PHOTORECEPTOR SPECTRAL SENSITIVITIES - COMMON SHAPE IN THE LONG-WAVELENGTH REGION
PHOTORECEPTOR SPECTRAL SENSITIVITIES - COMMON SHAPE IN THE LONG-WAVELENGTH REGION
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DOI：
10.1016/0042-6989(95)00114-f
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发表时间：
1995-11-01
期刊：
影响因子：
1.8
通讯作者：
LAMB, TD
中科院分区：
文献类型：
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作者：
LAMB, TD
以前的测量哺乳动物感光器光谱灵敏度进行了分析，特别注意到长波长区域。研究所用的测量数据来自视杆细胞和视锥细胞系统，以及人、猴、牛和松鼠。对于来自光感受器电生理学和来自心理物理敏感性的光谱，采用了曼斯菲尔德的频率标度法，（1985，视觉系统，第89-106页，纽约：Alan利斯）在至少7个对数（10）单位的灵敏度范围内提供了一个共同的形状，从低频（长波长）到超过峰值的频率。同样的曲线也适用于牛视紫红质的吸收光谱，尽管只能测量低于峰值约2 log（10）单位的吸收，在最长波长处，结果显示出70 log（e）单位的共同极限斜率（或30.4 log（10）单位）每单位归一化频率，提出了一个简单的方程作为哺乳动物光感受器光谱灵敏度曲线α带的一般描述，并且似乎该方程可能同样适用于其它物种中的基于视网膜（1）的色素。尽管缺乏理论基础，但该方程在长波长处具有正确的渐近行为，并且它提供了对峰的准确描述，它还准确地解释了实验观察到的超过700 nm的长波长光的“泛黄”。
Previous measurements of mammalian photoreceptor spectral sensitivity have been analysed, with particular attention to the long-wavelength region. The measurements selected for study come from rod and cone systems, and from human, monkey, bovine and squirrel sources, For the spectra from photoreceptor electrophysiology and from psychophysical sensitivity, the frequency scaling applied by Mansfield (1985, The visual system, pp, 89-106, New York: Alan Liss) provides a common shape over a range of at least 7 log(10) units of sensitivity, from low frequencies (long wavelengths) to frequencies beyond the peak. The same curve is applicable to the absorbance spectrum of bovine rhodopsin, although the absorbance can only be measured down to about 2 log(10) units below the peak, At the longest wavelengths the results exhibit a common limiting slope of 70 log(e) units (or 30.4 log(10) units) per unit of normalized frequency, A simple equation is presented as a generic description for the alpha-band of mammalian photoreceptor spectral sensitivity curves, and it seem likely that the equation may be equally applicable to retinal(1)-based pigments in other species, Despite the lack of a theoretical basis, the equation has the correct asymptotic behaviour at long wavelengths, and it provides an accurate description of the peak, It also accounts accurately for the experimentally observed ''yellowing'' of long-wavelength lights that occurs beyond 700 nm.