Kurtev A D, Penchev A N
Department of Physiology, Medical Academy, Sofia.
Acta Physiol Pharmacol Bulg. 1991;17(1):7-12.
The results of a number of experimental works showed that with brief presentation times the visual system can be perceived as a low-frequency spatial filter. In order to verify this hypothesis, we studied the recognition of clear visual patterns (with full spatial-frequency spectrum) and defocused patterns (with optically cut high spatial frequencies), with brief presentation times. We used the method of constant stimuli (simple geometric figures), which were presented tachystoscopically with preceding and subsequent masking. Two experimental subjects took part in the research. The results show that, contrary to our expectations, clear patterns were recognized better after brief presentation times. This shows that when brief presentation times are used, the high spatial frequencies are also accessible for processing by the visual system, contributing at the same time to the better recognition of shapes.
大量实验研究结果表明，在短暂呈现时间下，视觉系统可被视为一个低频空间滤波器。为了验证这一假设，我们研究了在短暂呈现时间下，清晰视觉模式（具有完整空间频率谱）和散焦模式（光学切断高空间频率）的识别情况。我们使用了恒定刺激法（简单几何图形），这些图形通过速示器呈现，并伴有前后掩蔽。两名实验对象参与了该研究。结果表明，与我们的预期相反，在短暂呈现时间后，清晰模式的识别效果更好。这表明，当使用短暂呈现时间时，高空间频率也可供视觉系统处理，同时有助于更好地识别形状。
