original article   mental fatigue (mf) is considered as a contributor factor in incident, even catastrophic one. electroencephalography measurement has been the most acceptable method to assess mf by neurologists. however, this method could be hardly feasible in real work setting. flicker fusion device, by contrast, is more usable at work setting. the purpose of this study was to compare the cr...

The Krasno-Ivy nitroglycerin-flicker fusion test was carried out in normal persons, and in patients with arterial hypertension and/or coronary disease. A positive test was obtained more often in patients with cardiovascular abnormalities than in normal individuals. In the former group the frequency of negative results and the inconstancy of response to multiple tests indicate the unrelia-bility...

When two isoluminant colors alternate at frequencies > 10 Hz, we perceive only one fused color with a minimal sensation of brightness flicker. In spite of the perception of color fusion, color opponent (CO) cells at early stages of the visual pathway are known to respond to chromatic flicker at frequencies far exceeding the perceptual fusion frequency. To explain color fusion, several groups ha...

The nitroglycerin-flicker test, as suggested and modified by Krasno and Ivy, has been used to test normal individuals and patients with a variety of cardiovascular diseases. The hypothesis that this test would serve as an index of the presence of vascular disease or spasm elsewhere in the body than the retina was explored. These studies have failed to justify the drawing of conclusions based on...

1 flicker rates, but when the frequency is raised to 5-20 Hz, color flicker fusion occurs, where the e s flicker is seen as a variation of intensity only. Th ubject can eliminate all sensation of flicker by h p balancing the intensities of the two lights (at whic oint the lights are said to be equiluminant). When r c the intensities are not balanced, the luminance flicke an be seen at frequenci...

1. The flicker fusion frequency for blue stimuli on zero background increases steadily with increasing luminance up to 50 c/s, but if a strong yellow background is added it increases steadily only to about 18 c/s, and then remains nearly independent of luminance over a range of a factor of 20.2. It is argued that the maximum flicker fusion frequency is about three times lower for the blue-sensi...

The effects of light adaptation on flicker fusion frequency were examined in the photoreceptors of 13 species of deep-sea crustaceans. Light adaptation produced a significant increase in the maximum critical flicker fusion frequency (CFF(max)) in 7 species-all 6 species of euphausiids in the study, and 1 species of oplophorid (Group 1). This is the first example of an increase in temporal resol...