by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va .
Written in English
|Statement||Leland S. Stone, Peter Thompson.|
|Series||NASA technical memorandum -- 103898., NASA technical memorandum -- 103898.|
|Contributions||Thompson, Peter., Ames Research Center.|
|The Physical Object|
contrast grating appears slower than a 70% contrast grating moving at the same speed). On average, a 70% contrast grating must be slowed by 35% to match a 10% contrast grating moving at 2 degrees/sec (N = 6). Furthermore, the effect is largely independent of the absolute contrast level and is a quasi-linear functionCited by: The effect of contrast on speed perception was first noted by Thompson () who demonstrated that, at slow speeds, low-contrast stimuli appear to move slower than high-contrast stimuli. However, as speed increases this effect reduces and at high speeds can even reverse, such that low-contrast stimuli appear faster than high-contrast by: 3. Abstract. We have previously shown that contrast affects speed perception, with lower-contrast, drifting gratings perceived as moving slower. In a recent study, we examined the implications of this result on motion models of speed perception that use the amplitude of the response of linear spatio-temporal filters to determine speed. Human speed perception is contrast dependent. When two parallel gratings moving at the same speed are presented simultaneously, the lower-contrast grating appears slower. This misperception is evident across a wide range of contrasts ( percent) and does not appear to saturate. Furthermore, the effect is largely independent of the.
Human speed perception is contrast dependent. Furthermore, the effect is largely independent of the absolute contrast level and is a quasi-linear function of log contrast ratio. A preliminary parametric study shows that, although spatial frequency has little effect, relative orientation is important.  Stone LS, Thompson P. “Human speed perception is contrast dependent,” Vision Research pp. ,  Thompson P, Stone L S, Swash S “Speed estimates from. Effects of contrast polarity in paracontrast masking. Attention, Perception and U., Kafaligonul, H. (). Neural mechanisms underlying auditory time interval effects on perceived visual speed. Annual Meeting of the Society for Neuroscience, San Diego, CA. H., Bedell, H.E. (). Effect of exposure duration and contrast on human blur. In summary, at contrasts below 15%, our results are in qualitative agreement with the finding of Hawken, Gegenfurtner, and Tang () that as reference speed increased, the effect of contrast on perceived speed diminished and in one case even reversed. However, our results at higher contrasts (where both gratings had contrasts at least 15%) show the opposite effect: as reference speed increased, low contrast decreased perceived speed even more .
The contrast effect is a cognitive bias that distorts our perception of something when we compare it to something else, by enhancing the differences between them. This comparison can be either explicit or implicit, simultaneous or at separate points in time, and can apply to various traits, ranging from physical qualities, such as color and taste, to more abstract qualities, such as price and. Journals & Books; Help Download PDF Download. Share. Export. Advanced. Vision Research. Vol April , Pages Contrast dependency and prior expectations in human speed perception. Author links open overlay panel Grigorios Sotiropoulos a Aaron R. Seitz b Peggy Seriès a. Show more. Examines contrast sensitivity of the human visual system--concerning the eye's ability to distinguish objects from each other or from the background--and its effects on the image-forming process. The text provides equations for determining various aspects of contrast sensitivity, in addition to models (mathematical expressions) that can easily Reviews: 3. “Use basic human psychology to improve the perception of speed of your application or website.” — Claudia Elliott On the other hand, if they perceive your site to be loading slowly, they may leave before they see what you have to offer — or be aggravated or frustrated without realizing why.