The effects of aging on information-processing channels in the sense of touch .3. Differential sensitivity to changes in stimulus intensity
The effects of aging on information-processing channels in the sense of touch .3. Differential sensitivity to changes in stimulus intensity
复制标题
DOI：
10.3109/08990229609028914
复制
发表时间：
1996-01-01
影响因子：
0.9
通讯作者：
Verrillo, RT
中科院分区：
文献类型：
--
作者：
Gescheider, GA;Edwards, RR;Verrillo, RT
检测阈值和差异limens测量16名受试者，年龄从19岁到91岁。刺激是通过3.0厘米（2）的接触器向右手鱼际施加250 Hz的振动脉冲。检测阈值较高，在老年人比年轻的受试者，是绝对值的差异limens。当差异阈限以相对而言的比例表示，其中两个刺激不同的幅度进行区分（Δ A/A），辨别能力不受年龄的影响，除了刺激略高于检测阈值，在这种情况下，老年受试者的差异阈限显着高于年轻受试者。结果是一致的假设，即在老年受试者的检测阈值的海拔是减少传入输入到中枢脑中心，就其能力来检测阈值水平的刺激的存在和阈上刺激之间的区别，是相对不受影响的老化的结果。
Detection thresholds and difference limens were measured for 16 subjects ranging from 19 to 91 years of age. The stimuli were 250-Hz bursts of vibration applied through a 3.0-cm(2) contactor to the thenar eminence of the right hand. Detection thresholds were higher in older than in younger subjects, as were the absolute values of difference limens. When the difference limen was expressed in relative terms as the proportion by which two stimuli had to differ in amplitude to be discriminated (Delta A/A), discriminative capacities were unaffected by aging except for stimuli slightly above the detection threshold, in which case the difference limens of older subjects were significantly higher than those of younger subjects. The results are consistent with the hypothesis that elevations in the detection thresholds of older subjects are the results of reduced afferent input to central brain centers that, with regard to their capacity to detect the presence of threshold-level stimuli and to discriminate differences among suprathreshold stimuli, are relatively unaffected by aging.