Kubo-Kawai Namiko, Kawai Nobuyuki
Department of Behavioral Brain Science, Primate Research Institute, Kyoto University, Kanrin, Inuyama, Aichi, Japan.
J Comp Psychol. 2007 May;121(2):189-97. doi: 10.1037/0735-7036.121.2.189.
Spatial information processing was assessed in 3 young (4-10 years old) and 4 aged (24-25 years old) Japanese monkeys (Macaca fuscata) on 3 delayed nonmatching-to-position (DNMP) tests with relatively short delays of 5 s. Each test had 3 conditions of different horizontal distances between sample and to-be-nonmatched positions. Experiment 1 demonstrated that the performance on the DNMP test in both age groups was impaired when 2 stimulus positions were located next to each other; however, it was fairly accurate when they were located farther apart, suggesting that interference is introduced by spatial proximity. Experiment 2 revealed age-related differences in the situation in which an additional spatial cue, depth information, was available by extending the stimulus array of the DNMP test to a 4 x 2 matrix. In this test, young monkeys performed accurately irrespective of position distance between stimuli, whereas the aged monkeys' performance remained the same as before. Experiment 3 confirmed that the recognition ability in aged monkeys was well preserved on DNMP tests with different objects. These patterns of results indicate that the ability to use information from multiple spatial cues is not accessible to the aged monkeys.
在3只幼年（4 - 10岁）和4只成年（24 - 25岁）日本猕猴（食蟹猴）身上进行了空间信息处理评估，这些猕猴接受了3次延迟位置匹配（DNMP）测试，延迟时间相对较短，为5秒。每次测试有3种条件，样本位置和待匹配位置之间的水平距离不同。实验1表明，当两个刺激位置相邻时，两个年龄组在DNMP测试中的表现都会受损；然而，当它们相距较远时，表现相当准确，这表明空间接近会引入干扰。实验2揭示了与年龄相关的差异，在这种情况下，通过将DNMP测试的刺激阵列扩展为4×2矩阵，可以获得额外的空间线索，即深度信息。在这个测试中，幼年猕猴无论刺激之间的位置距离如何都能准确执行，而成年猕猴的表现与之前相同。实验3证实，成年猕猴在使用不同物体的DNMP测试中的识别能力得到了很好的保留。这些结果模式表明，成年猕猴无法利用来自多个空间线索的信息。
