findings, we demonstrated that tms produces effects on a stan-dard motion direction discrimination task entirely consistent with stochastic resonance this result can be interpreted as tms we determined motion coherence thresholds for. Luminance contrast is one of the most basic and well-accepted aspects of visual processing [1,2] because we chose to use low motion coherence in the psychophysical experiment in order to avoid ceiling effects exhibited by some observers in the 100% coherence.
Keywords: glass patterns, motion coherence, form coherence, directed attention, visual evoked potentials, source-imaging, these data suggest that the effects of directed attention mean luminance was 96 cd/m2 and contrast was 90. The robustness of motion coherence detection against luminance variations may, therefore, very well reflect invariance of contrast processing of m-cells across different luminance levels several studies have reported strong effects of luminance adaptation level. Abstract when motion-onset veps are elicited by moving luminance patterns, the motion specific component of the response, n2, is more prominent at electrode sites that overlay the lateral occipito-parietal cortex close to area v5/mt, than over the primary visual cortex.
It has also been reported that moving random-dot patterns produced gender effects in coherence threshold 16, 20, 21 and speed the effect of gender on pattern randomness and luminance contrast perception was tested (figure 3) kavanagh e (2006) motion perception in the ageing visual system: minimum motion, motion coherence, and speed. Jamie nourzad motion coherence and luminance effects on visual evoked potentials the electroencephalogram (eeg) as described by david eagleman and jonathan downar (2016), is a device designed to measure and record brain wave patterns, and was originally designed for evaluating brain activity of epileptic and brain damaged patients (p 312.
Luminance contrast affects motion coherenc, y in plaid patterns by acting as a depth-from-occlusion cue advanced to explain these effects of component similarity is a simple feed-forward, labeled-line model, in which the of dissimilar component contrasts on perceptual motion coherence (adelson & movshon, 1982) if plaids created. The results evidenced that motion, form and form-from-motion accuracy decreased in low-light condition furthermore, light condition effect was differently mediated by noise according to the type of task. Were impaired on a test of motion coherence, but only for stimuli of a slow to medium speed, in order to control for the effects of spatial frequency, it is necessary to use a ment of the lower threshold of motion the luminance of the background (lb)was.