exposure to radiation from different types of television sets was measured to ascertain the levels of hazards posed to the human biological system. measurement of the annual radiation dose hazards was performed using a halogen-quenched gm tube with thin mica end window having a density of 1.5 mg/cm2, effective window diameter of 0.360 inch and side wall of 0.012 inch thick. the gm tube was plac...

Exposure to radiation from different types of television sets was measured to ascertain the levels of hazards posed to the human biological system. Measurement of the annual radiation dose hazards was performed using a halogen-quenched GM tube with thin mica end window having a density of 1.5 mg/cm2, effective window diameter of 0.360 inch and side wall of 0.012 inch thick. The GM tube was plac...

As the frequency of a flickering light is increased, the perception of flicker is replaced by the perception of steady light at what is known as the critical flicker fusion threshold (CFFT). This threshold provides a useful measure of the brain's information processing speed, and has been used in medicine for over a century both for diagnostic and drug efficacy studies. However, the hardware fo...

Exposure to radiation from different types of television sets was measured to ascertain the levels of hazards posed to the human biological system. Measurement of the annual radiation dose hazards was performed using a halogen-quenched GM tube with thin mica end window having a density of 1.5 mg/cm2, effective window diameter of 0.360 inch and side wall of 0.012 inch thick. The GM tube was plac...

PURPOSE To compare the sensitivity of hyperacuity of patients with cyclovertical deviation with that of subjects with normal vision. METHODS The sensitivity of hyperacuity was measured in 42 volunteers with normal vision and in 12 patients with cyclovertical deviation, using a newly developed computerized device that randomly presents two opposing targets at vertical or at horizontal directio...

An increasing demand to work with electronic displays and to use mobile computers emphasises the need to compare visual performance while working with different screen types. In the present study, a cathode ray tube (CRT) was compared to an external liquid crystal display (LCD) and a Notebook-LCD. The influence of screen type and viewing angle on discrimination performance was studied. Physical...

CRT white point, adapted white point, chromatic adaptation, viewing condition, monitor characterization, psychophysics, neutral point, mixed mode illumination, incomplete adaptation An iterative psychophysical algorithm is designed and implemented to determine the adapted white point for cathode ray tubes (CRTs) in a given viewing condition. This algorithm can accurately determine the chromatic...

This note looks into the reasons why earlier reports may have arrived at differing conclusions about pigeons' capacity to categorize bilaterally symmetric and asymmetric visual patterns. Attention is drawn to pigeons' comparatively superior visual flicker resolution and superior visual linear acuity by reporting results of two ad-hoc experiments. This circumstance turns out to constrain conclus...