Learn More
Stereo (front-back) discrimination thresholds were measured in a two-interval forced-choice paradigm for chromatic (red-green) random-dot stereograms that had all detectable longitudinal and transverse aberrations removed by low-pass filtering. The thresholds were measured as a function of the luminance ratio of the red and the green stereo elements.(More)
Several discriminability measures were examined for their ability to predict reading search times for three levels of text contrast and a range of backgrounds (plain, a periodic texture, and four spatial-frequency-filtered textures created from the periodic texture). Search times indicate that these background variations only affect readability when the(More)
  • L F Scharff
  • 1997
The interaction between dot separation and fusible disparity limits (critical disparity gradient) was assessed at 0, 2, 4, and 8 deg eccentricity by 19 subjects. The critical disparity gradient showed a significant decrease with eccentricity such that larger separations were required for fusion of a given disparity as eccentricity increased. An argument is(More)
Probe recognition tasks have shown the effects of sleep deprivation following a full night of sleep loss. The current study investigated shorter durations of deprivation by testing 11 subjects for accuracy and response time every 2 hr. from 10 p.m. through 8 a.m. We replicated Elkin and Murray's auditory single-probe recognition task using the number(More)
Will a simple global masking model based on image detection be successful at predicting the readability of transparent text? Text readability was measured for two types of transparent text: additive (as occurs in head-up displays) and multiplicative (which occurs in see-through liquid crystal display virtual reality displays). Text contrast and background(More)
Our previous experiments with additive and multiplicative transparent text on textured backgrounds show that readability can be more accurately predicted by adjusting the contrast with a contrast-gain-like divisive factor that includes the background RMS contrast. However, the factor performed poorly at predicting readability differences on two different(More)
part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee.(More)
Many areas of the brain have been implicated in the sleep cycle, but a holistic picture of their involvement is hard, if not impossible, to find. This paper is meant to summarize in relevant detail the major players in sleep initiation in the mammalian brain. The major players in sleep were broken into two categories: sleep-agonists and sleep-antagonists.(More)
  • 1