霊長類研究
Online ISSN : 1880-2117
Print ISSN : 0912-4047
ISSN-L : 0912-4047
検索
詳細検索
OR
閲覧
検索
23 巻, 2 号
選択された号の論文の8件中1～8を表示しています
すべての抄録を表示する
    • |<
    • <
    • 1
    • >
    • >|
原著
  • 新世界ザルにおける下顎大臼歯から推測する上顎大臼歯の形態
    - wear facet 8 とhypocone の関係について-
    堀 智彦
    原稿種別: 原著
    2007 年 23 巻 2 号 p. 61-70
    発行日: 2007/12/20
    公開日: 2009/03/13
    DOIhttps://doi.org/10.2354/psj.23.61
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    The upper molars carry a good amount of information for identifying the fossil Platyrrhines, whereas the lower molars do not. However, the upper molars are not found so much as the lower molars. It is supposed that the occlusal feature of an upper molar is inferred from the occlusal morphology of the respective lower molar. It is hypothesized that wear facet 8 is indicative of the hypocone, as it is formed in the distal part of entocristid of a lower molar by the occlusion with hypocone which is important trait classifying Callitrichine from other Platyrrhines. However, the development of lingual cingulum may give confounding effect on the development of facet 8. In this study, using specimens of Saimiri (hypocone present), Callithrix (hypocone absent) and Saguinus(hypocone partially present), which had different degree of occlusal wearing, I observed both of the upper and lower first molars for the presence both of the wear facet 8 and hypocone under binocular microscopes. As a result, the formation of lower facet 8 was found to be strictly indicative of the hypocone without being influenced by the lingual cingulum. Application of this relationship on such Platyrrhine fossils as Aotus dindensis, Mohanamico hershkovitzi, Patasola magdalena, Xenothrix mcgregori, Nuciruptor rubricae, whose upper molars were not found, and therefore, which have not been properly classified, gave phylogenetic implications.
    抄録全体を表示
    PDF形式でダウンロード (1658K)
短報
調査・技術報告
  • 房総半島に定着したアカゲザル集団におけるニホンザルとの交雑進行
    川本 芳, 川本 咲江, 川合 静, 白井 啓, 吉田 淳久, 萩原 光, 白鳥 大祐, 直井 洋司
    2007 年 23 巻 2 号 p. 81-89
    発行日: 2007/12/20
    公開日: 2009/03/13
    DOIhttps://doi.org/10.2354/psj.23.81
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    We examined a total of 20 blood samples for assessment of the degree of hybridization between introduced rhesus macaques and native Japanese macaques in the Bousou Peninsula. Each individual was characterized by different kinds of genetic markers (two protein loci, mtDNA and one Y chromosome DNA) in order to evaluate paternal and maternal origin and the degree of hybridization. The sample individuals contained one adult male Japanese macaque, and all others were rhesus or rhesus hybrid born in the study population. Of these 19 natal, at least 15 (78.9 per cent) were hybrids. The estimated frequencies of Japanese macaque genes were 0.342 and 0.857 for autosomal and Y chromosomal genes, respectively. This result revealed a high degree of hybridization in the introduced rhesus population. A test for random mating suggested that the two species were intermixing without reproductive defects. As the habitat of native Japanese macaque troops on the peninsula are very close, removal of the hybrid population is urgently required to prevent the transfer of their genes into the Japanese macaque population. It is also important to begin monitoring for further potential gene flow between rhesus and Japanese macaques in the peninsula.
    抄録全体を表示
    PDF形式でダウンロード (840K)
総説
  • サルを用いたメタ記憶の神経生理学的研究に向けて
    田中 暁生, 船橋 新太郎
    2007 年 23 巻 2 号 p. 91-105
    発行日: 2007/12/20
    公開日: 2009/03/13
    DOIhttps://doi.org/10.2354/psj.23.91
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Metamemory refers to the knowledge about one's own memory capabilities and mnemonic strategies that support efficient learning and memory, and/or to the awareness and recognition about on-going mnemonic processes as well as what is stored in memory. Psychological studies established experimental methods to investigate the accuracy of human metamnemonic judgments and demonstrated that humans were capable of monitoring their own memory accurately. Recently, a number of neuropsychological as well as neuroimaging studies have indicated that the prefrontal cortex plays a crucial role in metamemory. Meanwhile there have been growing interests in exploring metacognitive abilities in animals. These lines of studies have developed new experimental paradigms suitable for systematically investigating the capability of animals' metamemory. In this article, we first briefly review previous studies on metamemory in humans and animals. Based on the findings from these studies, we then discuss strategies for examining neuronal substrates of metamemory in monkeys through neurophysiological approaches.
    抄録全体を表示
    PDF形式でダウンロード (642K)
情報・話題
書評
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top