摘要
实验中用电视方法产生正弦光栅图形,系统地研究了正弦光栅刺激面积的大小和空间频率通道之间的相关。结果表明,随正弦光栅显示面积的增加(由1°、2°增至5°、10°)提高了人眼对低频光栅的敏感性,扩大了对低空间频率的适应范围(自3周/度至0.2周/度)。实验中进一步阐明了最低空间频率通道的位置是随光栅显示面积的增加而向低频处延伸。此外还观察到低频通道的带宽带有非对称性的特征,一般表现为上边频频带大于下边频频带。从实验结果中可认为低空间频率通道是存在的,而光栅显示面积的变化是显示低频通道的重要条件。
The relation between stimulus size of sine gratings and the low spatialfrequency channels has been systematically investigated by television technique. Experimental data suggest that the human visual system contains thelow spatial frequency channels. Variation of stimulus area of gratings is asignigicant condition for the display of the low spatial frequency channels. Itwas found that with the area of sine gratings increasing (from, 1°, 2°to 5°,10°field), human eyes become more sensitive to the low spatial frequency,to which the position of the lowest spatial frequency channels is leading, andadaptable range of the low spatial frequency is extended (from 3 c/d to 0.2c/d). At 10°visual field position of the lowest spatial frequency channelsstays at 0.3 c/d. The asymmetry of the bandwidth of the low spatial frequencychannels has also been observed.
出处
《心理学报》
1981年第2期207-211,共5页
Acta Psychologica Sinica
