Luria S M
Percept Mot Skills. 1977 Feb;44(1):47-53. doi: 10.2466/pms.1977.44.1.47.
Thresholds for letters were measured with and without a masking stimulus (presented either to the same eye as the letters or to the other eye) before and after exposure of smokers and nonsmokers to 500 ppm carbon monoxide (CO) in air for 1 hr. Identification of the unmasked letters was not degraded by CO but a number of thresholds of the masked letters were significantly affected among the smokers. The effects of the CO on binocular and interocular masking were similar. These results suggest that the first effects of CO toxicity are neither on the receptors nor central but on the transmission lines in between and that smokers are more susceptible than nonsmokers to short-term increases in the level of CO. The masking phenomenon, however, does not appear to be an unusually sensitive measure of CO toxicity.
在吸烟者和不吸烟者于空气中暴露于500 ppm一氧化碳（CO）1小时之前和之后，分别在有和没有掩蔽刺激（呈现于与字母相同的眼睛或另一只眼睛）的情况下测量字母识别阈值。未被掩蔽字母的识别未因CO而降低，但吸烟者中一些被掩蔽字母的阈值受到显著影响。CO对双眼和两眼间掩蔽的影响相似。这些结果表明，CO毒性的最初影响既不是对感受器也不是对中枢，而是对其间的传输线路，并且吸烟者比不吸烟者对CO水平的短期升高更敏感。然而，掩蔽现象似乎并不是CO毒性的异常敏感指标。
