Background: If human touch an object, even if they are blindfolded, they can reliably perceive
its properties, such as temperature, material, length, height, texture and so on. In this study, we focused
on investigating length perception, because length perception was an essential factor of object
Objective and Methods: 15 young and 15 old subjects participated in this experiment. They were blindfolded
during experiment and actively grasped the displayed length with thumb and index finger and
then perceived it. Two working memory-related experiments, varied delay times experiment and n-back
experiment were performed separately, in order to investigate whether length discrimination abilities of
young and old subjects degraded with aging.
Results and Conclusion: With the increment of delay times, length discrimination threshold of both
young and old subjects increased, delay times significantly affected length discrimination. No agerelated
differences were found in varied delay times length discrimination experiment. However, we did
confirm age-related differences in n-back length discrimination experiment.