PSYCHOPHYSICAL EVIDENCE FOR SUSTAINED AND TRANSIENT DETECTORS IN HUMAN VISION
PSYCHOPHYSICAL EVIDENCE FOR SUSTAINED AND TRANSIENT DETECTORS IN HUMAN VISION
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DOI：
10.1113/jphysiol.1973.sp010261
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发表时间：
1973-01-01
影响因子：
5.5
通讯作者：
TOLHURST, DJ
中科院分区：
文献类型：
--
作者：
KULIKOWSKI, JJ;TOLHURST, DJ
1.确定了对时间调制正弦光栅的灵敏度。对于调制光栅可以区分两个阈值：可以感知闪烁的对比度和空间结构变得明显的对比度.闪烁检测阈值和模式识别阈值作为空间和时间频率的函数独立地变化，这表明这两个阈值代表两个独立的通道系统的活动。检测闪烁的通道优选低和中等空间频率。它们在正弦调制的低时间频率下具有明显的灵敏度下降。它们对相位重复交替的光栅的响应是以相同速率打开和关闭光栅的两倍。负责区分空间结构的通道在高和中空间频率下最敏感。在低时间频率下灵敏度没有下降。这些通道同样很好地响应交替和开/关光栅高达约8赫兹。正弦调制所揭示的时间特性表明，闪烁检测通道将对长时间的刺激呈现产生瞬态响应：负责分析空间结构的通道将产生持续的响应。两种类型的通道交替和开/关光栅的响应证实了这一建议。
1. The sensitivity to temporally modulated sinusoidal gratings was determined. Two thresholds could be distinguished for the modulated gratings: the contrast at which flicker could be perceived and the contrast at which the spatial structure became distinct.2. The flicker detection thresholds and pattern recognition threshold varied independently as functions of the spatial and temporal frequencies, suggesting that the two thresholds represent the activity of two independent systems of channels.3. The channels detecting flicker prefer low and medium spatial frequencies. They have a pronounced decline in sensitivity at low temporal frequencies of sinusoidal modulation. They respond twice as well to gratings whose phase is alternated repetitively as to gratings turned on and off at the same rate.4. The channels responsible for the discrimination of spatial structure are most responsive at high and medium spatial frequencies. There is no decline in sensitivity at low temporal frequencies. These channels respond equally well to alternating and on/off gratings up to about 8 Hz.5. The temporal properties as revealed with sinusoidal modulation, suggest that the flicker‐detecting channels would give transient responses to prolonged presentation of stimuli: the channels responsible for analysing the spatial structure would give sustained responses. The responses of the two types of channel to alternating and on/off gratings confirm this suggestion.