Older observers have attenuated increment thresholds upon transient backgrounds.
Older observers have attenuated increment thresholds upon transient backgrounds.
复制标题
年长的观察者在瞬态背景下减弱了增量阈值。
DOI：
10.1093/geronj/41.6.743
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Taub,HA
中科院分区：
文献类型：
--
作者：
Sturr,JF;Church,KL;Nuding,SC;VanOrden,K;Taub,HA
测量年轻、中年和老年观察者的中心凹增量阈值。这些阈值涉及检测作为较大背景适应场（AF）的强度的函数的小测试闪光，在AF开始的瞬间（瞬态条件）和当眼睛已经完全适应AF（稳态条件）时测量。所有刺激都通过2mm人工瞳孔在自由观察系统中呈现给左眼。对于所有年龄组的稳态条件，功能相似，但对于瞬态条件，老年观察员的斜率明显低于年轻观察员。这些发现与老年视觉系统中瞬时（Y）通道选择性丧失的假设一致
Foveal increment thresholds were measured in young, middle-aged, and older observers. These thresholds, which involved the detection of a small test flash as a function of the intensity of a larger background adapting field (AF), were measured at the instant of onset of the AF (transient condition) and when the eye had been fully light adapted to the AF (steady-state condition). All stimuli were presented to the left eye in a free-viewing system through a 2 mm artificial pupil. For the steady-state condition for all age groups, the functions were similar, but for the transient condition, the slope for the older observers was significantly less steep than that for the younger observers. These findings are consistent with an hypothesis of a selective loss of transient (Y) channels in the aging visual system